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YAML Validator
Validate YAML syntax and its safe JSON-compatible subset before use.
YAML
YAML
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
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How to use this tool
- Paste YAML text or choose a UTF-8 file; a chosen file takes precedence.
- Checks one YAML 1.2 document, string keys, unique mappings, bounded nesting, and supported scalar types.
- Select Process data, review the result, and download it. Use Reset to clear the working data.
Examples
name: Alice count: 9007199254740993 active: true
Limitations
YAML 1.2 core, one document, string keys, no aliases/merge keys/custom tags/infinity/NaN. 5 MiB input, 40 nesting levels, 200,000 values, 20 MiB output. Formatting removes comments and presentation.
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