yamllint

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Free

Open source YAML linter · runs as a script or Python module

Read 8 Oct 2026 · github.com

Configuration: It includes default and relaxed configurations and supports custom configuration files.yamllint.readthedocs.io · read 8 Oct 2026
Editor integrations: The documentation lists Vim, Neovim, Emacs, Visual Studio Code, and IntelliJ integrations.yamllint.readthedocs.io · read 8 Oct 2026
Input: It can lint individual files, directories, or YAML streams from standard input.yamllint.readthedocs.io · read 8 Oct 2026
License: The GitHub repository identifies the project license as GPL-3.0.github.com · read 8 Oct 2026
Output: It provides a parsable output format for use with tools such as editor syntax highlighting.yamllint.readthedocs.io · read 8 Oct 2026
Purpose: yamllint checks YAML syntax and issues such as duplicate keys, line length, trailing spaces, and indentation.yamllint.readthedocs.io · read 8 Oct 2026
Python module: The project provides a Python module that can be used to write custom linting tools.yamllint.readthedocs.io · read 8 Oct 2026
Rules: Its rules can be enabled, disabled, or adjusted, including whether a finding is an error or warning.yamllint.readthedocs.io · read 8 Oct 2026
Workflow integrations: The documentation describes integration with pre-commit, GitHub Actions, GitLab CI/CD, and Arcanist.yamllint.readthedocs.io · read 8 Oct 2026