JSON Validator

Check a block of JSON for syntax errors and get a straight yes or no, with the position of the first problem when there is one.

Your text

empty

Result

empty

How to use it

Input

{"name":"Utiloot","tools":93,}

Result

✗ Invalid JSON: Expected double-quoted property name in JSON at position 29 (line 1 column 30)

Does it check my data against a schema?

No. It checks the syntax only — whether the text is parseable JSON at all.

Is my text sent to a server?

No. This tool runs entirely in your browser — nothing you type or paste is uploaded, logged or stored anywhere.

Is there a limit on how much text I can use?

There is no fixed limit. Very large documents depend on your device’s memory, but ordinary pages and files are handled instantly.