yamllint

A linter for YAML files.

yamllint does not only check for syntax validity, but for weirdnesses like key repetition and cosmetic problems such as lines length, trailing spaces, indentation, etc.

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Written in Python (compatible with Python 3 only).

Documentation

https://yamllint.readthedocs.io/

Overview

Screenshot ^^^^^^^^^^

.. image:: docs/screenshot.png :alt: yamllint screenshot

Installation ^^^^^^^^^^^^

Using pip, the Python package manager:

.. code:: bash

pip install --user yamllint

yamllint is also packaged for all major operating systems, see installation examples (dnf, apt-get...) in the documentation <https://yamllint.readthedocs.io/en/stable/quickstart.html>_.

Usage ^^^^^

.. code:: bash

Lint one or more files

yamllint my_file.yml my_other_file.yaml ...

.. code:: bash

Lint all YAML files in a directory

yamllint .

.. code:: bash

Use a pre-defined lint configuration

yamllint -d relaxed file.yaml

Use a custom lint configuration

yamllint -c /path/to/myconfig file-to-lint.yaml

.. code:: bash

Output a parsable format (for syntax checking in editors like Vim, emacs...)

yamllint -f parsable file.yaml

Read more in the complete documentation! <https://yamllint.readthedocs.io/>__

Features ^^^^^^^^

Here is a yamllint configuration file example:

.. code:: yaml

extends: default

rules:

80 chars should be enough, but don't fail if a line is longer

line-length: max: 80 level: warning

don't bother me with this rule

indentation: disable

Within a YAML file, special comments can be used to disable checks for a single line:

.. code:: yaml

This line is waaaaaaaaaay too long # yamllint disable-line

or for a whole block:

.. code:: yaml

yamllint disable rule:colons

• Lorem : ipsum dolor : sit amet, consectetur : adipiscing elit

  yamllint enable

Specific files can be ignored (totally or for some rules only) using a .gitignore-style pattern:

.. code:: yaml

For all rules

ignore: | .dont-lint-me.yaml /bin/ !/bin/.lint-me-anyway.yaml

rules: key-duplicates: ignore: | generated .template.yaml trailing-spaces: ignore: | .ignore-trailing-spaces.yaml /ascii-art/*

Read more in the complete documentation! <https://yamllint.readthedocs.io/>__

License

GPL version 3 <LICENSE>_