Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does JSON Validator do?
It checks whether a block of JSON is syntactically valid, with a clear error message pointing to the problem.
How do I use it?
Paste your JSON — a validity result and, if invalid, an explanation of the error appears instantly.
Is my input sent anywhere?
Everything runs in your browser — nothing you type or paste is sent to a server.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "JSON Validator" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.