How do I validate JSON?

Paste your text above. If parsing succeeds, you see Valid JSON; otherwise you see the error details.

Why is my JSON invalid?

Common causes include trailing commas, single quotes, comments, or missing braces. Strict JSON allows none of those.

Trailing commas, unquoted property names, single-quoted strings, and NaN/undefined values top the list for beginners.

Yes. This free validator works in your browser with no account and no install.

When the browser reports a position, this tool converts it to an approximate line and column so you can jump to the fault.

A free online tool that checks whether text is valid JSON for students and developers.

It calls JSON.parse in your browser and maps failure positions into line/column hints when available.

Paste JSON, optionally load a valid or broken example, and read the status panel.

Yes. It is free with no sign-up.

Yes. Mobile browsers are supported.

Free JSON Validator Online, Find Syntax Errors Fast | Binary Tech