JSON Validator

Validate JSON syntax instantly. Check for errors and confirm your JSON is well-formed with this free online validator.

Everything runs in your browser. Your input is not sent to a server.

How to use the JSON Validator

Paste JSON into the input area.
Run Validate.
Read the success message or the error description.
Correct issues and validate again.

How it works

The validator attempts to parse the text as JSON. Success means the document is syntactically valid; failure returns a parse error so you can locate problems.

Does not check whether the data matches a specific schema—only that it is valid JSON.

Examples

{"ok": true} → valid.
{ok: true} → invalid (keys must be double-quoted).
[1, 2, 3,] → invalid trailing comma in standard JSON.

JSON Validator FAQ

Does validation check my schema?

No. It checks JSON syntax only, not business rules or JSON Schema.

Can I validate large files?

Very large inputs depend on browser memory; typical API payloads work fine.

Is the JSON Validator free?

Yes.