What happens if my JSON is invalid?

The tool shows the parser's exact error message so you can locate the problem, instead of failing silently.

Is there a size limit?

Formatting happens in your browser's memory, so very large files (tens of megabytes) may be slow depending on your device.

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Developer Tools

Pretty-print, minify, and validate JSON with clear error messages.

Last updated June 1, 2026

Debugging an API response

Paste a minified API payload to make nested fields readable before tracing a bug.

Shrinking a config file

Minify a JSON config before committing it to reduce file size in source control.