JSON Validator
Check whether JSON is valid and get the exact line, column and reason when it is not — plus a quick summary of the document's shape.
Paste or type — it validates as you go
Runs entirely in your browser — nothing you paste is uploaded or stored.
About json validator
A validator answers one question quickly: will this parse? When the answer is no, the useful part is not the word "invalid" but the position and reason, so you can go straight to the character that broke it.
Alongside the verdict you get a short summary of what the document contains — its top-level type, how many keys or items it holds, and how deeply it nests — which is often enough to confirm you are looking at the payload you expected.
Good to know
- Validation runs in your browser with the native JSON parser, so the result matches exactly what your own code will do with the same string.
- JSON has no comments and no trailing commas. Both are the most common reason a file that looks correct fails to parse.
- A valid JSON document can be a single value — a string, number or boolean — not just an object or array.