Validate YAML

Validate YAML instantly with this free tool. Check for syntax errors, auto-format valid content, and get instant feedback with live updates.

Paste your input above or import a file below.
No file chosen
Supported file types: .yaml, .yml, .txt, .json, .xml, .md, .ini
Options
Pretty output on success

How to Use:

  • Paste your YAML into the YAML to Validate box or click Choose File to upload a .yaml, .yml, or compatible file.
  • Toggle Pretty output on success to automatically format valid YAML for readability.
  • Click Validate to check your YAML for errors.
  • A live status message will appear below the input box:
    • Green text means the YAML is valid.
    • Red text shows the exact error message if invalid.
  • Click Clear All to reset everything including input, file name, and status.

What Validate YAML can do:

This tool instantly checks your YAML for syntax problems and gives you a clean “Valid YAML” message if everything checks out. It also includes an option to reformat the YAML automatically using standardized indentation, so your content is both valid and readable. You get real-time feedback with each keystroke or file import. If there’s a problem, you’ll see exactly what went wrong and where. This makes it ideal for editing, debugging, and quickly confirming YAML files before committing them to production systems.

Example:

Input:
name: Alice
skills
  - YAML
  - JSON

Output:
[Error] bad indentation of a sequence entry at line 3, column 3:
    - YAML
      ^

Common Use Cases:

Perfect for validating YAML files used in Kubernetes configs, GitHub Actions, CI/CD tools, documentation systems, and API specs. It helps avoid crashes and confusion by catching format problems early.

Useful Tools & Suggestions:

Once you’ve validated your YAML, running it through Prettify YAML can clean up the formatting so it’s easier to read. Or if you’re planning to convert it, Transform YAML into JSON keeps the structure intact while making it usable in more tools.

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