• Compatibility guidelines
  • Current status
• How to use the API
  • Valid API request
  • API request to expose HTTP response headers
  • API request that includes the exit code
• Authentication
  • OAuth 2.0 tokens
  • Personal/project/group access tokens
  • Session cookie
  • Impersonation tokens
    • Disable impersonation
  • Sudo
• Status codes
• Pagination
  • Offset-based pagination
    • Pagination Link header
    • Other pagination headers
  • Keyset-based pagination
    • Supported resources
  • Pagination response headers
• Path parameters
• Namespaced path encoding
• File path, branches, and tags name encoding
• Request Payload
• Encoding API parameters of array and hash types
  • array
  • hash
  • Array of hashes
• id vs iid
• null vs false
• Data validation and error reporting
• Unknown route
• Encoding + in ISO 8601 dates
• Clients
• Rate limits
• Content type
• Resolve requests detected as spam

REST API

The REST APIs have been around for a longer time compared to GraphQL APIs, which may make them more familiar to some developers. It is often a good choice for developers who are more comfortable with traditional API architecture.

Compatibility guidelines

The HTTP API is versioned with a single number, which is 4. This number symbolizes the major version number, as described by SemVer. Because of this, backward-incompatible changes require this version number to change.

The minor version isn’t explicit, which allows for a stable API endpoint. New features can be added to the API in the same version number.

New features and bug fixes are released in tandem with GitLab. Apart from incidental patch and security releases, GitLab is released on the 22nd of each month. Major API version changes, and removal of entire API versions, are done in tandem with major GitLab releases.

All deprecations and changes between versions are in the documentation.

Current status

Only API version v4 is available.

How to use the API

API requests must include both api and the API version. The API version is defined in lib/api.rb. For example, the root of the v4 API is at /api/v4.

Valid API request

The following is a basic example of a request to the fictional gitlab.example.com endpoint:

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 the API URL.

API request to expose HTTP response headers

If you want to expose HTTP response headers, use the --include option:

curl --include "https://gitlab.example.com/api/v4/projects"
HTTP/2 200
...

This request can help you investigate an unexpected response.

API request that includes the exit code

If you want to expose the HTTP exit code, include the --fail option:

curl --fail "https://gitlab.example.com/api/v4/does-not-exist"
curl: (22) The requested URL returned error: 404

The HTTP exit code can help you diagnose the success or failure of your REST request.

Authentication

Most API requests require authentication, or only return public data when authentication isn’t provided. When authentication is not required, the documentation for each endpoint specifies this. For example, the /projects/:id endpoint does not require authentication.

You can authenticate with the GitLab API in several ways:

• OAuth 2.0 tokens
• Personal access tokens
• Project access tokens
• Group access tokens
• Session cookie
• GitLab CI/CD job token (Specific endpoints only)

Project access tokens are supported by:

• Self-managed GitLab Free and higher.
• GitLab SaaS Premium and higher.

If you are an administrator, you or your application can authenticate as a specific user. To do so, use:

• Impersonation tokens
• Sudo

If authentication information is not valid or is missing, GitLab returns an error message with a status code of 401:

{
  "message": "401 Unauthorized"
}

OAuth 2.0 tokens

You can use an OAuth 2.0 token to authenticate with the API by passing it in either the access_token parameter or the Authorization header.

Example of using the OAuth 2.0 token in a parameter:

curl "https://gitlab.example.com/api/v4/projects?access_token=OAUTH-TOKEN"

Example of using the OAuth 2.0 token in a header:

curl --header "Authorization: Bearer OAUTH-TOKEN" "https://gitlab.example.com/api/v4/projects"

Read more about GitLab as an OAuth 2.0 provider.

A default refresh setting of two hours is tracked in this issue.

Personal/project/group access tokens

You can use access tokens to authenticate with the API by passing it in either the private_token parameter or the PRIVATE-TOKEN header.

Example of using the personal, project, or group access token in a parameter:

curl "https://gitlab.example.com/api/v4/projects?private_token=<your_access_token>"

Example of using the personal, project, or group access token in a header:

curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects"

You can also use personal, project, or group access tokens with OAuth-compliant headers:

curl --header "Authorization: Bearer <your_access_token>" "https://gitlab.example.com/api/v4/projects"

Session cookie

Signing in to the main GitLab application sets a _gitlab_session cookie. The API uses this cookie for authentication if it’s present. Using the API to generate a new session cookie isn’t supported.

The primary user of this authentication method is the web frontend of GitLab itself. The web frontend can use the API as the authenticated user to get a list of projects without explicitly passing an access token.

Impersonation tokens

Impersonation tokens are a type of personal access token. They can be created only by an administrator, and are used to authenticate with the API as a specific user.

Use impersonation tokens as an alternative to:

• The user’s password or one of their personal access tokens.
• The Sudo feature. The user’s or administrator’s password or token may not be known, or may change over time.

For more information, see the users API documentation.

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

By default, impersonation is enabled. To disable impersonation:

For Omnibus installations

1. Edit the /etc/gitlab/gitlab.rb file:

   gitlab_rails['impersonation_enabled'] = false
   

2. Save the file, and then reconfigure GitLab for the changes to take effect.

To re-enable impersonation, remove this configuration, and then reconfigure GitLab.

For installations from source

1. Edit the config/gitlab.yml file:

   gitlab:
     impersonation_enabled: false
   

2. Save the file, and then restart GitLab for the changes to take effect.

To re-enable impersonation, remove this configuration, and then restart GitLab.

Sudo

All API requests support performing an API request as if you were another user, provided you’re authenticated as an administrator with an OAuth or personal access token that has the sudo scope. The API requests are executed with the permissions of the impersonated user.

As an administrator, pass the sudo parameter either by using query string or a header with an ID or username (case insensitive) of the user you want to perform the operation as. If passed as a header, the header name must be Sudo.

If a non administrative access token is provided, GitLab returns an error message with a status code of 403:

{
  "message": "403 Forbidden - Must be admin to use sudo"
}

If an access token without the sudo scope is provided, an error message is returned with a status code of 403:

{
  "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 is returned with a status code of 404:

{
  "message": "404 User with ID or username '123' Not Found"
}

Example of a valid API request and a request using cURL with sudo request, providing a username:

GET /projects?private_token=<your_access_token>&sudo=username

curl --header "PRIVATE-TOKEN: <your_access_token>" --header "Sudo: username" "https://gitlab.example.com/api/v4/projects"

Example of a valid API request and a request using cURL with sudo request, providing an ID:

GET /projects?private_token=<your_access_token>&sudo=23

curl --header "PRIVATE-TOKEN: <your_access_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, you can get insight into what went wrong.

The following table gives an overview of how the API functions generally behave.

The following table shows the possible return codes for API requests.

Pagination

GitLab supports the following pagination methods:

• Offset-based pagination. The default method and available on all endpoints.
• Keyset-based pagination. Added to selected endpoints but being progressively rolled out.

For large collections, you should use keyset pagination (when available) instead of offset pagination, for performance reasons.

Offset-based pagination

Sometimes, the returned result spans many pages. When listing resources, you can pass the following parameters:

In the following example, we list 50 namespaces per page:

curl --request GET --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/namespaces?per_page=50"

Pagination Link header

Link headers are returned with each response. They have rel set to prev, next, first, or last and contain the relevant URL. Be sure to use these links instead of generating your own URLs.

For GitLab.com users, some pagination headers may not be returned.

In the following cURL example, we limit the output to three items per page (per_page=3) and we request the second page (page=2) of comments of the issue with ID 8 which belongs to the project with ID 9:

curl --head --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/9/issues/8/notes?per_page=3&page=2"

The response is:

HTTP/2 200 OK
cache-control: no-cache
content-length: 1103
content-type: application/json
date: Mon, 18 Jan 2016 09:43:18 GMT
link: <https://gitlab.example.com/api/v4/projects/8/issues/8/notes?page=1&per_page=3>; rel="prev", <https://gitlab.example.com/api/v4/projects/8/issues/8/notes?page=3&per_page=3>; rel="next", <https://gitlab.example.com/api/v4/projects/8/issues/8/notes?page=1&per_page=3>; rel="first", <https://gitlab.example.com/api/v4/projects/8/issues/8/notes?page=3&per_page=3>; 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

GitLab also returns the following additional pagination headers:

For GitLab.com users, some pagination headers may not be returned.

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. order_by and sort are both mandatory.

In the following example, we list 50 projects per page, ordered by id ascending.

curl --request GET --header "PRIVATE-TOKEN: <your_access_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/1.1 200 OK
...
Link: <https://gitlab.example.com/api/v4/projects?pagination=keyset&per_page=50&order_by=id&sort=asc&id_after=42>; rel="next"
Status: 200 OK
...

The link to the next page contains an additional filter id_after=42 that excludes already-retrieved records.

As another example, the following request lists 50 groups per page ordered by name ascending using keyset pagination:

curl --request GET --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/groups?pagination=keyset&per_page=50&order_by=name&sort=asc"

The response header includes a link to the next page:

HTTP/1.1 200 OK
...
Link: <https://gitlab.example.com/api/v4/groups?pagination=keyset&per_page=50&order_by=name&sort=asc&cursor=eyJuYW1lIjoiRmxpZ2h0anMiLCJpZCI6IjI2IiwiX2tkIjoibiJ9>; rel="next"
Status: 200 OK
...

The link to the next page contains an additional filter cursor=eyJuYW1lIjoiRmxpZ2h0anMiLCJpZCI6IjI2IiwiX2tkIjoibiJ9 that excludes already-retrieved records.

The type of filter depends on the order_by option used, and we can have more than one additional filter.

When the end of the collection is reached and there are no additional records to retrieve, the Link header is absent and the resulting array is empty.

You should use 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.

Supported resources

Keyset-based pagination is supported only for selected resources and ordering options:

Pagination response headers

For performance reasons, if a query returns more than 10,000 records, GitLab doesn’t return the following headers:

• x-total.
• x-total-pages.
• rel="last" link

Path parameters

If an endpoint has path parameters, the documentation displays them with a preceding colon.

For example:

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 : shouldn’t be included.

The resulting cURL request for a project with ID 5 and a group ID of 17 is then:

curl --request DELETE --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/5/share/17"

Path parameters that are required to be URL-encoded must be followed. If not, it doesn’t match an API endpoint and responds with a 404. If there’s something in front of the API (for example, Apache), ensure that it doesn’t decode the URL-encoded path parameters.

Namespaced path encoding

If using namespaced API requests, make sure that the NAMESPACE/PROJECT_PATH is URL-encoded.

For example, / is represented by %2F:

GET /api/v4/projects/diaspora%2Fdiaspora

A project’s path isn’t necessarily the same as its name. A project’s path is found in the project’s URL or in the project’s settings, under General > Advanced > Change path.

File path, branches, and tags name encoding

If a file path, branch or tag contains a /, make sure it is URL-encoded.

For example, / is represented by %2F:

GET /api/v4/projects/1/repository/files/src%2FREADME.md?ref=master
GET /api/v4/projects/1/branches/my%2Fbranch/commits
GET /api/v4/projects/1/repository/tags/my%2Ftag

Request Payload

API Requests can use parameters sent as query strings or as a payload body. GET requests usually send a query string, while PUT or POST requests usually send the payload body:

• Query string:

  curl --request POST "https://gitlab/api/v4/projects?name=<example-name>&description=<example-description>"
  

• Request payload (JSON):

  curl --request POST --header "Content-Type: application/json" \
       --data '{"name":"<example-name>", "description":"<example-description>"}' "https://gitlab/api/v4/projects"
  

URL encoded query strings have a length limitation. Requests that are too large result in a 414 Request-URI Too Large error message. This can be resolved by using a payload body instead.

Encoding API parameters of array and hash types

You can request the API with array and hash types parameters:

array

import_sources is a parameter of type array:

curl --request POST --header "PRIVATE-TOKEN: <your_access_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:

curl --request POST --header "PRIVATE-TOKEN: <your_access_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' }]:

curl --globoff --request POST --header "PRIVATE-TOKEN: <your_access_token>" \
"https://gitlab.example.com/api/v4/projects/169/pipeline?ref=master&variables[0][key]=VAR1&variables[0][value]=hello&variables[1][key]=VAR2&variables[1][value]=world"

curl --request POST --header "PRIVATE-TOKEN: <your_access_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, merge requests, and project milestones. The fields are:

• id: ID that is unique across all projects.
• iid: Additional, internal ID (displayed in the web UI) that’s unique in the scope of a single project.

If a resource has both 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 request to retrieve the issue is GET /projects/42/issues/5.
• An invalid API request to retrieve the issue is GET /projects/42/issues/46.

Not all resources with the iid field are fetched by iid. For guidance regarding which field to use, see the documentation for the specific resource.

null vs false

In API responses, some boolean fields can have null values. A null boolean has no default value and is neither true nor false. GitLab treats null values in boolean fields the same as false.

In boolean arguments, you should only set true or false values (not null).

Data validation and error reporting

When working with the API you may encounter validation errors, in which case the API returns an HTTP 400 error.

Such errors appear in the following cases:

• A required attribute of the API request is missing (for example, the title of an issue isn’t given).
• An attribute did not pass the validation (for example, the user bio is too long).

When an attribute is missing, you receive something like:

HTTP/1.1 400 Bad Request
Content-Type: application/json
{
    "message":"400 (Bad request) \"title\" not given"
}

When a validation error occurs, error messages are different. They hold all details of validation errors:

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:

{
    "message": {
        "<property-name>": [
            "<error-message>",
            "<error-message>",
            ...
        ],
        "<embed-entity>": {
            "<property-name>": [
                "<error-message>",
                "<error-message>",
                ...
            ],
        }
    }
}

Unknown route

When you attempt to access an API URL that doesn’t exist, you receive a 404 Not Found message.

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 that causes a + to be interpreted as a space. For example, in an ISO 8601 date, you may want to include a specific time in ISO 8601 format, such as:

2017-10-17T23:11:13.000+05:30

The correct encoding for the query parameter would be:

2017-10-17T23:11:13.000%2B05:30

Clients

Many unofficial GitLab API Clients are available for most of the popular programming languages. For a complete list, see the GitLab website.

Rate limits

For administrator documentation on rate limit settings, see Rate limits. To find the settings that are specifically used by GitLab.com, see GitLab.com-specific rate limits.

Content type

The GitLab API supports the application/json content type by default, though some API endpoints also support text/plain.

In GitLab 13.10 and later, API endpoints do not support text/plain by default, unless it’s explicitly documented.

Resolve requests detected as spam

REST API requests can be detected as spam. If a request is detected as spam and:

• A CAPTCHA service is not configured, an error response is returned. For example:

  {"message":{"error":"Your snippet has been recognized as spam and has been discarded."}}
  

• A CAPTCHA service is configured, you receive a response with:
  • needs_captcha_response set to true.
  • The spam_log_id and captcha_site_key fields set.

  For example:

  {"needs_captcha_response":true,"spam_log_id":42,"captcha_site_key":"REDACTED","message":{"error":"Your snippet has been recognized as spam. Please, change the content or solve the reCAPTCHA to proceed."}}
  

• Use the captcha_site_key to obtain a CAPTCHA response value using the appropriate CAPTCHA API. Only Google reCAPTCHA v2 is supported.
• Resubmit the request with the X-GitLab-Captcha-Response and X-GitLab-Spam-Log-Id headers set.

export CAPTCHA_RESPONSE="<CAPTCHA response obtained from CAPTCHA service>"
export SPAM_LOG_ID="<spam_log_id obtained from initial REST response>"
curl --request POST --header "PRIVATE-TOKEN: $PRIVATE_TOKEN" --header "X-GitLab-Captcha-Response: $CAPTCHA_RESPONSE" --header "X-GitLab-Spam-Log-Id: $SPAM_LOG_ID" "https://gitlab.example.com/api/v4/snippets?title=Title&file_name=FileName&content=Content&visibility=public"