YAMLCheck
A real YAML validator and toolkit. Check syntax, convert YAML to JSON, lint for style issues, and list top-level keys. Uses PyYAML when available, falls back to basic parsing when not.
Commands
| Command | Description |
|---|---|
yamlcheck validate <file> | Validate YAML syntax — reports document count, types, key counts, file size. Falls back to basic tab/colon checks without PyYAML |
yamlcheck to-json <file> | Convert YAML to formatted JSON output. Handles multi-document YAML files |
yamlcheck lint <file> | Check for common style issues: tabs, trailing whitespace, Windows line endings, odd indentation, missing spaces after colons, long lines |
yamlcheck keys <file> | List top-level keys with types and value previews |
Requirements
python3(required)PyYAML(optional — enables full parsing; install withpip3 install pyyaml)
Without PyYAML, the tool still works but uses basic regex-based checks instead of full YAML parsing.
Examples
# Validate a docker-compose file
yamlcheck validate docker-compose.yml
# Convert YAML config to JSON
yamlcheck to-json values.yaml
# Check for style issues
yamlcheck lint playbook.yml
# See what keys are defined
yamlcheck keys config.yaml