JSON Beautifier
Format (beautify) or minify JSON instantly. Runs locally in your browser.
About this JSON Beautifier
Use this tool to beautify JSON (pretty-print / format) so it’s easier to read, or minify JSON to remove whitespace and reduce size. Everything runs locally in your browser — nothing you paste is sent to a server.
- Format API responses during debugging
- Validate JSON quickly and locate errors by line and column
- Minify JSON before storing or sending
- Hover the ❗ icon for the error details
- Choose 2 or 4 spaces for indentation depending on your style guide
FAQ
No. Formatting, minifying, and validation happen locally in your browser. Nothing you paste is sent to a server.
JSON parsers stop at the first syntax error. Fix the first reported error, then re-check to discover any additional issues.
The tool validates JSON syntax using the browser’s JSON parser and reports the error location (line and column) to help you fix it quickly.
No. Minify removes whitespace only. Keys, values, ordering, and data stay the same — it’s purely a size / formatting change.
This tool targets strict JSON. Features like comments and trailing commas are not valid JSON and will produce an error.
Yes, but extremely large payloads may be slow depending on your device and browser. If performance feels laggy, try minifying first or working with a smaller chunk.
After the page loads once, it will typically keep working if you go offline (unless you hard refresh with no cache).
Only optional UI preferences like theme/language (if you’ve implemented them). Your pasted JSON is not stored or transmitted.