JSON Validator
Runs locally
Paste JSON to instantly check whether it's syntactically valid, with an approximate location for any error found.
- Free to use
- No registration
- Runs locally in your browser
- Your data is never uploaded
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Result
Enter JSON above to validate it.
Your data is processed locally in your browser and is not uploaded.
Learn more about this tool⌄
Example
Invalid JSON is caught, not silently accepted
{"a":1, "b": [1, 2,}Invalid — "This doesn't look like valid JSON."
How it works
Validation uses the browser's native JSON.parse and reports any parsing error.
Common use cases
- Verifying hand-written JSON before deploying config
- Debugging API payloads
- Teaching JSON syntax
Frequently asked questions
- Does this check my JSON against a schema?
- No, this checks syntax only, not structure against a schema.