JSON/YAML Validator

JSON/YAML Validator

Paste data on the left — get validation, formatting, and conversion on the right.
Runs entirely in your browser
Nothing you paste is uploaded
Input0 lines
1
Result
Waiting for input
Paste JSON or YAML and click “Validate & format”.
Formatted output will appear here.
JSON parsing uses your browser’s native engine. YAML parsing uses js-yaml (MIT licensed).