JSON Validator
Check if JSON is valid.
Paste JSON to check whether it is valid. Errors show the message plus the line and column where parsing failed. Everything runs locally in your browser.
Your input is processed locally in your browser — nothing is uploaded, stored or logged.
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How it works
- 1 Paste or type your JSON.
- 2 The result updates live — valid or the error location.
- 3 Fix the reported line and column if needed.
Common use cases
- Catch a stray comma or missing bracket.
- Validate an API response.
- Check config files before deploying.
- Confirm JSON before importing it.
Frequently asked questions
Is my input sent to a server?
No. Everything runs locally in your browser — your input is never uploaded, stored or logged.
Does it show where the error is?
Yes — when the browser reports a position, the tool converts it to a line and column number.
What counts as valid?
Strict JSON: double-quoted keys, no trailing commas, no comments.
Is it really free?
Yes — free, with no signup and no limits.