JSON Formatter
Beautify, validate and minify JSON with colour-coded output and error detection.
What is the JSON Formatter?
A JSON formatter takes raw or minified JSON and lays it out neatly with indentation so it is actually readable, and flags any syntax errors that would break it. Developers use it constantly — inspecting API responses, tidying config files, or debugging a payload that will not parse. This tool beautifies, validates and minifies, and everything runs in your browser, so you can safely paste data without it leaving your machine.
How to use the JSON Formatter
- Paste your JSON into the input.
- Choose Beautify to format it, or Minify to compact it.
- If there is an error, read the message to find the problem.
- Copy the clean output.
Why use Quably's JSON Formatter?
- Beautify, validate and minify in one place
- Clear error messages when JSON is invalid
- Handles large payloads
- Runs locally — data stays private
- Free, no account
Example
Beautifying an API response
A one-line JSON blob becomes indented, colour-coded and easy to scan.
Frequently asked questions
What does beautifying JSON do?
It adds indentation and line breaks so the structure is easy to read, without changing the data.
How do I know if my JSON is valid?
If it fails to parse, the tool shows an error pointing at what is wrong — a missing comma or bracket, for example.
What is minifying JSON?
Minifying strips whitespace to make the JSON as small as possible, which is useful for storing or sending it.
Is my JSON sent to a server?
No. Formatting happens entirely in your browser.