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YAML Validator — Syntax Check & Error Locations

Validate YAML and convert to/from JSON

YAML Input

Ctrl/⌘+S or Ctrl/⌘+Enter to run

Output

Result will appear here

This tool runs on your device — your files and inputs never go anywhere.

How to Use YAML Validator & Converter

Validate YAML and convert to/from JSON No signup, and nothing gets uploaded for most use.

  1. 1

    Paste your code, JSON, or data into the editor.

  2. 2

    Pick the transformation or validation options.

  3. 3

    Run it and inspect the results in real time.

  4. 4

    Copy the output or download it as a file.

Why you might like it

  • Nothing to upload — the work happens on your device.
  • Free with no signup, no watermarks, and no daily limits.
  • Works in any modern browser on any device — nothing to install.
  • Usually done in a few seconds, so it doesn't get in your way.
Try YAML

Frequently Asked Questions

How do I validate YAML syntax online?▾

Paste your YAML text. The parser validates indentation hierarchy and outputs equivalent JSON for verification.

Does it highlight line-specific syntax errors?▾

Yes. Error line numbers and parser messages guide you to quick fixes.

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