Paste JSON to format, beautify, minify or validate it instantly, with the exact line and column of any error. Runs entirely in your browser — nothing is uploaded.
Valid JSON · 123 bytes · object
No. Formatting and validation happen in your browser with JavaScript's built-in JSON parser, so private data never leaves your device.
It removes all whitespace and line breaks, producing the smallest valid JSON — useful for payloads and config values.
The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. The error message points to the line and column.