What the JSON Formatter does
This is a free online JSON formatter that beautifies, validates, and minifies JSON right in your browser. Paste in messy, single-line, or copied-from-an-API JSON and get it back cleanly indented and readable, or squeezed down to one compact line. If the text is not valid JSON, the tool tells you exactly what broke and where, so it doubles as a quick JSON validator. It is handy for developers reading API responses, debugging config files, cleaning up log payloads, or checking that a webhook body is well formed before you ship it.
How to use the JSON Formatter
- Paste or type your JSON into the input box at the top (the placeholder shows the shape:
{"hello":"world"}). - Pick a Mode from the dropdown: Beautify for clean 2-space indentation, or Minify to strip every space and newline.
- Read the result in the output box. If the JSON has a syntax error, you will see an “Invalid JSON” message pointing at the problem instead.
- Copy the formatted output and drop it back into your code, ticket, or docs.
There are no other buttons to hunt for. Switch between Beautify and Minify as often as you like; the output updates from whatever is in the box.
Why use this one
Everything happens locally in your browser. Your JSON is never uploaded, logged, or stored, which matters when you are pasting tokens, customer records, or internal API data. It is free, needs no sign-up, and works the same on a laptop or a phone. Formatting is instant even on large objects, and the strict parser means a clean result is also a guarantee that the JSON is genuinely valid.
Tip: if Beautify returns an error, the spot it names is usually a trailing comma, a missing quote around a key, or a stray single quote where JSON wants double quotes. Fix that one character and reformat.
Working through a whole folder of JSON files at once is better suited to a desktop tool like BulkPro from the same team; this page is built for quick, one-or-two-paste jobs.
Frequently asked questions
- How do I beautify minified JSON?
- Paste the minified JSON into the input box and leave the Mode dropdown on Beautify. The tool re-indents it with 2 spaces so every key and nested object is easy to read, then copy the result from the output box.
- Does this JSON formatter validate my JSON?
- Yes. It parses the text with a strict JSON parser, so if anything is malformed you get an 'Invalid JSON' message describing the error. A clean, formatted result means your JSON is valid.
- What is the difference between Beautify and Minify mode?
- Beautify adds line breaks and 2-space indentation to make JSON human-readable. Minify removes all whitespace and newlines to produce the smallest single-line version, which is useful for sending JSON over the wire or embedding it in code.
- Is my JSON sent to a server?
- No. All parsing and formatting runs locally in your browser using JavaScript. Your JSON never leaves your device, so it is safe to paste tokens, config, or private API data.
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Last updated: June 15, 2026