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JSON Validator — Free
Check whether your JSON is valid and pinpoint any syntax error — the validator shows the exact line and column and what was expected, so you can fix it fast. All in your browser, nothing uploaded.
Open the tool — free → 🔒 Nothing uploaded · runs in your browserHow it works
- Open the tool on the Format & Validate tab.
- Paste your JSON — it validates as you type.
- If it is invalid, read the line and column of the error.
- Fix it, then Beautify to confirm it is clean.
Why use Ajenza
- Exact error location — line and column.
- Explains what was expected (missing comma, unquoted key, etc.).
- Live validation as you type.
- Private — your JSON never leaves your device.
- Free, no sign-up, no watermark.
Frequently asked questions
How do I validate JSON online?
Open Ajenza JSON, paste your JSON, and it is validated as you type. If it is invalid, the exact line and column of the error are shown so you can fix it.
How do I find where my JSON is broken?
The validator reports the syntax error with its line and column, and describes what was expected — for example a missing comma or an unquoted key.
Is my JSON uploaded?
No — validation happens locally in your browser, so your data stays private.
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