FREE · DEVELOPER TOOLS
YAML Validator and Formatter.
Validate YAML syntax, format a document or export its values as JSON.
How to use YAML Validator and Formatter
Paste your source text, choose the format or options and generate the result. Review it before copying or saving.
How it works
Validate YAML syntax, format a document or export its values as JSON. Duplicate keys and alias expansion are rejected. This checks syntax, not application-specific configuration rules.
Example
name: Sam → valid YAML and structured values
Questions about YAML Validator and Formatter
Is YAML Validator and Formatter free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Duplicate keys and alias expansion are rejected. This checks syntax, not application-specific configuration rules. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.