JSON Validator

Validate JSON and see exactly which line and column has an error, with a clear message about what is wrong. Free, fast and private.

Paste JSON

How to use JSON Validator

Paste your JSON.
The status bar says instantly whether it's valid — or shows the line, column and a pointer to the error.
Press Validate & format to pretty-print it, or Auto-fix to repair common mistakes.

Runs entirely in your browser. Nothing you enter or open here is uploaded.

What are the most common JSON errors?

Trailing commas, single quotes instead of double quotes, unquoted keys, comments, and a missing closing bracket.

Is my JSON uploaded?

No. It's checked with your browser's own JSON parser.