YAML Validator
Validate YAML syntax
YAML Validator is a free online tool from BrowserUtils that validate yaml syntax. It runs entirely in your browser — your data never leaves your device. No account required.
How to use YAML Validator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About YAML Validator
Free online YAML validator. Check your YAML syntax for errors including indentation issues, tab characters, unbalanced quotes, and invalid structures. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
YAML Validator specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How do I validate YAML?
Paste your YAML content into the input field. The validator checks for common syntax errors including tab characters (not allowed in YAML), unbalanced quotes, unbalanced brackets in flow mappings, and invalid directives.
What YAML errors does it detect?
The validator detects tab characters, unbalanced quotes and brackets, duplicate colons in unquoted keys, invalid flow mappings and sequences, and unterminated multiline strings.
Is the YAML validator safe for config files with secrets?
Yes, all validation happens in your browser. No YAML content is sent to any server, so files containing passwords or API keys stay private.
Does the YAML validator work offline?
Once the page is loaded, the validator runs entirely in the browser with no network requests. You can validate YAML files without an internet connection.
How is the YAML validator different from a YAML formatter?
The validator checks for syntax errors and reports problems with line numbers. A formatter assumes valid input and reformats it with consistent indentation and style.
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