docs/content/code-security/codeql-cli/using-the-codeql-cli/using-custom-queries-with-the-codeql-cli.md

title, intro, product, versions, topics

title	intro	product	versions	topics
Using custom queries with the CodeQL CLI	You can write your own {% data variables.product.prodname_codeql %} queries to find specific vulnerabilities and errors.	{% data reusables.gated-features.codeql %}	fpt ghes ghae ghec * * * *	Advanced Security Code scanning CodeQL

{% data reusables.codeql-cli.codeql-site-migration-note %}

About custom queries and the {% data variables.product.prodname_codeql_cli %}

You can customize your {% data variables.product.prodname_codeql %} analyses by writing your own queries to highlight specific vulnerabilities or errors.

This topic is specifically about writing queries to use with the database analyze command to produce interpreted results.

{% data reusables.codeql-cli.advanced-query-execution %}

Writing a valid query

Before running a custom analysis you need to write a valid query, and save it in a file with a .ql extension. There is extensive documentation available to help you write queries. For more information, see “{% data variables.product.prodname_codeql %} queries.”

Including query metadata

Query metadata is included at the top of each query file. It provides users with information about the query, and tells the {% data variables.product.prodname_codeql_cli %} how to process the query results.

When running queries with the database analyze command, you must include the following two properties to ensure that the results are interpreted correctly:

• Query identifier (@id): a sequence of words composed of lowercase letters or digits, delimited by / or -, identifying and classifying the query.

• Query type (@kind): identifies the query as a simple alert (@kind problem), an alert documented by a sequence of code locations (@kind path-problem), for extractor troubleshooting (@kind diagnostic), or a summary metric (@kind metric and @tags summary).

For more information about these metadata properties, see “Metadata for {% data variables.product.prodname_codeql %} queries” and the Query metadata style guide.

{% note %}

Note: Metadata requirements may differ if you want to use your query with other applications. For more information, see “Metadata for {% data variables.product.prodname_codeql %} queries.”

{% endnote %}

{% ifversion codeql-packs %}

Packaging custom QL queries

{% data reusables.codeql-cli.beta-note-package-management %}

When you write your own queries with the intention to share them with others, you should save them in a custom {% data variables.product.prodname_codeql %} pack. You can publish the pack as a {% data variables.product.prodname_codeql %} pack to {% data variables.product.prodname_registry %} - the {% data variables.product.prodname_dotcom %} {% data variables.product.prodname_container_registry %}. For more information, see “About {% data variables.product.prodname_codeql %} packs.”

{% data variables.product.prodname_codeql %} packs organize the files used in {% data variables.product.prodname_codeql %} analysis and can store queries, library files, query suites, and important metadata. Their root directory must contain a file named qlpack.yml. Your custom queries should be saved in the {% data variables.product.prodname_codeql %} pack root, or its subdirectories.

For each {% data variables.product.prodname_codeql %} pack, the qlpack.yml file includes information that tells the {% data variables.product.prodname_codeql_cli %} how to compile the queries, which other {% data variables.product.prodname_codeql %} packs and libraries the pack depends on, and where to find query suite definitions. For more information about what to include in this file, see “About {% data variables.product.prodname_codeql %} packs.”

{% endif %}

Contributing to the {% data variables.product.prodname_codeql %} repository

If you would like to share your query with other {% data variables.product.prodname_codeql %} users, you can open a pull request in the {% data variables.product.prodname_codeql %} repository. For more information, see Contributing to {% data variables.product.prodname_codeql %}.

Further reading

• “{% data variables.product.prodname_codeql %} queries”