Free online JSON formatter that beautifies (indents), minifies and validates JSON syntax. Everything runs in your browser — your data is never uploaded — perfect for debugging.
Developers wiring up APIs, reading backend responses or editing config files often get JSON squeezed onto one line with no indentation — basically unreadable. Formatting (beautify) adds indentation and line breaks to expose the structure; minify does the opposite, stripping whitespace to shrink the file for config or transport.
The most common JSON errors are a stray comma, a missing bracket or the wrong quotes. This tool validates as it formats and points straight at what's broken — far faster than hunting line by line, and it saves real debugging time.
If your JSON contains tokens, passwords or customer data, use a tool that runs entirely in the browser and close the tab when done, rather than pasting into a service that uploads to a server. For encoding/decoding, pair it with our Base64 and URL encoder tools.
A JSON tool is not only for prettier indentation; it helps catch structure, syntax and sensitive-data problems.
Extra commas, missing brackets and single-quoted strings are common failures. Make sure parsing succeeds before pasting back into an API, config file or admin field.
Beautify for reading and code review; minify for transport or environment variables. Do not paste minified JSON into documents that humans need to review.
If the JSON contains tokens, cookies, customer data or internal URLs, prefer a browser-local tool. Clear the input or close the tab after use.
No. All processing happens in your browser — nothing is sent to a server.
Yes, the minify option strips whitespace and line breaks to reduce size.
A few MB works fine; very large files may be limited by browser performance.