diff --git a/src/main/scala/api/ApiCombinedCommitStatus.scala b/src/main/scala/api/ApiCombinedCommitStatus.scala
new file mode 100644
index 0000000..29d8fa7
--- /dev/null
+++ b/src/main/scala/api/ApiCombinedCommitStatus.scala
@@ -0,0 +1,26 @@
+package api
+
+import model.Account
+import model.CommitStatus
+import model.CommitState
+
+/**
+ * https://developer.github.com/v3/repos/statuses/#get-the-combined-status-for-a-specific-ref
+ */
+case class ApiCombinedCommitStatus(
+  state: String,
+  sha: String,
+  total_count: Int,
+  statuses: Iterable[ApiCommitStatus],
+  repository: ApiRepository){
+  // val commit_url = ApiPath(s"/api/v3/repos/${repository.full_name}/${sha}")
+  val url = ApiPath(s"/api/v3/repos/${repository.full_name}/commits/${sha}/status")
+}
+object ApiCombinedCommitStatus {
+  def apply(sha:String, statuses: Iterable[(CommitStatus, Account)], repository:ApiRepository): ApiCombinedCommitStatus = ApiCombinedCommitStatus(
+    state      = CommitState.combine(statuses.map(_._1.state).toSet).name,
+    sha        = sha,
+    total_count= statuses.size,
+    statuses   = statuses.map{ case (s, a)=> ApiCommitStatus(s, ApiUser(a)) },
+    repository = repository)
+}
diff --git a/src/main/scala/api/ApiComment.scala b/src/main/scala/api/ApiComment.scala
new file mode 100644
index 0000000..1733fb3
--- /dev/null
+++ b/src/main/scala/api/ApiComment.scala
@@ -0,0 +1,24 @@
+package api
+
+import java.util.Date
+import model.IssueComment
+
+/**
+ * https://developer.github.com/v3/issues/comments/
+ */
+case class ApiComment(
+  id: Int,
+  user: ApiUser,
+  body: String,
+  created_at: Date,
+  updated_at: Date)
+
+object ApiComment{
+  def apply(comment: IssueComment, user: ApiUser): ApiComment =
+    ApiComment(
+      id = comment.commentId,
+      user = user,
+      body = comment.content,
+      created_at = comment.registeredDate,
+      updated_at = comment.updatedDate)
+}
diff --git a/src/main/scala/api/ApiCommit.scala b/src/main/scala/api/ApiCommit.scala
new file mode 100644
index 0000000..f4ef17a
--- /dev/null
+++ b/src/main/scala/api/ApiCommit.scala
@@ -0,0 +1,41 @@
+package api
+
+import java.util.Date
+import org.eclipse.jgit.diff.DiffEntry
+import util.JGitUtil
+import util.JGitUtil.CommitInfo
+import org.eclipse.jgit.api.Git
+import util.RepositoryName
+
+/**
+ * https://developer.github.com/v3/repos/commits/
+ */
+case class ApiCommit(
+  id: String,
+  message: String,
+  timestamp: Date,
+  added: List[String],
+  removed: List[String],
+  modified: List[String],
+  author: ApiPersonIdent,
+  committer: ApiPersonIdent)(repositoryName:RepositoryName){
+  val url = ApiPath(s"/api/v3/${repositoryName.fullName}/commits/${id}")
+  val html_url = ApiPath(s"/${repositoryName.fullName}/commit/${id}")
+}
+
+object ApiCommit{
+  def apply(git: Git, repositoryName: RepositoryName, commit: CommitInfo): ApiCommit = {
+    val diffs = JGitUtil.getDiffs(git, commit.id, false)
+    ApiCommit(
+      id        = commit.id,
+      message   = commit.fullMessage,
+      timestamp = commit.commitTime,
+      added     = diffs._1.collect { case x if(x.changeType == DiffEntry.ChangeType.ADD)    => x.newPath },
+      removed   = diffs._1.collect { case x if(x.changeType == DiffEntry.ChangeType.DELETE) => x.oldPath },
+      modified  = diffs._1.collect { case x if(x.changeType != DiffEntry.ChangeType.ADD &&
+        x.changeType != DiffEntry.ChangeType.DELETE) => x.newPath },
+      author    = ApiPersonIdent.author(commit),
+      committer = ApiPersonIdent.committer(commit)
+    )(repositoryName)
+  }
+}
diff --git a/src/main/scala/api/ApiCommitListItem.scala b/src/main/scala/api/ApiCommitListItem.scala
new file mode 100644
index 0000000..c345661
--- /dev/null
+++ b/src/main/scala/api/ApiCommitListItem.scala
@@ -0,0 +1,41 @@
+package api
+
+import util.JGitUtil.CommitInfo
+import ApiCommitListItem._
+import util.RepositoryName
+
+/**
+ * https://developer.github.com/v3/repos/commits/
+ */
+case class ApiCommitListItem(
+  sha: String,
+  commit: Commit,
+  author: Option[ApiUser],
+  committer: Option[ApiUser],
+  parents: Seq[Parent])(repositoryName: RepositoryName) {
+  val url = ApiPath(s"/api/v3/repos/${repositoryName.fullName}/commits/${sha}")
+}
+
+object ApiCommitListItem {
+  def apply(commit: CommitInfo, repositoryName: RepositoryName): ApiCommitListItem = ApiCommitListItem(
+    sha    = commit.id,
+    commit = Commit(
+      message   = commit.fullMessage,
+      author    = ApiPersonIdent.author(commit),
+      committer = ApiPersonIdent.committer(commit)
+      )(commit.id, repositoryName),
+    author    = None,
+    committer = None,
+    parents   = commit.parents.map(Parent(_)(repositoryName)))(repositoryName)
+
+  case class Parent(sha: String)(repositoryName: RepositoryName){
+    val url = ApiPath(s"/api/v3/repos/${repositoryName.fullName}/commits/${sha}")
+  }
+
+  case class Commit(
+    message: String,
+    author: ApiPersonIdent,
+    committer: ApiPersonIdent)(sha:String, repositoryName: RepositoryName) {
+    val url = ApiPath(s"/api/v3/repos/${repositoryName.fullName}/git/commits/${sha}")
+  }
+}
diff --git a/src/main/scala/api/ApiCommitStatus.scala b/src/main/scala/api/ApiCommitStatus.scala
new file mode 100644
index 0000000..e6e2ea1
--- /dev/null
+++ b/src/main/scala/api/ApiCommitStatus.scala
@@ -0,0 +1,35 @@
+package api
+
+import java.util.Date
+import model.CommitStatus
+import util.RepositoryName
+
+/**
+ * https://developer.github.com/v3/repos/statuses/#create-a-status
+ * https://developer.github.com/v3/repos/statuses/#list-statuses-for-a-specific-ref
+ */
+case class ApiCommitStatus(
+  created_at: Date,
+  updated_at: Date,
+  state: String,
+  target_url: Option[String],
+  description: Option[String],
+  id: Int,
+  context: String,
+  creator: ApiUser
+)(sha: String,repositoryName: RepositoryName) {
+  val url = ApiPath(s"/api/v3/repos/${repositoryName.fullName}/commits/${sha}/statuses")
+}
+
+object ApiCommitStatus {
+  def apply(status: CommitStatus, creator:ApiUser): ApiCommitStatus = ApiCommitStatus(
+    created_at = status.registeredDate,
+    updated_at = status.updatedDate,
+    state      = status.state.name,
+    target_url = status.targetUrl,
+    description= status.description,
+    id         = status.commitStatusId,
+    context    = status.context,
+    creator    = creator
+  )(status.commitId, RepositoryName(status))
+}
diff --git a/src/main/scala/api/ApiIssue.scala b/src/main/scala/api/ApiIssue.scala
new file mode 100644
index 0000000..6c31d6a
--- /dev/null
+++ b/src/main/scala/api/ApiIssue.scala
@@ -0,0 +1,29 @@
+package api
+
+import java.util.Date
+import model.Issue
+
+/**
+ * https://developer.github.com/v3/issues/
+ */
+case class ApiIssue(
+  number: Int,
+  title: String,
+  user: ApiUser,
+  // labels,
+  state: String,
+  created_at: Date,
+  updated_at: Date,
+  body: String)
+
+object ApiIssue{
+  def apply(issue: Issue, user: ApiUser): ApiIssue =
+    ApiIssue(
+      number = issue.issueId,
+      title  = issue.title,
+      user   = user,
+      state  = if(issue.closed){ "closed" }else{ "open" },
+      body   = issue.content.getOrElse(""),
+      created_at = issue.registeredDate,
+      updated_at = issue.updatedDate)
+}
diff --git a/src/main/scala/api/ApiPath.scala b/src/main/scala/api/ApiPath.scala
new file mode 100644
index 0000000..2572945
--- /dev/null
+++ b/src/main/scala/api/ApiPath.scala
@@ -0,0 +1,6 @@
+package api
+
+/**
+ * path for api url. if set path '/repos/aa/bb' then, expand 'http://server:post/repos/aa/bb' when converted to json.
+ */
+case class ApiPath(path: String)
diff --git a/src/main/scala/api/ApiPersonIdent.scala b/src/main/scala/api/ApiPersonIdent.scala
new file mode 100644
index 0000000..c9b3b97
--- /dev/null
+++ b/src/main/scala/api/ApiPersonIdent.scala
@@ -0,0 +1,22 @@
+package api
+
+import java.util.Date
+import util.JGitUtil.CommitInfo
+
+case class ApiPersonIdent(
+  name: String,
+  email: String,
+  date: Date)
+
+object ApiPersonIdent {
+  def author(commit: CommitInfo): ApiPersonIdent =
+    ApiPersonIdent(
+      name  = commit.authorName,
+      email = commit.authorEmailAddress,
+      date  = commit.authorTime)
+  def committer(commit: CommitInfo): ApiPersonIdent =
+    ApiPersonIdent(
+      name  = commit.committerName,
+      email = commit.committerEmailAddress,
+      date  = commit.commitTime)
+}
diff --git a/src/main/scala/api/ApiPullRequest.scala b/src/main/scala/api/ApiPullRequest.scala
new file mode 100644
index 0000000..975f562
--- /dev/null
+++ b/src/main/scala/api/ApiPullRequest.scala
@@ -0,0 +1,58 @@
+package api
+
+import java.util.Date
+import model.{Issue, PullRequest}
+import ApiPullRequest._
+
+/**
+ * https://developer.github.com/v3/pulls/
+ */
+case class ApiPullRequest(
+  number: Int,
+  updated_at: Date,
+  created_at: Date,
+  head: ApiPullRequest.Commit,
+  base: ApiPullRequest.Commit,
+  mergeable: Option[Boolean],
+  title: String,
+  body: String,
+  user: ApiUser) {
+  val html_url            = ApiPath(s"${base.repo.html_url.path}/pull/${number}")
+  //val diff_url            = ApiPath(s"${base.repo.html_url.path}/pull/${number}.diff")
+  //val patch_url           = ApiPath(s"${base.repo.html_url.path}/pull/${number}.patch")
+  val url                 = ApiPath(s"${base.repo.url.path}/pulls/${number}")
+  //val issue_url           = ApiPath(s"${base.repo.url.path}/issues/${number}")
+  val commits_url         = ApiPath(s"${base.repo.url.path}/pulls/${number}/commits")
+  val review_comments_url = ApiPath(s"${base.repo.url.path}/pulls/${number}/comments")
+  val review_comment_url  = ApiPath(s"${base.repo.url.path}/pulls/comments/{number}")
+  val comments_url        = ApiPath(s"${base.repo.url.path}/issues/${number}/comments")
+  val statuses_url        = ApiPath(s"${base.repo.url.path}/statuses/${head.sha}")
+}
+
+object ApiPullRequest{
+  def apply(issue: Issue, pullRequest: PullRequest, headRepo: ApiRepository, baseRepo: ApiRepository, user: ApiUser): ApiPullRequest = ApiPullRequest(
+      number     = issue.issueId,
+      updated_at = issue.updatedDate,
+      created_at = issue.registeredDate,
+      head       = Commit(
+                     sha  = pullRequest.commitIdTo,
+                     ref  = pullRequest.requestBranch,
+                     repo = headRepo)(issue.userName),
+      base       = Commit(
+                     sha  = pullRequest.commitIdFrom,
+                     ref  = pullRequest.branch,
+                     repo = baseRepo)(issue.userName),
+      mergeable  = None, // TODO: need check mergeable.
+      title      = issue.title,
+      body       = issue.content.getOrElse(""),
+      user       = user
+    )
+
+  case class Commit(
+    sha: String,
+    ref: String,
+    repo: ApiRepository)(baseOwner:String){
+    val label = if( baseOwner == repo.owner.login ){ ref }else{ s"${repo.owner.login}:${ref}" }
+    val user = repo.owner
+  }
+}
diff --git a/src/main/scala/api/ApiRepository.scala b/src/main/scala/api/ApiRepository.scala
new file mode 100644
index 0000000..05949b8
--- /dev/null
+++ b/src/main/scala/api/ApiRepository.scala
@@ -0,0 +1,48 @@
+package api
+
+import util.JGitUtil.CommitInfo
+import service.RepositoryService.RepositoryInfo
+import model.{Account, Repository}
+
+// https://developer.github.com/v3/repos/
+case class ApiRepository(
+  name: String,
+  full_name: String,
+  description: String,
+  watchers: Int,
+  forks: Int,
+  `private`: Boolean,
+  default_branch: String,
+  owner: ApiUser) {
+  val forks_count   = forks
+  val watchers_coun = watchers
+  val url       = ApiPath(s"/api/v3/repos/${full_name}")
+  val http_url  = ApiPath(s"/git/${full_name}.git")
+  val clone_url = ApiPath(s"/git/${full_name}.git")
+  val html_url  = ApiPath(s"/${full_name}")
+}
+
+object ApiRepository{
+  def apply(
+      repository: Repository,
+      owner: ApiUser,
+      forkedCount: Int =0,
+      watchers: Int = 0): ApiRepository =
+    ApiRepository(
+      name        = repository.repositoryName,
+      full_name   = s"${repository.userName}/${repository.repositoryName}",
+      description = repository.description.getOrElse(""),
+      watchers    = 0,
+      forks       = forkedCount,
+      `private`   = repository.isPrivate,
+      default_branch = repository.defaultBranch,
+      owner       = owner
+    )
+
+  def apply(repositoryInfo: RepositoryInfo, owner: ApiUser): ApiRepository =
+    ApiRepository(repositoryInfo.repository, owner, forkedCount=repositoryInfo.forkedCount)
+
+  def apply(repositoryInfo: RepositoryInfo, owner: Account): ApiRepository =
+    this(repositoryInfo.repository, ApiUser(owner))
+
+}
diff --git a/src/main/scala/api/ApiUser.scala b/src/main/scala/api/ApiUser.scala
new file mode 100644
index 0000000..5cbc326
--- /dev/null
+++ b/src/main/scala/api/ApiUser.scala
@@ -0,0 +1,33 @@
+package api
+
+import java.util.Date
+import model.Account
+
+case class ApiUser(
+  login: String,
+  email: String,
+  `type`: String,
+  site_admin: Boolean,
+  created_at: Date) {
+  val url                 = ApiPath(s"/api/v3/users/${login}")
+  val html_url            = ApiPath(s"/${login}")
+  // val followers_url       = ApiPath(s"/api/v3/users/${login}/followers")
+  // val following_url       = ApiPath(s"/api/v3/users/${login}/following{/other_user}")
+  // val gists_url           = ApiPath(s"/api/v3/users/${login}/gists{/gist_id}")
+  // val starred_url         = ApiPath(s"/api/v3/users/${login}/starred{/owner}{/repo}")
+  // val subscriptions_url   = ApiPath(s"/api/v3/users/${login}/subscriptions")
+  // val organizations_url   = ApiPath(s"/api/v3/users/${login}/orgs")
+  // val repos_url           = ApiPath(s"/api/v3/users/${login}/repos")
+  // val events_url          = ApiPath(s"/api/v3/users/${login}/events{/privacy}")
+  // val received_events_url = ApiPath(s"/api/v3/users/${login}/received_events")
+}
+
+object ApiUser{
+  def apply(user: Account): ApiUser = ApiUser(
+    login      = user.fullName,
+    email      = user.mailAddress,
+    `type`     = if(user.isGroupAccount){ "Organization" }else{ "User" },
+    site_admin = user.isAdmin,
+    created_at = user.registeredDate
+  )
+}
diff --git a/src/main/scala/api/CreateAComment.scala b/src/main/scala/api/CreateAComment.scala
new file mode 100644
index 0000000..733758d
--- /dev/null
+++ b/src/main/scala/api/CreateAComment.scala
@@ -0,0 +1,7 @@
+package api
+
+/**
+ * https://developer.github.com/v3/issues/comments/#create-a-comment
+ * api form
+ */
+case class CreateAComment(body: String)
diff --git a/src/main/scala/api/CreateAStatus.scala b/src/main/scala/api/CreateAStatus.scala
new file mode 100644
index 0000000..5237cac
--- /dev/null
+++ b/src/main/scala/api/CreateAStatus.scala
@@ -0,0 +1,26 @@
+package api
+
+import model.CommitState
+
+/**
+ * https://developer.github.com/v3/repos/statuses/#create-a-status
+ * api form
+ */
+case class CreateAStatus(
+  /* state is Required. The state of the status. Can be one of pending, success, error, or failure. */
+  state: String,
+  /* context is a string label to differentiate this status from the status of other systems. Default: "default" */
+  context: Option[String],
+  /* The target URL to associate with this status. This URL will be linked from the GitHub UI to allow users to easily see the ‘source’ of the Status. */
+  target_url: Option[String],
+  /* description is a short description of the status.*/
+  description: Option[String]
+) {
+  def isValid: Boolean = {
+    CommitState.valueOf(state).isDefined &&
+      // only http
+      target_url.filterNot(f => "\\Ahttps?://".r.findPrefixOf(f).isDefined && f.length<255).isEmpty &&
+      context.filterNot(f => f.length<255).isEmpty &&
+      description.filterNot(f => f.length<1000).isEmpty
+  }
+}
diff --git a/src/main/scala/api/JsonFormat.scala b/src/main/scala/api/JsonFormat.scala
new file mode 100644
index 0000000..f743534
--- /dev/null
+++ b/src/main/scala/api/JsonFormat.scala
@@ -0,0 +1,37 @@
+package api
+import org.json4s._
+import org.json4s.jackson.Serialization
+import scala.util.Try
+import org.joda.time.format._
+import org.joda.time.DateTime
+import org.joda.time.DateTimeZone
+import java.util.Date
+object JsonFormat {
+  case class Context(baseUrl:String)
+  val parserISO = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss'Z'")
+  val jsonFormats = Serialization.formats(NoTypeHints) + new CustomSerializer[Date](format =>
+    (
+      { case JString(s) => Try(parserISO.parseDateTime(s)).toOption.map(_.toDate)
+        .getOrElse(throw new MappingException("Can't convert " + s + " to Date")) },
+      { case x: Date => JString(parserISO.print(new DateTime(x).withZone(DateTimeZone.UTC))) }
+    )
+  ) + FieldSerializer[ApiUser]() + FieldSerializer[ApiPullRequest]() + FieldSerializer[ApiRepository]() +
+    FieldSerializer[ApiCommitListItem.Parent]() + FieldSerializer[ApiCommitListItem]() + FieldSerializer[ApiCommitListItem.Commit]() +
+    FieldSerializer[ApiCommitStatus]() + FieldSerializer[ApiCommit]() + FieldSerializer[ApiCombinedCommitStatus]() +
+    FieldSerializer[ApiPullRequest.Commit]()
+  def apiPathSerializer(c: Context) = new CustomSerializer[ApiPath](format =>
+      (
+        {
+          case JString(s) if s.startsWith(c.baseUrl) => ApiPath(s.substring(c.baseUrl.length))
+          case JString(s) => throw new MappingException("Can't convert " + s + " to ApiPath")
+        },
+        {
+          case ApiPath(path) => JString(c.baseUrl+path)
+        }
+      )
+    )
+  /**
+   * convert object to json string
+   */
+  def apply(obj: AnyRef)(implicit c: Context): String = Serialization.write(obj)(jsonFormats + apiPathSerializer(c))
+}
diff --git a/src/main/scala/app/AccountController.scala b/src/main/scala/app/AccountController.scala
index c0b3c89..53f353a 100644
--- a/src/main/scala/app/AccountController.scala
+++ b/src/main/scala/app/AccountController.scala
@@ -15,6 +15,7 @@
 import org.eclipse.jgit.dircache.DirCache
 import model.GroupMember
 import service.WebHookService._
+import api._
 
 class AccountController extends AccountControllerBase
   with AccountService with RepositoryService with ActivityService with WikiService with LabelsService with SshKeyService
@@ -156,7 +157,7 @@
    */
   get("/api/v3/users/:userName") {
     getAccountByUserName(params("userName")).map { account =>
-      apiJson(WebHookApiUser(account))
+      JsonFormat(ApiUser(account))
     } getOrElse NotFound
   }
 
@@ -165,7 +166,7 @@
    */
   get("/api/v3/user") {
     context.loginAccount.map { account =>
-      apiJson(WebHookApiUser(account))
+      JsonFormat(ApiUser(account))
     } getOrElse NotFound
   }
 
diff --git a/src/main/scala/app/IssuesController.scala b/src/main/scala/app/IssuesController.scala
index 077652e..43e24f4 100644
--- a/src/main/scala/app/IssuesController.scala
+++ b/src/main/scala/app/IssuesController.scala
@@ -11,6 +11,7 @@
 import model.Issue
 import service.WebHookService._
 import scala.util.Try
+import api._
 
 class IssuesController extends IssuesControllerBase
   with IssuesService with RepositoryService with AccountService with LabelsService with MilestonesService with ActivityService
@@ -83,7 +84,7 @@
       issueId <- params("id").toIntOpt
       comments = getCommentsForApi(repository.owner, repository.name, issueId.toInt)
     } yield {
-      apiJson(comments.map{ case (issueComment, user) => WebHookComment(issueComment, WebHookApiUser(user)) })
+      JsonFormat(comments.map{ case (issueComment, user) => ApiComment(issueComment, ApiUser(user)) })
     }).getOrElse(NotFound)
   })
 
@@ -187,7 +188,7 @@
       (issue, id) <- handleComment(issueId, Some(body), repository)()
       issueComment <- getComment(repository.owner, repository.name, id.toString())
     } yield {
-      apiJson(WebHookComment(issueComment, WebHookApiUser(context.loginAccount.get)))
+      JsonFormat(ApiComment(issueComment, ApiUser(context.loginAccount.get)))
     }) getOrElse NotFound
   })
 
diff --git a/src/main/scala/app/PullRequestsController.scala b/src/main/scala/app/PullRequestsController.scala
index a946ee4..f3c8cba 100644
--- a/src/main/scala/app/PullRequestsController.scala
+++ b/src/main/scala/app/PullRequestsController.scala
@@ -19,7 +19,7 @@
 import util.JGitUtil.DiffInfo
 import util.JGitUtil.CommitInfo
 import model.{PullRequest, Issue, CommitState}
-
+import api._
 
 class PullRequestsController extends PullRequestsControllerBase
   with RepositoryService with AccountService with IssuesService with PullRequestService with MilestonesService with LabelsService
@@ -80,13 +80,13 @@
     val condition = IssueSearchCondition(request)
     val baseOwner = getAccountByUserName(repository.owner).get
     val issues:List[(model.Issue, model.Account, Int, model.PullRequest, model.Repository, model.Account)] = searchPullRequestByApi(condition, (page - 1) * PullRequestLimit, PullRequestLimit, repository.owner -> repository.name)
-    apiJson(issues.map{case (issue, issueUser, commentCount, pullRequest, headRepo, headOwner) =>
-      WebHookPullRequest(
+    JsonFormat(issues.map{case (issue, issueUser, commentCount, pullRequest, headRepo, headOwner) =>
+      ApiPullRequest(
         issue,
         pullRequest,
-        WebHookRepository(headRepo, WebHookApiUser(headOwner)),
-        WebHookRepository(repository, WebHookApiUser(baseOwner)),
-        WebHookApiUser(issueUser)) })
+        ApiRepository(headRepo, ApiUser(headOwner)),
+        ApiRepository(repository, ApiUser(baseOwner)),
+        ApiUser(issueUser)) })
   })
 
   get("/:owner/:repository/pull/:id")(referrersOnly { repository =>
@@ -127,12 +127,12 @@
       issueUser <- users.get(issue.userName)
       headRepo  <- getRepository(pullRequest.requestUserName, pullRequest.requestRepositoryName, baseUrl)
     } yield {
-      apiJson(WebHookPullRequest(
+      JsonFormat(ApiPullRequest(
         issue,
         pullRequest,
-        WebHookRepository(headRepo, WebHookApiUser(headOwner)),
-        WebHookRepository(repository, WebHookApiUser(baseOwner)),
-        WebHookApiUser(issueUser)))
+        ApiRepository(headRepo, ApiUser(headOwner)),
+        ApiRepository(repository, ApiUser(baseOwner)),
+        ApiUser(issueUser)))
     }).getOrElse(NotFound)
   })
 
@@ -147,9 +147,9 @@
         using(Git.open(getRepositoryDir(owner, name))){ git =>
           val oldId = git.getRepository.resolve(pullreq.commitIdFrom)
           val newId = git.getRepository.resolve(pullreq.commitIdTo)
-          val repoFullName = s"${owner}/${name}"
-          val commits = git.log.addRange(oldId, newId).call.iterator.asScala.map(c => WebHookCommitListItem(new CommitInfo(c), repoFullName)).toList
-          apiJson(commits)
+          val repoFullName = util.RepositoryName(repository)
+          val commits = git.log.addRange(oldId, newId).call.iterator.asScala.map(c => ApiCommitListItem(new CommitInfo(c), repoFullName)).toList
+          JsonFormat(commits)
         }
       }
     } getOrElse NotFound
diff --git a/src/main/scala/app/RepositoryViewerController.scala b/src/main/scala/app/RepositoryViewerController.scala
index 3ec28e3..e710d06 100644
--- a/src/main/scala/app/RepositoryViewerController.scala
+++ b/src/main/scala/app/RepositoryViewerController.scala
@@ -19,6 +19,7 @@
 import org.eclipse.jgit.revwalk.RevCommit
 import service.WebHookService._
 import model.CommitState
+import api._
 
 class RepositoryViewerController extends RepositoryViewerControllerBase
   with RepositoryService with AccountService with ActivityService with IssuesService with WebHookService with CommitsService
@@ -110,7 +111,7 @@
    * https://developer.github.com/v3/repos/#get
    */
   get("/api/v3/repos/:owner/:repository")(referrersOnly { repository =>
-    apiJson(WebHookRepository(repository, WebHookApiUser(getAccountByUserName(repository.owner).get)))
+    JsonFormat(ApiRepository(repository, ApiUser(getAccountByUserName(repository.owner).get)))
   })
 
   /**
@@ -158,7 +159,7 @@
                                     state, data.target_url, data.description, new java.util.Date(), creator)
       status <- getCommitStatus(repository.owner, repository.name, statusId)
     } yield {
-      apiJson(WebHookCommitStatus(status, WebHookApiUser(creator)))
+      JsonFormat(ApiCommitStatus(status, ApiUser(creator)))
     }) getOrElse NotFound
   })
 
@@ -172,8 +173,8 @@
       ref <- params.get("ref")
       sha <- JGitUtil.getShaByRef(repository.owner, repository.name, ref)
     } yield {
-      apiJson(getCommitStatuesWithCreator(repository.owner, repository.name, sha).map{ case(status, creator) =>
-        WebHookCommitStatus(status, WebHookApiUser(creator))
+      JsonFormat(getCommitStatuesWithCreator(repository.owner, repository.name, sha).map{ case(status, creator) =>
+        ApiCommitStatus(status, ApiUser(creator))
       })
     }) getOrElse NotFound
   })
@@ -190,7 +191,7 @@
       sha <- JGitUtil.getShaByRef(repository.owner, repository.name, ref)
     } yield {
       val statuses = getCommitStatuesWithCreator(repository.owner, repository.name, sha)
-      apiJson(WebHookCombinedCommitStatus(sha, statuses, WebHookRepository(repository, owner)))
+      JsonFormat(ApiCombinedCommitStatus(sha, statuses, ApiRepository(repository, owner)))
     }) getOrElse NotFound
   })
 
diff --git a/src/main/scala/service/RepositoryService.scala b/src/main/scala/service/RepositoryService.scala
index bae3a71..34ece5b 100644
--- a/src/main/scala/service/RepositoryService.scala
+++ b/src/main/scala/service/RepositoryService.scala
@@ -397,5 +397,4 @@
   }
 
   case class RepositoryTreeNode(owner: String, name: String, children: List[RepositoryTreeNode])
-
 }
diff --git a/src/main/scala/service/WebHookService.scala b/src/main/scala/service/WebHookService.scala
index 25dae0b..c03ce95 100644
--- a/src/main/scala/service/WebHookService.scala
+++ b/src/main/scala/service/WebHookService.scala
@@ -6,13 +6,13 @@
 import org.slf4j.LoggerFactory
 import service.RepositoryService.RepositoryInfo
 import util.JGitUtil
-import org.eclipse.jgit.diff.DiffEntry
 import util.JGitUtil.CommitInfo
 import org.eclipse.jgit.api.Git
 import org.apache.http.message.BasicNameValuePair
 import org.apache.http.client.entity.UrlEncodedFormEntity
 import org.apache.http.NameValuePair
 import java.util.Date
+import api._
 
 trait WebHookService {
   import WebHookService._
@@ -28,25 +28,21 @@
   def deleteWebHookURL(owner: String, repository: String, url :String)(implicit s: Session): Unit =
     WebHooks.filter(_.byPrimaryKey(owner, repository, url)).delete
 
-  def callWebHookOf(owner: String, repository: String, eventName: String)(makePayload: => Option[WebHookPayload])(implicit s: Session, c: ApiContext): Unit = {
+  def callWebHookOf(owner: String, repository: String, eventName: String)(makePayload: => Option[WebHookPayload])(implicit s: Session, c: JsonFormat.Context): Unit = {
     val webHookURLs = getWebHookURLs(owner, repository)
     if(webHookURLs.nonEmpty){
       makePayload.map(callWebHook(eventName, webHookURLs, _))
     }
   }
 
-  def apiJson(obj: AnyRef)(implicit c: ApiContext): String = {
-    org.json4s.jackson.Serialization.write(obj)(jsonFormats + apiPathSerializer(c))
-  }
-
-  def callWebHook(eventName: String, webHookURLs: List[WebHook], payload: WebHookPayload)(implicit c: ApiContext): Unit = {
+  def callWebHook(eventName: String, webHookURLs: List[WebHook], payload: WebHookPayload)(implicit c: JsonFormat.Context): Unit = {
     import org.apache.http.client.methods.HttpPost
     import org.apache.http.impl.client.HttpClientBuilder
     import scala.concurrent._
     import ExecutionContext.Implicits.global
 
     if(webHookURLs.nonEmpty){
-      val json = apiJson(payload)
+      val json = JsonFormat(payload)
       val httpClient = HttpClientBuilder.create.build
 
       webHookURLs.foreach { webHookUrl =>
@@ -81,7 +77,7 @@
 
   import WebHookService._
   // https://developer.github.com/v3/activity/events/types/#issuesevent
-  def callIssuesWebHook(action: String, repository: RepositoryService.RepositoryInfo, issue: Issue, baseUrl: String, sender: model.Account)(implicit s: Session, context:ApiContext): Unit = {
+  def callIssuesWebHook(action: String, repository: RepositoryService.RepositoryInfo, issue: Issue, baseUrl: String, sender: model.Account)(implicit s: Session, context:JsonFormat.Context): Unit = {
     callWebHookOf(repository.owner, repository.name, "issues"){
       val users = getAccountsByUserNames(Set(repository.owner, issue.userName), Set(sender))
       for{
@@ -91,14 +87,14 @@
         WebHookIssuesPayload(
           action       = action,
           number       = issue.issueId,
-          repository   = WebHookRepository(repository, WebHookApiUser(repoOwner)),
-          issue        = WebHookIssue(issue, WebHookApiUser(issueUser)),
-          sender       = WebHookApiUser(sender))
+          repository   = ApiRepository(repository, ApiUser(repoOwner)),
+          issue        = ApiIssue(issue, ApiUser(issueUser)),
+          sender       = ApiUser(sender))
       }
     }
   }
 
-  def callPullRequestWebHook(action: String, repository: RepositoryService.RepositoryInfo, issueId: Int, baseUrl: String, sender: model.Account)(implicit s: Session, context:ApiContext): Unit = {
+  def callPullRequestWebHook(action: String, repository: RepositoryService.RepositoryInfo, issueId: Int, baseUrl: String, sender: model.Account)(implicit s: Session, context:JsonFormat.Context): Unit = {
     import WebHookService._
     callWebHookOf(repository.owner, repository.name, "pull_request"){
       for{
@@ -126,7 +122,7 @@
   self: AccountService with RepositoryService with PullRequestService with IssuesService =>
 
   import WebHookService._
-  def callIssueCommentWebHook(repository: RepositoryService.RepositoryInfo, issue: Issue, issueCommentId: Int, sender: model.Account)(implicit s: Session, context:ApiContext): Unit = {
+  def callIssueCommentWebHook(repository: RepositoryService.RepositoryInfo, issue: Issue, issueCommentId: Int, sender: model.Account)(implicit s: Session, context:JsonFormat.Context): Unit = {
     callWebHookOf(repository.owner, repository.name, "issue_comment"){
       for{
         issueComment <- getComment(repository.owner, repository.name, issueCommentId.toString())
@@ -149,58 +145,26 @@
 }
 
 object WebHookService {
-  case class ApiContext(baseUrl:String)
-
-  case class ApiPath(path:String)
-
-  import org.json4s._
-  import org.json4s.jackson.Serialization
-  val jsonFormats = {
-    import scala.util.Try
-    import org.joda.time.format._
-    import org.joda.time.DateTime
-    import org.joda.time.DateTimeZone
-    val parserISO = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss'Z'")
-    Serialization.formats(NoTypeHints) + new CustomSerializer[Date](format =>
-      (
-        { case JString(s) => Try(parserISO.parseDateTime(s)).toOption.map(_.toDate)
-          .getOrElse(throw new MappingException("Can't convert " + s + " to Date")) },
-        { case x: Date => JString(parserISO.print(new DateTime(x).withZone(DateTimeZone.UTC))) }
-      )
-    ) + FieldSerializer[WebHookApiUser]() + FieldSerializer[WebHookPullRequest]() + FieldSerializer[WebHookRepository]() +
-      FieldSerializer[WebHookCommitListItemParent]() + FieldSerializer[WebHookCommitListItem]() + FieldSerializer[WebHookCommitListItemCommit]() +
-      FieldSerializer[WebHookCommitStatus]() + FieldSerializer[WebHookCombinedCommitStatus]()
-  }
-  def apiPathSerializer(c:ApiContext) = new CustomSerializer[ApiPath](format =>
-      (
-        {
-          case JString(s) if s.startsWith(c.baseUrl) => ApiPath(s.substring(c.baseUrl.length))
-          case JString(s) => throw new MappingException("Can't convert " + s + " to ApiPath")
-        },
-        { case ApiPath(path) => JString(c.baseUrl+path) }
-      )
-    )
-
   trait WebHookPayload
 
   // https://developer.github.com/v3/activity/events/types/#pushevent
   case class WebHookPushPayload(
-    pusher: WebHookApiUser,
+    pusher: ApiUser,
     ref: String,
-    commits: List[WebHookCommit],
-    repository: WebHookRepository
+    commits: List[ApiCommit],
+    repository: ApiRepository
   ) extends WebHookPayload
 
   object WebHookPushPayload {
     def apply(git: Git, pusher: Account, refName: String, repositoryInfo: RepositoryInfo,
               commits: List[CommitInfo], repositoryOwner: Account): WebHookPushPayload =
       WebHookPushPayload(
-        WebHookApiUser(pusher),
+        ApiUser(pusher),
         refName,
-        commits.map{ commit => WebHookCommit(git, repositoryInfo, commit) },
-        WebHookRepository(
+        commits.map{ commit => ApiCommit(git, util.RepositoryName(repositoryInfo), commit) },
+        ApiRepository(
           repositoryInfo,
-          owner= WebHookApiUser(repositoryOwner)
+          owner= ApiUser(repositoryOwner)
         )
       )
   }
@@ -209,17 +173,17 @@
   case class WebHookIssuesPayload(
     action: String,
     number: Int,
-    repository: WebHookRepository,
-    issue: WebHookIssue,
-    sender: WebHookApiUser) extends WebHookPayload
+    repository: ApiRepository,
+    issue: ApiIssue,
+    sender: ApiUser) extends WebHookPayload
 
   // https://developer.github.com/v3/activity/events/types/#pullrequestevent
   case class WebHookPullRequestPayload(
     action: String,
     number: Int,
-    repository: WebHookRepository,
-    pull_request: WebHookPullRequest,
-    sender: WebHookApiUser
+    repository: ApiRepository,
+    pull_request: ApiPullRequest,
+    sender: ApiUser
   ) extends WebHookPayload
 
   object WebHookPullRequestPayload{
@@ -231,10 +195,10 @@
         baseRepository: RepositoryInfo,
         baseOwner: Account,
         sender: model.Account): WebHookPullRequestPayload = {
-      val headRepoPayload = WebHookRepository(headRepository, headOwner)
-      val baseRepoPayload = WebHookRepository(baseRepository, baseOwner)
-      val senderPayload = WebHookApiUser(sender)
-      val pr = WebHookPullRequest(issue, pullRequest, headRepoPayload, baseRepoPayload, senderPayload)
+      val headRepoPayload = ApiRepository(headRepository, headOwner)
+      val baseRepoPayload = ApiRepository(baseRepository, baseOwner)
+      val senderPayload = ApiUser(sender)
+      val pr = ApiPullRequest(issue, pullRequest, headRepoPayload, baseRepoPayload, senderPayload)
       WebHookPullRequestPayload(
         action       = action,
         number       = issue.issueId,
@@ -248,10 +212,10 @@
   // https://developer.github.com/v3/activity/events/types/#issuecommentevent
   case class WebHookIssueCommentPayload(
     action: String,
-    repository: WebHookRepository,
-    issue: WebHookIssue,
-    comment: WebHookComment,
-    sender: WebHookApiUser
+    repository: ApiRepository,
+    issue: ApiIssue,
+    comment: ApiComment,
+    sender: ApiUser
   ) extends WebHookPayload
 
   object WebHookIssueCommentPayload{
@@ -265,341 +229,9 @@
         sender: Account): WebHookIssueCommentPayload =
       WebHookIssueCommentPayload(
         action       = "created",
-        repository   = WebHookRepository(repository, repositoryUser),
-        issue        = WebHookIssue(issue, WebHookApiUser(issueUser)),
-        comment      = WebHookComment(comment, WebHookApiUser(commentUser)),
-        sender       = WebHookApiUser(sender))
-  }
-
-  case class WebHookCommit(
-    id: String,
-    message: String,
-    timestamp: Date,
-    url: String,
-    added: List[String],
-    removed: List[String],
-    modified: List[String],
-    author: WebHookCommitUser,
-    committer: WebHookCommitUser)
-
-  object WebHookCommit{
-    def apply(git: Git, repositoryInfo: RepositoryInfo, commit: CommitInfo): WebHookCommit = {
-      val diffs = JGitUtil.getDiffs(git, commit.id, false)
-      val commitUrl = repositoryInfo.httpUrl.replaceFirst("/git/", "/").stripSuffix(".git") + "/commit/" + commit.id
-      WebHookCommit(
-        id        = commit.id,
-        message   = commit.fullMessage,
-        timestamp = commit.commitTime,
-        url       = commitUrl,
-        added     = diffs._1.collect { case x if(x.changeType == DiffEntry.ChangeType.ADD)    => x.newPath },
-        removed   = diffs._1.collect { case x if(x.changeType == DiffEntry.ChangeType.DELETE) => x.oldPath },
-        modified  = diffs._1.collect { case x if(x.changeType != DiffEntry.ChangeType.ADD &&
-          x.changeType != DiffEntry.ChangeType.DELETE) => x.newPath },
-        author    = WebHookCommitUser.author(commit),
-        committer = WebHookCommitUser.committer(commit)
-      )
-    }
-  }
-
-  case class WebHookApiUser(
-    login: String,
-    email: String,
-    `type`: String,
-    site_admin: Boolean,
-    created_at: Date) {
-    val url                 = ApiPath(s"/api/v3/users/${login}")
-    val html_url            = ApiPath(s"/${login}")
-    // val followers_url       = ApiPath(s"/api/v3/users/${login}/followers")
-    // val following_url       = ApiPath(s"/api/v3/users/${login}/following{/other_user}")
-    // val gists_url           = ApiPath(s"/api/v3/users/${login}/gists{/gist_id}")
-    // val starred_url         = ApiPath(s"/api/v3/users/${login}/starred{/owner}{/repo}")
-    // val subscriptions_url   = ApiPath(s"/api/v3/users/${login}/subscriptions")
-    // val organizations_url   = ApiPath(s"/api/v3/users/${login}/orgs")
-    // val repos_url           = ApiPath(s"/api/v3/users/${login}/repos")
-    // val events_url          = ApiPath(s"/api/v3/users/${login}/events{/privacy}")
-    // val received_events_url = ApiPath(s"/api/v3/users/${login}/received_events")
-  }
-
-  object WebHookApiUser{
-    def apply(user: Account): WebHookApiUser = WebHookApiUser(
-      login      = user.fullName,
-      email      = user.mailAddress,
-      `type`     = if(user.isGroupAccount){ "Organization" }else{ "User" },
-      site_admin = user.isAdmin,
-      created_at = user.registeredDate
-    )
-  }
-
-  case class WebHookCommitUser(
-    name: String,
-    email: String,
-    date: Date)
-
-  object WebHookCommitUser {
-    def author(commit: CommitInfo): WebHookCommitUser =
-      WebHookCommitUser(
-        name  = commit.authorName,
-        email = commit.authorEmailAddress,
-        date  = commit.authorTime)
-    def committer(commit: CommitInfo): WebHookCommitUser =
-      WebHookCommitUser(
-        name  = commit.committerName,
-        email = commit.committerEmailAddress,
-        date  = commit.commitTime)
-  }
-
-  // https://developer.github.com/v3/repos/
-  case class WebHookRepository(
-    name: String,
-    full_name: String,
-    description: String,
-    watchers: Int,
-    forks: Int,
-    `private`: Boolean,
-    default_branch: String,
-    owner: WebHookApiUser) {
-    val forks_count   = forks
-    val watchers_coun = watchers
-    val url       = ApiPath(s"/api/v3/repos/${full_name}")
-    val http_url  = ApiPath(s"/git/${full_name}.git")
-    val clone_url = ApiPath(s"/git/${full_name}.git")
-    val html_url  = ApiPath(s"/${full_name}")
-  }
-
-  object WebHookRepository{
-    def apply(
-        repository: Repository,
-        owner: WebHookApiUser,
-        forkedCount: Int =0,
-        watchers: Int = 0): WebHookRepository =
-      WebHookRepository(
-        name        = repository.repositoryName,
-        full_name   = s"${repository.userName}/${repository.repositoryName}",
-        description = repository.description.getOrElse(""),
-        watchers    = 0,
-        forks       = forkedCount,
-        `private`   = repository.isPrivate,
-        default_branch = repository.defaultBranch,
-        owner       = owner
-      )
-
-    def apply(repositoryInfo: RepositoryInfo, owner: WebHookApiUser): WebHookRepository =
-      WebHookRepository(repositoryInfo.repository, owner, forkedCount=repositoryInfo.forkedCount)
-
-    def apply(repositoryInfo: RepositoryInfo, owner: Account): WebHookRepository =
-      this(repositoryInfo.repository, WebHookApiUser(owner))
-
-  }
-
-  // https://developer.github.com/v3/pulls/
-  case class WebHookPullRequest(
-    number: Int,
-    updated_at: Date,
-    created_at: Date,
-    head: WebHookPullRequestCommit,
-    base: WebHookPullRequestCommit,
-    mergeable: Option[Boolean],
-    title: String,
-    body: String,
-    user: WebHookApiUser) {
-    val html_url            = ApiPath(s"${base.repo.html_url.path}/pull/${number}")
-    //val diff_url            = ApiPath("${base.repo.html_url.path}/pull/${number}.diff")
-    //val patch_url           = ApiPath("${base.repo.html_url.path}/pull/${number}.patch")
-    val url                 = ApiPath(s"${base.repo.url.path}/pulls/${number}")
-    //val issue_url           = ApiPath("${base.repo.url.path}/issues/${number}")
-    //val commits_url         = ApiPath("${base.repo.url.path}/pulls/${number}/commits")
-    //val review_comments_url = ApiPath("${base.repo.url.path}/pulls/${number}/comments")
-    //val review_comment_url  = ApiPath("${base.repo.url.path}/pulls/comments/{number}")
-    //val comments_url        = ApiPath("${base.repo.url.path}/issues/${number}/comments")
-    val statuses_url        = ApiPath(s"${base.repo.url.path}/statuses/${head.sha}")
-  }
-
-  object WebHookPullRequest{
-    def apply(issue: Issue, pullRequest: PullRequest, headRepo: WebHookRepository, baseRepo: WebHookRepository, user: WebHookApiUser): WebHookPullRequest = WebHookPullRequest(
-        number     = issue.issueId,
-        updated_at = issue.updatedDate,
-        created_at = issue.registeredDate,
-        head       = WebHookPullRequestCommit(
-                       sha  = pullRequest.commitIdTo,
-                       ref  = pullRequest.requestBranch,
-                       repo = headRepo),
-        base       = WebHookPullRequestCommit(
-                       sha  = pullRequest.commitIdFrom,
-                       ref  = pullRequest.branch,
-                       repo = baseRepo),
-        mergeable  = None, // TODO: need check mergeable.
-        title      = issue.title,
-        body       = issue.content.getOrElse(""),
-        user       = user
-      )
-  }
-
-  case class WebHookPullRequestCommit(
-    label: String,
-    sha: String,
-    ref: String,
-    repo: WebHookRepository,
-    user: WebHookApiUser)
-
-  object WebHookPullRequestCommit{
-    def apply(sha: String,
-        ref: String,
-        repo: WebHookRepository): WebHookPullRequestCommit =
-          WebHookPullRequestCommit(
-            label = s"${repo.owner.login}:${ref}",
-            sha   = sha,
-            ref   = ref,
-            repo  = repo,
-            user  = repo.owner)
-  }
-
-  // https://developer.github.com/v3/issues/
-  case class WebHookIssue(
-    number: Int,
-    title: String,
-    user: WebHookApiUser,
-    // labels,
-    state: String,
-    created_at: Date,
-    updated_at: Date,
-    body: String)
-
-  object WebHookIssue{
-    def apply(issue: Issue, user: WebHookApiUser): WebHookIssue =
-      WebHookIssue(
-        number = issue.issueId,
-        title  = issue.title,
-        user   = user,
-        state  = if(issue.closed){ "closed" }else{ "open" },
-        body   = issue.content.getOrElse(""),
-        created_at = issue.registeredDate,
-        updated_at = issue.updatedDate)
-  }
-
-  // https://developer.github.com/v3/issues/comments/
-  case class WebHookComment(
-    id: Int,
-    user: WebHookApiUser,
-    body: String,
-    created_at: Date,
-    updated_at: Date)
-
-  object WebHookComment{
-    def apply(comment: IssueComment, user: WebHookApiUser): WebHookComment =
-      WebHookComment(
-        id = comment.commentId,
-        user = user,
-        body = comment.content,
-        created_at = comment.registeredDate,
-        updated_at = comment.updatedDate)
-  }
-
-  // https://developer.github.com/v3/issues/comments/#create-a-comment
-  case class CreateAComment(body: String)
-
-
-  // https://developer.github.com/v3/repos/commits/
-  case class WebHookCommitListItemParent(sha: String)(repoFullName:String){
-    val url = ApiPath(s"/api/v3/repos/${repoFullName}/commits/${sha}")
-  }
-  case class WebHookCommitListItemCommit(
-    message: String,
-    author: WebHookCommitUser,
-    committer: WebHookCommitUser)(sha:String, repoFullName: String) {
-    val url = ApiPath(s"/api/v3/repos/${repoFullName}/git/commits/${sha}")
-  }
-
-  case class WebHookCommitListItem(
-    sha: String,
-    commit: WebHookCommitListItemCommit,
-    author: Option[WebHookApiUser],
-    committer: Option[WebHookApiUser],
-    parents: Seq[WebHookCommitListItemParent])(repoFullName: String) {
-    val url = ApiPath(s"/api/v3/repos/${repoFullName}/commits/${sha}")
-  }
-
-  object WebHookCommitListItem {
-    def apply(commit: CommitInfo, repoFullName:String): WebHookCommitListItem = WebHookCommitListItem(
-      sha    = commit.id,
-      commit = WebHookCommitListItemCommit(
-        message   = commit.fullMessage,
-        author    = WebHookCommitUser.author(commit),
-        committer = WebHookCommitUser.committer(commit)
-        )(commit.id, repoFullName),
-      author    = None,
-      committer = None,
-      parents   = commit.parents.map(WebHookCommitListItemParent(_)(repoFullName)))(repoFullName)
-  }
-
-  /**
-   * https://developer.github.com/v3/repos/statuses/#create-a-status
-   */
-  case class CreateAStatus(
-    /* state is Required. The state of the status. Can be one of pending, success, error, or failure. */
-    state: String,
-    /* context is a string label to differentiate this status from the status of other systems. Default: "default" */
-    context: Option[String],
-    /* The target URL to associate with this status. This URL will be linked from the GitHub UI to allow users to easily see the ‘source’ of the Status. */
-    target_url: Option[String],
-    /* description is a short description of the status.*/
-    description: Option[String]
-  ) {
-    def isValid: Boolean = {
-      CommitState.valueOf(state).isDefined &&
-        target_url.filterNot(f => "\\Ahttps?://".r.findPrefixOf(f).isDefined && f.length<255).isEmpty &&
-        context.filterNot(f => f.length<255).isEmpty &&
-        description.filterNot(f => f.length<1000).isEmpty
-    }
-  }
-
-  /**
-   * https://developer.github.com/v3/repos/statuses/#create-a-status
-   * https://developer.github.com/v3/repos/statuses/#list-statuses-for-a-specific-ref
-   */
-  case class WebHookCommitStatus(
-    created_at: Date,
-    updated_at: Date,
-    state: String,
-    target_url: Option[String],
-    description: Option[String],
-    id: Int,
-    context: String,
-    creator: WebHookApiUser
-  )(sha: String, repoFullName: String) {
-    def url = ApiPath(s"/api/v3/repos/${repoFullName}/commits/${sha}/statuses")
-  }
-
-  object WebHookCommitStatus {
-    def apply(status: CommitStatus, creator:WebHookApiUser): WebHookCommitStatus = WebHookCommitStatus(
-      created_at = status.registeredDate,
-      updated_at = status.updatedDate,
-      state      = status.state.name,
-      target_url = status.targetUrl,
-      description= status.description,
-      id         = status.commitStatusId,
-      context    = status.context,
-      creator    = creator
-    )(status.commitId, s"${status.userName}/${status.repositoryName}")
-  }
-
-  /**
-   * https://developer.github.com/v3/repos/statuses/#get-the-combined-status-for-a-specific-ref
-   */
-  case class WebHookCombinedCommitStatus(
-    state: String,
-    sha: String,
-    total_count: Int,
-    statuses: Iterable[WebHookCommitStatus],
-    repository: WebHookRepository){
-    // val commit_url = ApiPath(s"/api/v3/repos/${repository.full_name}/${sha}")
-    val url = ApiPath(s"/api/v3/repos/${repository.full_name}/commits/${sha}/status")
-  }
-  object WebHookCombinedCommitStatus {
-    def apply(sha:String, statuses: Iterable[(CommitStatus, Account)], repository:WebHookRepository): WebHookCombinedCommitStatus = WebHookCombinedCommitStatus(
-      state      = CommitState.combine(statuses.map(_._1.state).toSet).name,
-      sha        = sha,
-      total_count= statuses.size,
-      statuses   = statuses.map{ case (s, a)=> WebHookCommitStatus(s, WebHookApiUser(a)) },
-      repository = repository)
+        repository   = ApiRepository(repository, repositoryUser),
+        issue        = ApiIssue(issue, ApiUser(issueUser)),
+        comment      = ApiComment(comment, ApiUser(commentUser)),
+        sender       = ApiUser(sender))
   }
 }
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index a569db5..a4e94ed 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -180,7 +180,7 @@
           }
 
           // call web hook
-          implicit val apiContext = ApiContext(baseUrl)
+          implicit val apiContext = api.JsonFormat.Context(baseUrl)
           callWebHookOf(owner, repository, "push"){
             for(pusherAccount <- getAccountByUserName(pusher);
               ownerAccount   <- getAccountByUserName(owner);
diff --git a/src/main/scala/util/Implicits.scala b/src/main/scala/util/Implicits.scala
index c9c2919..02ecb82 100644
--- a/src/main/scala/util/Implicits.scala
+++ b/src/main/scala/util/Implicits.scala
@@ -14,7 +14,7 @@
   // Convert to slick session.
   implicit def request2Session(implicit request: HttpServletRequest): JdbcBackend#Session = Database.getSession(request)
 
-  implicit def context2ApiContext(implicit context: app.Context): service.WebHookService.ApiContext = service.WebHookService.ApiContext(context.baseUrl)
+  implicit def context2ApiJsonFormatContext(implicit context: app.Context): api.JsonFormat.Context = api.JsonFormat.Context(context.baseUrl)
 
   implicit class RichSeq[A](seq: Seq[A]) {
 
diff --git a/src/main/scala/util/RepoitoryName.scala b/src/main/scala/util/RepoitoryName.scala
new file mode 100644
index 0000000..1642d9b
--- /dev/null
+++ b/src/main/scala/util/RepoitoryName.scala
@@ -0,0 +1,18 @@
+package util
+
+case class RepositoryName(owner:String, name:String){
+  val fullName = s"${owner}/${name}"
+}
+
+object RepositoryName{
+  def apply(fullName: String): RepositoryName = {
+    fullName.split("/").toList match {
+      case owner :: name :: Nil => RepositoryName(owner, name)
+      case _ => throw new IllegalArgumentException(s"${fullName} is not repositoryName (only 'owner/name')")
+    }
+  }
+  def apply(repository: model.Repository): RepositoryName = RepositoryName(repository.userName, repository.repositoryName)
+  def apply(repository: util.JGitUtil.RepositoryInfo): RepositoryName = RepositoryName(repository.owner, repository.name)
+  def apply(repository: service.RepositoryService.RepositoryInfo): RepositoryName = RepositoryName(repository.owner, repository.name)
+  def apply(repository: model.CommitStatus): RepositoryName = RepositoryName(repository.userName, repository.repositoryName)
+}
diff --git a/src/test/scala/api/JsonFormatSpec.scala b/src/test/scala/api/JsonFormatSpec.scala
new file mode 100644
index 0000000..a000a52
--- /dev/null
+++ b/src/test/scala/api/JsonFormatSpec.scala
@@ -0,0 +1,275 @@
+package api
+import org.specs2.mutable.Specification
+import java.util.{Date, Calendar, TimeZone}
+import util.RepositoryName
+import org.json4s.jackson.JsonMethods.{pretty, parse}
+import org.json4s._
+import org.specs2.matcher._
+class JsonFormatSpec extends Specification {
+  val date1 = {
+    val d = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
+    d.set(2011,3,14,16,0,49)
+    d.getTime
+  }
+  val sha1 = "6dcb09b5b57875f334f61aebed695e2e4193db5e"
+  val repo1Name = RepositoryName("octocat/Hello-World")
+  implicit val context = JsonFormat.Context("http://gitbucket.exmple.com")
+
+  val apiUser = ApiUser(
+    login= "octocat",
+    email= "octocat@example.com",
+    `type`=  "User",
+    site_admin= false,
+    created_at= date1)
+  val apiUserJson = """{
+    "login":"octocat",
+    "email":"octocat@example.com",
+    "type":"User",
+    "site_admin":false,
+    "created_at":"2011-04-14T16:00:49Z",
+    "url":"http://gitbucket.exmple.com/api/v3/users/octocat",
+    "html_url":"http://gitbucket.exmple.com/octocat"
+  }"""
+
+  val repository = ApiRepository(
+    name = repo1Name.name,
+    full_name = repo1Name.fullName,
+    description = "This your first repo!",
+    watchers = 0,
+    forks = 0,
+    `private` = false,
+    default_branch = "master",
+    owner = apiUser)
+  val repositoryJson = s"""{
+    "name" : "Hello-World",
+    "full_name" : "octocat/Hello-World",
+    "description" : "This your first repo!",
+    "watchers" : 0,
+    "forks" : 0,
+    "private" : false,
+    "default_branch" : "master",
+    "owner" : $apiUserJson,
+    "forks_count" : 0,
+    "watchers_coun" : 0,
+    "url" : "${context.baseUrl}/api/v3/repos/octocat/Hello-World",
+    "http_url" : "${context.baseUrl}/git/octocat/Hello-World.git",
+    "clone_url" : "${context.baseUrl}/git/octocat/Hello-World.git",
+    "html_url" : "${context.baseUrl}/octocat/Hello-World"
+  }"""
+
+  val apiCommitStatus = ApiCommitStatus(
+    created_at = date1,
+    updated_at = date1,
+    state = "success",
+    target_url = Some("https://ci.example.com/1000/output"),
+    description = Some("Build has completed successfully"),
+    id = 1,
+    context = "Default",
+    creator = apiUser
+  )(sha1, repo1Name)
+  val apiCommitStatusJson = s"""{
+    "created_at":"2011-04-14T16:00:49Z",
+    "updated_at":"2011-04-14T16:00:49Z",
+    "state":"success",
+    "target_url":"https://ci.example.com/1000/output",
+    "description":"Build has completed successfully",
+    "id":1,
+    "context":"Default",
+    "creator":$apiUserJson,
+    "url": "http://gitbucket.exmple.com/api/v3/repos/octocat/Hello-World/commits/6dcb09b5b57875f334f61aebed695e2e4193db5e/statuses"
+  }"""
+
+  val apiComment = ApiComment(
+    id =1,
+    user = apiUser,
+    body= "Me too",
+    created_at= date1,
+    updated_at= date1)
+  val apiCommentJson = s"""{
+    "id": 1,
+    "body": "Me too",
+    "user": $apiUserJson,
+    "created_at": "2011-04-14T16:00:49Z",
+    "updated_at": "2011-04-14T16:00:49Z"
+  }"""
+
+  val apiPersonIdent    = ApiPersonIdent("Monalisa Octocat","support@example.com",date1)
+  val apiPersonIdentJson = """ {
+    "name": "Monalisa Octocat",
+    "email": "support@example.com",
+    "date": "2011-04-14T16:00:49Z"
+  }"""
+
+  val apiCommitListItem = ApiCommitListItem(
+    sha = sha1,
+    commit = ApiCommitListItem.Commit(
+      message   = "Fix all the bugs",
+      author    = apiPersonIdent,
+      committer = apiPersonIdent
+      )(sha1, repo1Name),
+    author = Some(apiUser),
+    committer= Some(apiUser),
+    parents= Seq(ApiCommitListItem.Parent("6dcb09b5b57875f334f61aebed695e2e4193db5e")(repo1Name)))(repo1Name)
+  val apiCommitListItemJson = s"""{
+    "url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/commits/6dcb09b5b57875f334f61aebed695e2e4193db5e",
+    "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+    "commit": {
+      "url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/git/commits/6dcb09b5b57875f334f61aebed695e2e4193db5e",
+      "author": $apiPersonIdentJson,
+      "committer": $apiPersonIdentJson,
+      "message": "Fix all the bugs"
+    },
+    "author": $apiUserJson,
+    "committer": $apiUserJson,
+    "parents": [
+      {
+        "url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/commits/6dcb09b5b57875f334f61aebed695e2e4193db5e",
+        "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e"
+      }
+    ]
+  }"""
+
+  val apiCombinedCommitStatus = ApiCombinedCommitStatus(
+    state = "success",
+    sha = sha1,
+    total_count = 2,
+    statuses = List(apiCommitStatus),
+    repository = repository)
+  val apiCombinedCommitStatusJson = s"""{
+    "state": "success",
+    "sha": "$sha1",
+    "total_count": 2,
+    "statuses": [ $apiCommitStatusJson ],
+    "repository": $repositoryJson,
+    "url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/commits/$sha1/status"
+  }"""
+
+  val apiIssue = ApiIssue(
+      number = 1347,
+      title  = "Found a bug",
+      user   = apiUser,
+      state  = "open",
+      body   = "I'm having a problem with this.",
+      created_at = date1,
+      updated_at = date1)
+  val apiIssueJson = s"""{
+    "number": 1347,
+    "state": "open",
+    "title": "Found a bug",
+    "body": "I'm having a problem with this.",
+    "user": $apiUserJson,
+    "created_at": "2011-04-14T16:00:49Z",
+    "updated_at": "2011-04-14T16:00:49Z"
+  }"""
+
+  val apiPullRequest = ApiPullRequest(
+      number     = 1347,
+      updated_at = date1,
+      created_at = date1,
+      head       = ApiPullRequest.Commit(
+                     sha  = sha1,
+                     ref  = "new-topic",
+                     repo = repository)("octocat"),
+      base       = ApiPullRequest.Commit(
+                     sha  = sha1,
+                     ref  = "master",
+                     repo = repository)("octocat"),
+      mergeable  = None,
+      title      = "new-feature",
+      body       = "Please pull these awesome changes",
+      user       = apiUser
+    )
+  val apiPullRequestJson = s"""{
+    "url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/pulls/1347",
+    "html_url": "${context.baseUrl}/octocat/Hello-World/pull/1347",
+  //  "diff_url": "${context.baseUrl}/octocat/Hello-World/pull/1347.diff",
+  //  "patch_url": "${context.baseUrl}/octocat/Hello-World/pull/1347.patch",
+  //  "issue_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/issues/1347",
+    "commits_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/pulls/1347/commits",
+    "review_comments_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/pulls/1347/comments",
+    "review_comment_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/pulls/comments/{number}",
+    "comments_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/issues/1347/comments",
+    "statuses_url": "${context.baseUrl}/api/v3/repos/octocat/Hello-World/statuses/6dcb09b5b57875f334f61aebed695e2e4193db5e",
+    "number": 1347,
+  //  "state": "open",
+    "title": "new-feature",
+    "body": "Please pull these awesome changes",
+    "created_at": "2011-04-14T16:00:49Z",
+    "updated_at": "2011-04-14T16:00:49Z",
+  //  "closed_at": "2011-04-14T16:00:49Z",
+  //  "merged_at": "2011-04-14T16:00:49Z",
+    "head": {
+      "label": "new-topic",
+      "ref": "new-topic",
+      "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+      "user": $apiUserJson,
+      "repo": $repositoryJson
+    },
+    "base": {
+      "label": "master",
+      "ref": "master",
+      "sha": "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+      "user": $apiUserJson,
+      "repo": $repositoryJson
+    },
+    "user": $apiUserJson
+  //  "merge_commit_sha": "e5bd3914e2e596debea16f433f57875b5b90bcd6",
+  //  "merged": false,
+  //  "mergeable": true,
+  //  "merged_by": $$apiUserJson,
+  //  "comments": 10,
+  //  "commits": 3,
+  //  "additions": 100,
+  //  "deletions": 3,
+  //  "changed_files": 5
+    }"""
+  def beFormatted(json2Arg:String) = new Matcher[String] {
+    def apply[S <: String](e: Expectable[S]) = {
+      import java.util.regex.Pattern
+      val json2 = Pattern.compile("""^\s*//.*$""", Pattern.MULTILINE).matcher(json2Arg).replaceAll("")
+      val js2 = try{
+        parse(json2)
+      }catch{
+        case e:com.fasterxml.jackson.core.JsonParseException => {
+          val p = java.lang.Math.max(e.getLocation.getCharOffset()-10,0).toInt
+          val message = json2.substring(p,java.lang.Math.min(p+100,json2.length))
+          throw new com.fasterxml.jackson.core.JsonParseException(message + e.getMessage , e.getLocation)
+        }
+      }
+      val js1 = parse(e.value)
+      result(js1 == js2,
+        "expected",
+        {
+            val diff = js2 diff js1
+            s"${pretty(js1)} is not ${pretty(js2)} \n\n ${pretty(Extraction.decompose(diff)(org.json4s.DefaultFormats))}"
+        },
+        e)
+    }
+  }
+  "JsonFormat" should {
+    "apiUser" in {
+        JsonFormat(apiUser) must beFormatted(apiUserJson)
+    }
+    "repository" in {
+        JsonFormat(repository) must beFormatted(repositoryJson)
+    }
+    "apiComment" in {
+        JsonFormat(apiComment) must beFormatted(apiCommentJson)
+    }
+    "apiCommitListItem" in {
+        JsonFormat(apiCommitListItem) must beFormatted(apiCommitListItemJson)
+    }
+    "apiCommitStatus" in {
+      JsonFormat(apiCommitStatus) must beFormatted(apiCommitStatusJson)
+    }
+    "apiCombinedCommitStatus" in {
+      JsonFormat(apiCombinedCommitStatus) must beFormatted(apiCombinedCommitStatusJson)
+    }
+    "apiIssue" in {
+      JsonFormat(apiIssue) must beFormatted(apiIssueJson)
+    }
+    "apiPullRequest" in {
+      JsonFormat(apiPullRequest) must beFormatted(apiPullRequestJson)
+    }
+  }
+}