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---
stage: Verify
group: Pipeline Authoring
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
---
# CI Lint API **(FREE ALL)**
## Validate the CI/CD configuration for a namespace
Checks if CI/CD YAML configuration is valid. This endpoint has namespace
specific context.
```plaintext
POST /projects/:id/ci/lint
```
| Attribute | Type | Required | Description |
|----------------|---------|----------|-------------|
| `content` | string | Yes | The CI/CD configuration content. |
| `dry_run` | boolean | No | Run [pipeline creation simulation](../ci/lint.md#simulate-a-pipeline), or only do static check. Default: `false`. |
| `include_jobs` | boolean | No | If the list of jobs that would exist in a static check or pipeline simulation should be included in the response. Default: `false`. |
| `ref` | string | No | When `dry_run` is `true`, sets the branch or tag context to use to validate the CI/CD YAML configuration. Defaults to the project's default branch when not set. |
Example request:
```shell
curl --header "Content-Type: application/json" "https://gitlab.example.com/api/v4/projects/:id/ci/lint" --data '{"content": "{ \"image\": \"ruby:2.6\", \"services\": [\"postgres\"], \"before_script\": [\"bundle install\", \"bundle exec rake db:create\"], \"variables\": {\"DB_NAME\": \"postgres\"}, \"types\": [\"test\", \"deploy\", \"notify\"], \"rspec\": { \"script\": \"rake spec\", \"tags\": [\"ruby\", \"postgres\"], \"only\": [\"branches\"]}}"}'
```
Example responses:
- Valid configuration:
```json
{
"valid": true,
"merged_yaml": "---\n:test_job:\n :script: echo 1\n",
"errors": [],
"warnings": []
}
```
- Invalid configuration:
```json
{
"valid": false,
"merged_yaml": "---\n:test_job:\n :script: echo 1\n",
"errors": [
"jobs config should contain at least one visible job"
],
"warnings": []
}
```
## Validate a project's CI configuration
> `sha` attribute [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/369212) in GitLab 16.5.
Checks if a project’s `.gitlab-ci.yml` configuration in a given commit
(by default `HEAD` of the project’s default branch) is valid. This
endpoint uses all namespace specific data available, including variables
and local includes.
```plaintext
GET /projects/:id/ci/lint
```
| Attribute | Type | Required | Description |
|----------------|---------|----------|-------------|
| `dry_run` | boolean | No | Run pipeline creation simulation, or only do static check. |
| `include_jobs` | boolean | No | If the list of jobs that would exist in a static check or pipeline simulation should be included in the response. Default: `false`. |
| `ref` | string | No | When `dry_run` is `true`, sets the branch or tag context to use to validate the CI/CD YAML configuration. Defaults to the project's default branch when not set. |
| `sha` | string | No | The commit SHA of a branch or tag. Defaults to the SHA of the head of the project's default branch when not set. |
Example request:
```shell
curl "https://gitlab.example.com/api/v4/projects/:id/ci/lint"
```
Example responses:
- Valid configuration:
```json
{
"valid": true,
"merged_yaml": "---\n:test_job:\n :script: echo 1\n",
"errors": [],
"warnings": []
}
```
- Invalid configuration:
```json
{
"valid": false,
"merged_yaml": "---\n:test_job:\n :script: echo 1\n",
"errors": [
"jobs config should contain at least one visible job"
],
"warnings": []
}
```
## Use jq to create and process YAML & JSON payloads
To `POST` a YAML configuration to the CI Lint endpoint, it must be properly escaped and JSON encoded.
You can use `jq` and `curl` to escape and upload YAML to the GitLab API.
### Escape YAML for JSON encoding
To escape quotes and encode your YAML in a format suitable for embedding within
a JSON payload, you can use `jq`. For example, create a file named `example-gitlab-ci.yml`:
```yaml
.api_test:
rules:
- if: $CI_PIPELINE_SOURCE=="merge_request_event"
changes:
- src/api/*
deploy:
extends:
- .api_test
rules:
- when: manual
allow_failure: true
script:
- echo "hello world"
```
Next, use `jq` to escape and encode the YAML file into JSON:
```shell
jq --raw-input --slurp < example-gitlab-ci.yml
```
To escape and encode an input YAML file (`example-gitlab-ci.yml`), and `POST` it to the
GitLab API using `curl` and `jq` in a one-line command:
```shell
jq --null-input --arg yaml "$(<example-gitlab-ci.yml)" '.content=$yaml' \
| curl "https://gitlab.com/api/v4/ci/lint?include_merged_yaml=true" \
--header 'Content-Type: application/json' \
--data @-
```
### Parse a CI Lint response
To reformat the CI Lint response, you can use `jq`. You can pipe the CI Lint response to `jq`,
or store the API response as a text file and provide it as an argument:
```shell
jq --raw-output '.merged_yaml | fromjson' <your_input_here>
```
Example input:
```json
{"status":"valid","errors":[],"merged_yaml":"---\n:.api_test:\n :rules:\n - :if: $CI_PIPELINE_SOURCE==\"merge_request_event\"\n :changes:\n - src/api/*\n:deploy:\n :rules:\n - :when: manual\n :allow_failure: true\n :extends:\n - \".api_test\"\n :script:\n - echo \"hello world\"\n"}
```
Becomes:
```yaml
:.api_test:
:rules:
- :if: $CI_PIPELINE_SOURCE=="merge_request_event"
:changes:
- src/api/*
:deploy:
:rules:
- :when: manual
:allow_failure: true
:extends:
- ".api_test"
:script:
- echo "hello world"
```
With a one-line command, you can:
1. Escape the YAML
1. Encode it in JSON
1. POST it to the API with curl
1. Format the response
```shell
jq --null-input --arg yaml "$(<example-gitlab-ci.yml)" '.content=$yaml' \
| curl "https://gitlab.com/api/v4/ci/lint?include_merged_yaml=true" \
--header 'Content-Type: application/json' --data @- \
| jq --raw-output '.merged_yaml | fromjson'
```
|
