JSON Validator

Check that JSON is valid and find exactly where any error is.

Runs in your browser · No uploads

Your JSON

Indentation

Sort keys alphabetically

Nothing leaves your device
No server-imposed size limits
No sign-up, no watermark
Free

How to validate JSON

Paste your JSON.
Press Validate JSON.
If there is an error, its line and column are shown and the problem is selected in the text box. Fix it and validate again.

Common JSON errors

A comma after the last item in an object or array.
Single quotes instead of double quotes around strings and keys.
Keys without quotes.
Comments, which standard JSON does not allow.
Special values such as NaN, Infinity or undefined.

Is my JSON sent anywhere?

No. Validation happens in your browser.

Frequently asked questions

Which JSON standard is used?

Standard JSON as defined in RFC 8259, the same rules web browsers use.

Is my JSON uploaded?

No. Everything stays in your browser.

Guides for this tool

Fix Invalid JSON: The 8 Most Common Errors and How to Spot Them
Find and fix the JSON mistakes that break APIs and config files: trailing commas, single quotes, comments, unquoted keys and more, with…