JSON Formatter
Format, validate and syntax-highlight JSON online, free. Paste JSON to auto-format with error line numbers and indentation options.
// formatted JSON appears here
How to use JSON Formatter
- Paste or upload your JSON.
- Click "Format" to beautify and validate it.
- Copy or download the formatted result, or explore it in tree view.
About JSON Formatter
JSON Formatter is a free Becoderr tool. It needs no sign-up, runs fast and privately, and works right in your browser for most tasks. For the few server-based tools, your files are processed in memory and discarded immediately after the operation.
Frequently asked questions
Does it validate my JSON?
Yes, invalid JSON is flagged so you can fix syntax errors quickly.
Is my data uploaded anywhere?
No. Formatting happens entirely in your browser; your JSON never leaves your device.
Is this tool free to use?
Yes. Every tool on Becoderr is completely free with no sign-up required. Signed-in users get higher file-size limits.
Are my files safe?
Yes. Browser-based tools process files entirely on your device; nothing is uploaded. Server-based tools process files in memory and discard them immediately after the operation.
Is there a file size limit?
Server-based tools accept up to 5 MB for anonymous users and 50 MB when signed in. Browser-based tools are limited only by your device.