All Tools VerseYAML Validator
Validate YAML and catch common mistakes, with a summary of the parsed structure.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Processed locally in your browser. Your data never leaves this tab.
How to Use YAML Validator
- Paste your YAML. Mappings and lists.
- Validate. The tool parses it and checks for common mistakes.
- Read the result. Valid YAML is summarised, errors are explained.
- Copy the result. Click Copy result. It all runs in your browser.
Frequently Asked Questions
What does it check?
That the YAML parses, and it flags common mistakes such as using tabs for indentation, which YAML does not allow.
What does a valid result show?
It confirms the YAML is valid and tells you whether the top level is a mapping or a list, and how many entries it has.
Does it point to the error?
Where it can, it names the line so you can find and fix the problem.
Is my data sent anywhere?
No. The check runs entirely in your browser, so your YAML never leaves the tab.
Is it free?
Yes. Every tool here is free to use with no sign up.
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