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---
type: reference, howto
disqus_identifier: 'https://docs.gitlab.com/ee/user/project/merge_requests/code_quality_diff.html'
---
# Code Quality **(STARTER)**
> [Introduced](https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1984) in [GitLab Starter](https://about.gitlab.com/pricing/) 9.3.
With the help of [GitLab CI/CD](../../../ci/README.md), you can analyze your
source code quality using GitLab Code Quality.
Code Quality:
- Uses [Code Climate Engines](https://codeclimate.com), which are
free and open source. Code Quality doesn't require a Code Climate
subscription.
- Runs in [pipelines](../../../ci/pipelines.md) using an Docker image built in
[GitLab Code
Quality](https://gitlab.com/gitlab-org/security-products/codequality) project.
- Can make use of a [template](#template-and-examples).
- Is available with [Auto
DevOps](../../../topics/autodevops/index.md#auto-code-quality-starter).
Going a step further, GitLab can show the Code Quality report right
in the merge request widget area:
## Use cases
For instance, consider the following workflow:
1. Your backend team member starts a new implementation for making a certain
feature in your app faster.
1. With Code Quality reports, they analyze how their implementation is impacting
the code quality.
1. The metrics show that their code degrade the quality in 10 points.
1. You ask a co-worker to help them with this modification.
1. They both work on the changes until Code Quality report displays no
degradations, only improvements.
1. You approve the merge request and authorize its deployment to staging.
1. Once verified, their changes are deployed to production.
## Template and examples
For most GitLab instances, the supplied template is the preferred method of
implementing Code Quality. See
[Analyze your project's Code Quality](../../../ci/examples/code_quality.md) for:
- Information on the builtin GitLab Code Quality template.
- Examples of manual GitLab configuration for earlier GitLab versions.
## Configuring jobs using variables
The Code Quality job supports environment variables that users can set to
configure job execution at runtime.
For a list of available environment variables, see
[Environment variables](https://gitlab.com/gitlab-org/security-products/codequality/blob/master/README.md#environment-variables).
## Implementing a custom tool
It's possible to have a custom tool provide Code Quality reports in GitLab. To
do this:
1. Define a job in your `.gitlab-ci.yml` file that generates the
[Code Quality report
artifact](../../../ci/yaml/README.md#artifactsreportscodequality-starter).
1. Configure your tool to generate the Code Quality report artifact as a JSON
file that implements subset of the [Code Climate
spec](https://github.com/codeclimate/spec/blob/master/SPEC.md#data-types).
The Code Quality report artifact JSON file must contain an array of objects
with the following properties:
| Name | Description |
| ---------------------- | -------------------------------------------------------------------------------------- |
| `description` | A description of the code quality violation. |
| `fingerprint` | A unique fingerprint to identify the code quality violation. For example, an MD5 hash. |
| `location.path` | The relative path to the file containing the code quality violation. |
| `location.lines.begin` | The line on which the code quality violation occurred. |
Example:
```json
[
{
"description": "'unused' is assigned a value but never used.",
"fingerprint": "7815696ecbf1c96e6894b779456d330e",
"location": {
"path": "lib/index.js",
"lines": {
"begin": 42
}
}
}
]
```
NOTE: **Note:**
Although the Code Climate spec supports more properties, those are ignored by
GitLab.
## Code Quality reports
Once the Code Quality job has completed, GitLab:
- Checks the generated report.
- Compares the metrics between the source and target branches.
- Shows the information right on the merge request.
If multiple jobs in a pipeline generate a code quality artifact, only the artifact from
the last created job (the job with the largest job ID) is used. To avoid confusion,
configure only one job to generate a code quality artifact.
If the Code Quality report doesn't have anything to compare to, no information
will be displayed in the merge request area. That is the case when you add the
Code Quality job in your `.gitlab-ci.yml` for the very first time.
Consecutive merge requests will have something to compare to and the Code Quality
report will be shown properly.
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