JSON Validator

FAQ

Does this validate against a JSON Schema?+

No. This tool checks syntax only — brackets, quotes, commas, and value types. Use a JSON Schema validator when you need to enforce a document shape.

Why does my JSON fail with a trailing comma error?+

Standard JSON does not allow trailing commas after the last item in an object or array. Remove the extra comma or run the payload through a formatter after fixing syntax.

Can I validate a JSON fragment?+

The input must be a complete JSON value: an object, array, string, number, boolean, or null. A bare key or partial object is not valid.

What happens with empty input?+

Empty input is rejected with a clear message. Paste the JSON string you want to validate first.

Is validation done on a server?+

No. Parsing and validation run locally in your browser. Your data never leaves the device.