# API Docs Automate GitLab via a simple and powerful API. The main GitLab API is a [REST](https://en.wikipedia.org/wiki/Representational_state_transfer) API. Therefore, documentation in this section assumes knowledge of REST concepts. ## Available API resources For a list of the available resources and their endpoints, see [API resources](api_resources.md). ## SCIM **(SILVER ONLY)** [GitLab.com Silver and above](https://about.gitlab.com/pricing/) provides an [SCIM API](scim.md) that implements [the RFC7644 protocol](https://tools.ietf.org/html/rfc7644) and provides the `/Users` endpoint. The base URL is: `/api/scim/v2/groups/:group_path/Users/`. ## Road to GraphQL [GraphQL](graphql/index.md) is available in GitLab, which will allow deprecation of controller-specific endpoints. GraphQL has a number of benefits: 1. We avoid having to maintain two different APIs. 1. Callers of the API can request only what they need. 1. It is versioned by default. It will co-exist with the current v4 REST API. If we have a v5 API, this should be a compatibility layer on top of GraphQL. Although there were some patenting and licensing concerns with GraphQL, these have been resolved to our satisfaction by the relicensing of the reference implementations under MIT, and the use of the OWF license for the GraphQL specification. ## Compatibility guidelines The HTTP API is versioned using a single number, the current one being 4. This number symbolizes the same as the major version number as described by [SemVer](https://semver.org/). This mean that backward incompatible changes will require this version number to change. However, the minor version is not explicit. This allows for a stable API endpoint, but also means new features can be added to the API in the same version number. New features and bug fixes are released in tandem with a new GitLab, and apart from incidental patch and security releases, are released on the 22nd of each month. Backward incompatible changes (e.g. endpoints removal, parameters removal etc.), as well as removal of entire API versions are done in tandem with a major point release of GitLab itself. All deprecations and changes between two versions should be listed in the documentation. For the changes between v3 and v4; please read the [v3 to v4 documentation](v3_to_v4.md) ### Current status Currently only API version v4 is available. Version v3 was removed in [GitLab 11.0](https://gitlab.com/gitlab-org/gitlab-foss/issues/36819). ## Basic usage API requests should be prefixed with `api` and the API version. The API version is defined in [`lib/api.rb`](https://gitlab.com/gitlab-org/gitlab-foss/tree/master/lib/api/api.rb). For example, the root of the v4 API is at `/api/v4`. Example of a valid API request using cURL: ```shell curl "https://gitlab.example.com/api/v4/projects" ``` The API uses JSON to serialize data. You don't need to specify `.json` at the end of an API URL. ## Authentication Most API requests require authentication, or will only return public data when authentication is not provided. For those cases where it is not required, this will be mentioned in the documentation for each individual endpoint. For example, the [`/projects/:id` endpoint](projects.md). There are four ways to authenticate with the GitLab API: 1. [OAuth2 tokens](#oauth2-tokens) 1. [Personal access tokens](#personal-access-tokens) 1. [Session cookie](#session-cookie) 1. [GitLab CI/CD job token](#gitlab-ci-job-token) **(Specific endpoints only)** For admins who want to authenticate with the API as a specific user, or who want to build applications or scripts that do so, two options are available: 1. [Impersonation tokens](#impersonation-tokens) 1. [Sudo](#sudo) If authentication information is invalid or omitted, an error message will be returned with status code `401`: ```json { "message": "401 Unauthorized" } ``` ### OAuth2 tokens You can use an [OAuth2 token](oauth2.md) to authenticate with the API by passing it in either the `access_token` parameter or the `Authorization` header. Example of using the OAuth2 token in a parameter: ```shell curl https://gitlab.example.com/api/v4/projects?access_token=OAUTH-TOKEN ``` Example of using the OAuth2 token in a header: ```shell curl --header "Authorization: Bearer OAUTH-TOKEN" https://gitlab.example.com/api/v4/projects ``` Read more about [GitLab as an OAuth2 provider](oauth2.md). ### Personal access tokens You can use a [personal access token](../user/profile/personal_access_tokens.md) to authenticate with the API by passing it in either the `private_token` parameter or the `Private-Token` header. Example of using the personal access token in a parameter: ```shell curl https://gitlab.example.com/api/v4/projects?private_token= ``` Example of using the personal access token in a header: ```shell curl --header "Private-Token: " https://gitlab.example.com/api/v4/projects ``` You can also use personal access tokens with OAuth-compliant headers: ```shell curl --header "Authorization: Bearer " https://gitlab.example.com/api/v4/projects ``` Read more about [personal access tokens](../user/profile/personal_access_tokens.md). ### Session cookie When signing in to the main GitLab application, a `_gitlab_session` cookie is set. The API will use this cookie for authentication if it is present, but using the API to generate a new session cookie is currently not supported. The primary user of this authentication method is the web frontend of GitLab itself, which can use the API as the authenticated user to get a list of their projects, for example, without needing to explicitly pass an access token. ### GitLab CI job token With a few API endpoints you can use a [GitLab CI/CD job token](../user/project/new_ci_build_permissions_model.md#job-token) to authenticate with the API: - [Get job artifacts](jobs.md#get-job-artifacts) - [Pipeline triggers](pipeline_triggers.md) - [Release creation](releases/index.md#create-a-release) ### Impersonation tokens > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/9099) in GitLab 9.0. Needs admin permissions. Impersonation tokens are a type of [personal access token](../user/profile/personal_access_tokens.md) that can only be created by an admin for a specific user. They are a great fit if you want to build applications or scripts that authenticate with the API as a specific user. They are an alternative to directly using the user's password or one of their personal access tokens, and to using the [Sudo](#sudo) feature, since the user's (or admin's, in the case of Sudo) password/token may not be known or may change over time. For more information, refer to the [users API](users.md#create-an-impersonation-token) docs. Impersonation tokens are used exactly like regular personal access tokens, and can be passed in either the `private_token` parameter or the `Private-Token` header. #### Disable impersonation > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/40385) in GitLab 11.6. By default, impersonation is enabled. To disable impersonation: **For Omnibus installations** 1. Edit `/etc/gitlab/gitlab.rb`: ```ruby gitlab_rails['impersonation_enabled'] = false ``` 1. Save the file and [reconfigure](../administration/restart_gitlab.md#omnibus-gitlab-reconfigure) GitLab for the changes to take effect. To re-enable impersonation, remove this configuration and reconfigure GitLab. **For installations from source** 1. Edit `config/gitlab.yml`: ```yaml gitlab: impersonation_enabled: false ``` 1. Save the file and [restart](../administration/restart_gitlab.md#installations-from-source) GitLab for the changes to take effect. To re-enable impersonation, remove this configuration and restart GitLab. ### Sudo NOTE: **Note:** Only available to [administrators](../user/permissions.md). All API requests support performing an API call as if you were another user, provided you are authenticated as an administrator with an OAuth or Personal Access Token that has the `sudo` scope. You need to pass the `sudo` parameter either via query string or a header with an ID/username of the user you want to perform the operation as. If passed as a header, the header name must be `Sudo`. NOTE: **Note:** Usernames are case insensitive. If a non administrative access token is provided, an error message will be returned with status code `403`: ```json { "message": "403 Forbidden - Must be admin to use sudo" } ``` If an access token without the `sudo` scope is provided, an error message will be returned with status code `403`: ```json { "error": "insufficient_scope", "error_description": "The request requires higher privileges than provided by the access token.", "scope": "sudo" } ``` If the sudo user ID or username cannot be found, an error message will be returned with status code `404`: ```json { "message": "404 User with ID or username '123' Not Found" } ``` Example of a valid API call and a request using cURL with sudo request, providing a username: ```plaintext GET /projects?private_token=&sudo=username ``` ```shell curl --header "Private-Token: " --header "Sudo: username" "https://gitlab.example.com/api/v4/projects" ``` Example of a valid API call and a request using cURL with sudo request, providing an ID: ```plaintext GET /projects?private_token=&sudo=23 ``` ```shell curl --header "Private-Token: " --header "Sudo: 23" "https://gitlab.example.com/api/v4/projects" ``` ## Status codes The API is designed to return different status codes according to context and action. This way, if a request results in an error, the caller is able to get insight into what went wrong. The following table gives an overview of how the API functions generally behave. | Request type | Description | | ------------ | ----------- | | `GET` | Access one or more resources and return the result as JSON. | | `POST` | Return `201 Created` if the resource is successfully created and return the newly created resource as JSON. | | `GET` / `PUT` | Return `200 OK` if the resource is accessed or modified successfully. The (modified) result is returned as JSON. | | `DELETE` | Returns `204 No Content` if the resource was deleted successfully. | The following table shows the possible return codes for API requests. | Return values | Description | | ------------- | ----------- | | `200 OK` | The `GET`, `PUT` or `DELETE` request was successful, the resource(s) itself is returned as JSON. | | `204 No Content` | The server has successfully fulfilled the request and that there is no additional content to send in the response payload body. | | `201 Created` | The `POST` request was successful and the resource is returned as JSON. | | `304 Not Modified` | Indicates that the resource has not been modified since the last request. | | `400 Bad Request` | A required attribute of the API request is missing, e.g., the title of an issue is not given. | | `401 Unauthorized` | The user is not authenticated, a valid [user token](#authentication) is necessary. | | `403 Forbidden` | The request is not allowed, e.g., the user is not allowed to delete a project. | | `404 Not Found` | A resource could not be accessed, e.g., an ID for a resource could not be found. | | `405 Method Not Allowed` | The request is not supported. | | `409 Conflict` | A conflicting resource already exists, e.g., creating a project with a name that already exists. | | `412` | Indicates the request was denied. May happen if the `If-Unmodified-Since` header is provided when trying to delete a resource, which was modified in between. | | `422 Unprocessable` | The entity could not be processed. | | `500 Server Error` | While handling the request something went wrong server-side. | ## Pagination We support two kinds of pagination methods: - Offset-based pagination. This is the default method and available on all endpoints. - Keyset-based pagination. Added to selected endpoints but being [progressively rolled out](https://gitlab.com/groups/gitlab-org/-/epics/2039). For large collections, we recommend keyset pagination (when available) over offset pagination for performance reasons. ### Offset-based pagination Sometimes the returned result will span across many pages. When listing resources you can pass the following parameters: | Parameter | Description | | --------- | ----------- | | `page` | Page number (default: `1`) | | `per_page`| Number of items to list per page (default: `20`, max: `100`) | In the example below, we list 50 [namespaces](namespaces.md) per page. ```shell curl --request PUT --header "PRIVATE-TOKEN: " "https://gitlab.example.com/api/v4/namespaces?per_page=50" ``` #### Pagination Link header [Link headers](https://www.w3.org/wiki/LinkHeader) are sent back with each response. They have `rel` set to prev/next/first/last and contain the relevant URL. Please use these links instead of generating your own URLs. In the cURL example below, we limit the output to 3 items per page (`per_page=3`) and we request the second page (`page=2`) of [comments](notes.md) of the issue with ID `8` which belongs to the project with ID `8`: ```shell curl --head --header "PRIVATE-TOKEN: " https://gitlab.example.com/api/v4/projects/8/issues/8/notes?per_page=3&page=2 ``` The response will then be: ```http HTTP/1.1 200 OK Cache-Control: no-cache Content-Length: 1103 Content-Type: application/json Date: Mon, 18 Jan 2016 09:43:18 GMT Link: ; rel="prev", ; rel="next", ; rel="first", ; rel="last" Status: 200 OK Vary: Origin X-Next-Page: 3 X-Page: 2 X-Per-Page: 3 X-Prev-Page: 1 X-Request-Id: 732ad4ee-9870-4866-a199-a9db0cde3c86 X-Runtime: 0.108688 X-Total: 8 X-Total-Pages: 3 ``` #### Other pagination headers Additional pagination headers are also sent back. | Header | Description | | ------ | ----------- | | `X-Total` | The total number of items | | `X-Total-Pages` | The total number of pages | | `X-Per-Page` | The number of items per page | | `X-Page` | The index of the current page (starting at 1) | | `X-Next-Page` | The index of the next page | | `X-Prev-Page` | The index of the previous page | CAUTION: **Caution:** For performance reasons since [GitLab 11.8](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/23931) and **behind the `api_kaminari_count_with_limit` [feature flag](../development/feature_flags/index.md)**, if the number of resources is more than 10,000, the `X-Total` and `X-Total-Pages` headers as well as the `rel="last"` `Link` are not present in the response headers. ### Keyset-based pagination Keyset-pagination allows for more efficient retrieval of pages and - in contrast to offset-based pagination - runtime is independent of the size of the collection. This method is controlled by the following parameters: | Parameter | Description | | ------------ | -------------------------------------- | | `pagination` | `keyset` (to enable keyset pagination) | | `per_page` | Number of items to list per page (default: `20`, max: `100`) | In the example below, we list 50 [projects](projects.md) per page, ordered by `id` ascending. ```shell curl --request GET --header "PRIVATE-TOKEN: " "https://gitlab.example.com/api/v4/projects?pagination=keyset&per_page=50&order_by=id&sort=asc" ``` The response header includes a link to the next page. For example: ```http HTTP/1.1 200 OK ... Links: ; rel="next" Status: 200 OK ... ``` The link to the next page contains an additional filter `id_after=42` which excludes records we have retrieved already. Note the type of filter depends on the `order_by` option used and we may have more than one additional filter. When the end of the collection has been reached and there are no additional records to retrieve, the `Links` header is absent and the resulting array is empty. We recommend using only the given link to retrieve the next page instead of building your own URL. Apart from the headers shown, we don't expose additional pagination headers. Keyset-based pagination is only supported for selected resources and ordering options: | Resource | Order | | ------------------------- | -------------------------- | | [Projects](projects.md) | `order_by=id` only | ## Path parameters If an endpoint has path parameters, the documentation shows them with a preceding colon. For example: ```plaintext DELETE /projects/:id/share/:group_id ``` The `:id` path parameter needs to be replaced with the project id, and the `:group_id` needs to be replaced with the id of the group. The colons `:` should not be included. The resulting cURL call for a project with id `5` and a group id of `17` is then: ```shell curl --request DELETE --header "PRIVATE-TOKEN: " https://gitlab.example.com/api/v4/projects/5/share/17 ``` ## Namespaced path encoding If using namespaced API calls, make sure that the `NAMESPACE/PROJECT_PATH` is URL-encoded. For example, `/` is represented by `%2F`: ```plaintext GET /api/v4/projects/diaspora%2Fdiaspora ``` NOTE: **Note:** A project's **path** is not necessarily the same as its **name**. A project's path can be found in the project's URL or in the project's settings under **General > Advanced > Change path**. ## Branches and tags name encoding If your branch or tag contains a `/`, make sure the branch/tag name is URL-encoded. For example, `/` is represented by `%2F`: ```plaintext GET /api/v4/projects/1/branches/my%2Fbranch/commits ``` ## Encoding API parameters of `array` and `hash` types We can call the API with `array` and `hash` types parameters as shown below: ### `array` `import_sources` is a parameter of type `array`: ```shell curl --request POST --header "PRIVATE-TOKEN: " \ -d "import_sources[]=github" \ -d "import_sources[]=bitbucket" \ https://gitlab.example.com/api/v4/some_endpoint ``` ### `hash` `override_params` is a parameter of type `hash`: ```shell curl --request POST --header "PRIVATE-TOKEN: " \ --form "namespace=email" \ --form "path=impapi" \ --form "file=@/path/to/somefile.txt" --form "override_params[visibility]=private" \ --form "override_params[some_other_param]=some_value" \ https://gitlab.example.com/api/v4/projects/import ``` ### Array of hashes `variables` is a parameter of type `array` containing hash key/value pairs `[{ 'key' => 'UPLOAD_TO_S3', 'value' => 'true' }]`: ```shell curl --globoff --request POST --header "PRIVATE-TOKEN: ********************" \ "https://gitlab.example.com/api/v4/projects/169/pipeline?ref=master&variables[][key]=VAR1&variables[][value]=hello&variables[][key]=VAR2&variables[][value]=world" curl --request POST --header "PRIVATE-TOKEN: ********************" \ --header "Content-Type: application/json" \ --data '{ "ref": "master", "variables": [ {"key": "VAR1", "value": "hello"}, {"key": "VAR2", "value": "world"} ] }' \ "https://gitlab.example.com/api/v4/projects/169/pipeline" ``` ## `id` vs `iid` Some resources have two similarly-named fields. For example, [issues](issues.md), [merge requests](merge_requests.md), and [project milestones](merge_requests.md). The fields are: - `id`: ID that is unique across all projects. - `iid`: additional, internal ID that is unique in the scope of a single project. NOTE: **Note:** The `iid` is displayed in the web UI. If a resource has the `iid` field and the `id` field, the `iid` field is usually used instead of `id` to fetch the resource. For example, suppose a project with `id: 42` has an issue with `id: 46` and `iid: 5`. In this case: - A valid API call to retrieve the issue is `GET /projects/42/issues/5` - An invalid API call to retrieve the issue is `GET /projects/42/issues/46`. NOTE: **Note:** Not all resources with the `iid` field are fetched by `iid`. For guidance on which field to use, see the documentation for the specific resource. ## Data validation and error reporting When working with the API you may encounter validation errors, in which case the API will answer with an HTTP `400` status. Such errors appear in two cases: - A required attribute of the API request is missing, e.g., the title of an issue is not given - An attribute did not pass the validation, e.g., user bio is too long When an attribute is missing, you will get something like: ```http HTTP/1.1 400 Bad Request Content-Type: application/json { "message":"400 (Bad request) \"title\" not given" } ``` When a validation error occurs, error messages will be different. They will hold all details of validation errors: ```http HTTP/1.1 400 Bad Request Content-Type: application/json { "message": { "bio": [ "is too long (maximum is 255 characters)" ] } } ``` This makes error messages more machine-readable. The format can be described as follows: ```json { "message": { "": [ "", "", ... ], "": { "": [ "", "", ... ], } } } ``` ## Unknown route When you try to access an API URL that does not exist you will receive 404 Not Found. ```http HTTP/1.1 404 Not Found Content-Type: application/json { "error": "404 Not Found" } ``` ## Encoding `+` in ISO 8601 dates If you need to include a `+` in a query parameter, you may need to use `%2B` instead due to a [W3 recommendation](http://www.w3.org/Addressing/URL/4_URI_Recommentations.html) that causes a `+` to be interpreted as a space. For example, in an ISO 8601 date, you may want to pass a time in Mountain Standard Time, such as: ```plaintext 2017-10-17T23:11:13.000+05:30 ``` The correct encoding for the query parameter would be: ```plaintext 2017-10-17T23:11:13.000%2B05:30 ``` ## Clients There are many unofficial GitLab API Clients for most of the popular programming languages. Visit the [GitLab website](https://about.gitlab.com/partners/#api-clients) for a complete list. ## Rate limits For administrator documentation on rate limit settings, see [Rate limits](../security/rate_limits.md). To find the settings that are specifically used by GitLab.com, see [GitLab.com-specific rate limits](../user/gitlab_com/index.md#gitlabcom-specific-rate-limits).