Developer Tools
YAML Formatter & Validator
Format and validate YAML, and catch syntax errors.
Free foreverRuns in your browserNo sign-up
About the YAML Formatter & Validator
YAML is a human-friendly format for configuration and data, but its indentation-based syntax is easy to get wrong.
Paste your YAML and this tool parses it, reports any syntax error, and re-serialises it with clean, consistent indentation.
Parsing and formatting happen entirely in your browser, so your configuration never leaves your device.
Key features
- Validate YAML and report errors
- Re-indent with consistent spacing
- Handles nested maps and lists
- Runs entirely in your browser
How to use
- 1Paste your YAML.
- 2Click Format & validate.
- 3Fix any reported error, then copy the clean result.
Frequently asked questions
- What does the validator check?
- It checks that the YAML is syntactically valid and parses correctly. If not, it shows the parser error so you can fix it.
- Is my YAML uploaded?
- No. Everything runs in your browser.