YAML Lint

A simple (CLI) tool to lint YAML files

Usage

npm install --save-dev yaml-lint

const yamlLint = require('yaml-lint');

yamlLint
  .lint('test: 123')
  .then(() => {
    console.log('Valid YAML file.');
  })
  .catch((error) => {
    console.error('Invalid YAML file.', error);
  });

CLI

npm install -g yaml-lint

yamllint test.yaml

Options

YAML Lint is configured using the following options via a configuration file, environment variables, and/or command-line arguments.

First of all, YAML Lint looks for a JSON file called .yaml-lint.json within the current working directory.

{
  "schema": "CORE_SCHEMA",
  "ignore": "dir/*.yaml"
}

Afterwards, YAML Lint will take environment variables into account.

YAMLLINT_SCHEMA=CORE_SCHEMA YAMLLINT_IGNORE=dir/*.yaml yamllint

Concluding, YAML Lint will take command-line arguments into account.

yamllint --schema=CORE_SCHEMA --ignore=dir/*.yaml

(All options are merged into a single configuration using the hierarchy described above.)

schema (string)

Specifies a schema to use

• DEFAULT_SCHEMA All supported YAML types
• FAILSAFE_SCHEMA Only strings, arrays, and plain objects (http://www.yaml.org/spec/1.2/spec.html#id2802346)
• JSON_SCHEMA All JSON-supported types (http://www.yaml.org/spec/1.2/spec.html#id2803231)
• CORE_SCHEMA Same as JSON_SCHEMA (http://www.yaml.org/spec/1.2/spec.html#id2804923)

ignore (string or array of strings)

Specifies one or multiple glob patterns to ignore

yamllint **/*.(yaml|yml) --ignore=foobar.yml --ignore=dir/*.yaml

Changelog

• 1.7.0
  • Fix glob pattern to enforce forward slashes to prevent Windows issues
  • Run tests on different operating systems in CI
• 1.6.0
  • Implement support for multi-document sources
• 1.5.0
  • Add tests for CLI
• 1.4.0
  • Display all failing files instead of only the first best one
• 1.3.0
  • Migrate to TypeScript and update dependencies
• 1.2.4
  • Fix paths for ignored patterns
• 1.2.3
  • Remove nocase rule to prevent problems on Windows
• 1.2.2
  • Fix CLI support relative paths
• 1.2.1
  • Fix README
• 1.2.0
  • Add documentation regarding how to specify options
  • Update dependencies
  • Support ignoring specific files
• 1.1.0
  • Update dependencies
  • Migrate syntax to ES2015+
• 1.0.0
  • Update dependencies
  • Enable tests for Node.js 8
  • Remove support for Node.js 0.x
• 0.0.4
  • Print file names when logging YAML errors while using the CLI
• 0.0.3
  • Implement check for empty file selections while using the CLI
• 0.0.2
  • Prettier error messages within CLI
  • Add shebang for CLI
• 0.0.1
  • Initial version

License

Copyright (c) 2022 Thomas Rasshofer
Licensed under the MIT license.

See LICENSE for more info.

Contributors

• @rasshofer
• @sapegin
• @bendrucker
• @PeterDaveHello
• @poppinlp
• @AndersDJohnson