ValidateThis

YAML Validator

Related tools

Validators and utilities that complement YAML Validator — same session, no sign-up.

Click "Validate" to check your code

Validate YAML syntax. Paste, fetch from URL, or type. Line and column errors.

About this tool

Checks YAML syntax using js-yaml (YAML 1.2). Catches indentation errors, invalid keys, bad quotes, duplicate keys. Paste, fetch from URL, or type; use the API for automation.

How to use this tool

  1. Paste your sample in the input (or fetch from URL if this tool supports it).
  2. Run the main action on the page to execute YAML Validator.
  3. Read the result, fix the source data or config, and re-run if needed.

What this check helps you catch

  • Validate YAML syntax. Paste, fetch from URL, or type. Line and column errors.
  • Limits called out in the description (what this tool does not verify — e.g. live network reachability, issuer databases, or strict schema contracts unless stated).
  • Structural or syntax mistakes that would break parsers, serializers, or the next step in your workflow.

FAQ

What does YAML Validator do?
Validate YAML syntax. Paste, fetch from URL, or type. Line and column errors. Use the form above, then see “How to use” and “What this check helps you catch” for behavior detail.
Is this a substitute for server-side validation?
No. Use it for manual checks and triage; production systems should still validate and authorize on the server.
Where does processing happen?
Most validators here run in your browser. If a tool calls an API, that is stated on the page. See the site privacy policy for data handling.