JSON Validator
Validate JSON syntax and find errors free in your browser. No sign-up — your data never leaves your device.
Strictly Validate JSON Syntax
Strict JSON Validator checks your JSON against the exact specification and reports the precise location of any syntax error — a missing comma, an unescaped quote, a trailing comma — so you can fix it fast instead of guessing.
How to use
- Paste your JSON into the input box.
- Click "Validate" to check it against the JSON specification.
- Review the reported error location if the JSON is invalid.
Common use cases
- Finding the exact cause of a "malformed JSON" error from an API.
- Double-checking a config file before deploying it.
- Verifying JSON syntax before pasting it into a strict parser.
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