# V3 to V4 version

Since GitLab 9.0, API V4 is the preferred version to be used.

V3 will remain working until at least GitLab 9.3. The V3 API documentation is still [available](https://gitlab.com/gitlab-org/gitlab-ce/blob/8-16-stable/doc/api/README.md).

Below are the changes made between V3 and V4.

### 8.17

- Removed `/projects/:search` (use: `/projects?search=x`) [!8877](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8877)
- `iid` filter has been removed from `projects/:id/issues` [!8967](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8967)
- `projects/:id/merge_requests?iid[]=x&iid[]=y` array filter has been renamed to `iids` [!8793](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8793)
- Endpoints under `projects/merge_request/:id` have been removed (use: `projects/merge_requests/:id`) [!8793](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8793)
- Project snippets do not return deprecated field `expires_at` [!8723](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8723)
- Endpoints under `projects/:id/keys` have been removed (use `projects/:id/deploy_keys`) [!8716](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8716)

### 9.0

- Status 409 returned for POST `project/:id/members` when a member already exists [!9093](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9093)
- Moved `DELETE /projects/:id/star` to `POST /projects/:id/unstar` [!9328](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9328)
- Removed the following deprecated Templates endpoints (these are still accessible with `/templates` prefix) [!8853](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8853)
  - `/licences`
  - `/licences/:key`
  - `/gitignores`
  - `/gitlab_ci_ymls`
  - `/dockerfiles`
  - `/gitignores/:key`
  - `/gitlab_ci_ymls/:key`
  - `/dockerfiles/:key`
- Moved `/projects/fork/:id` to `/projects/:id/fork` [!8940](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8940)
- Moved `DELETE /todos` to `POST /todos/mark_as_done` and `DELETE /todos/:todo_id` to `POST /todos/:todo_id/mark_as_done` [!9410](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9410)
- Project filters are no longer available as `GET /projects/foo`, but as `GET /projects?foo=true` instead [!8962](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8962)
  - `GET /projects/visible` & `GET /projects/all` are consolidated into `GET /projects` and can be used with or without authorization
  - `GET /projects/owned` moved to `GET /projects?owned=true`
  - `GET /projects/starred` moved to `GET /projects?starred=true`
- `GET /projects` returns all projects visible to current user, even if the user is not a member [!9674](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9674)
  - To get projects the user is a member of, use `/projects?membership=true`
- Return pagination headers for all endpoints that return an array [!8606](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8606)
- Added `POST /environments/:environment_id/stop` to stop an environment [!8808](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8808)
- Removed `DELETE projects/:id/deploy_keys/:key_id/disable`. Use `DELETE projects/:id/deploy_keys/:key_id` instead [!9366](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9366)
- Moved `PUT /users/:id/(block|unblock)` to `POST /users/:id/(block|unblock)` [!9371](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9371)
- Make subscription API more RESTful. Use `post ":project_id/:subscribable_type/:subscribable_id/subscribe"` to subscribe and `post ":project_id/:subscribable_type/:subscribable_id/unsubscribe"` to unsubscribe from a resource. [!9325](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9325)
- Labels filter on `projects/:id/issues` and `/issues` now matches only issues containing all labels (i.e.: Logical AND, not OR) [!8849](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8849)
- Renamed param `branch_name` to `branch` on the following endpoints [!8936](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8936)
  - POST `:id/repository/branches`
  - POST `:id/repository/commits`
  - POST/PUT/DELETE `:id/repository/files`
- Renamed `merge when build succeeds` to merge `when pipeline succeeds parameters` on the following endpoints: [!9335](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/)
  - PUT `projects/:id/merge_requests/:merge_request_id/merge`
  - POST `projects/:id/merge_requests/:merge_request_id/cancel_merge_when_pipeline_succeeds`
  - POST `projects`
  - POST `projects/user/:user_id`
  - PUT `projects/:id`
- Renamed `branch_name` to `branch` on DELETE `id/repository/branches/:branch` response [!8936](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8936)
- Remove `public` param from create and edit actions of projects [!8736](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8736)
- Remove `subscribed` field from responses returning list of issues or merge
  requests. Fetch individual issues or merge requests to obtain the value
  of `subscribed`
  [!9661](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9661)
- Use `visibility` as string parameter everywhere [!9337](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9337)
- Notes do not return deprecated field `upvote` and `downvote` [!9384](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9384)
- Return HTTP status code `400` for all validation errors when creating or updating a member instead of sometimes `422` error. [!9523](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9523)
- Remove `GET /groups/owned`. Use `GET /groups?owned=true` instead [!9505](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9505)
- Return 202 with JSON body on async removals on V4 API (DELETE `/projects/:id/repository/merged_branches` and DELETE `/projects/:id`) [!9449](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9449)
- `projects/:id/milestones?iid[]=x&iid[]=y` array filter has been renamed to `iids` [!9096](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9096)
- Return basic info about pipeline in `GET /projects/:id/pipelines` [!8875](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8875)
- Renamed all `build` references to `job` [!9463](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9463)
- Drop GET '/projects/:id/repository/commits/:sha/jobs' [!9463](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9463)
- Rename Build Triggers to be Pipeline Triggers API [!9713](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9713)
  - `POST /projects/:id/trigger/builds` to `POST /projects/:id/trigger/pipeline`
  - Require description when creating a new trigger `POST /projects/:id/triggers`
- Simplify project payload exposed on Environment endpoints [!9675](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9675)
- API uses merge request `IID`s (internal ID, as in the web UI) rather than `ID`s. This affects the merge requests, award emoji, todos, and time tracking APIs. [!9530](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9530)
- API uses issue `IID`s (internal ID, as in the web UI) rather than `ID`s. This affects the issues, award emoji, todos, and time tracking APIs. [!9530](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9530)
- Change initial page from `0` to `1` on `GET projects/:id/repository/commits` (like on the rest of the API) [!9679] (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9679)
- Return correct `Link` header data for `GET projects/:id/repository/commits` [!9679] (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9679)
- Update endpoints for repository files [!9637](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9637)
  - Moved `/projects/:id/repository/files?file_path=:file_path` to `/projects/:id/repository/files/:file_path` (`:file_path` should be URL-encoded)
  - `/projects/:id/repository/blobs/:sha` now returns JSON attributes for the blob identified by `:sha`, instead of finding the commit identified by `:sha` and returning the raw content of the blob in that commit identified by the required `?filepath=:filepath`
  - Moved `/projects/:id/repository/commits/:sha/blob?file_path=:file_path`  and `/projects/:id/repository/blobs/:sha?file_path=:file_path`  to `/projects/:id/repository/files/:file_path/raw?ref=:sha`
  - `/projects/:id/repository/tree` parameter `ref_name` has been renamed to `ref` for consistency
