How to format JSON
- Paste your JSON into the input box.
- Click Format to make it readable, or Minify to make it as small as possible.
- Fix any errors using the line and column shown, then copy or download the result.
About the JSON Formatter tool
JSON is the most common format for APIs and config files, but minified JSON is hard to read and one missing comma breaks everything. Paste your data to pretty-print it with indentation and colors, check whether it's valid, or compress it to a single line. Your data is processed locally and never leaves your browser — safe for private data.
100% free
No limits, no watermarks and no sign-up.
Private
Everything runs locally in your browser — nothing is sent anywhere.
Fast
No uploading or waiting in a queue. Results in seconds.
Works everywhere
Windows, Mac, iPhone, Android and Chromebook.
Frequently asked questions
What does validating JSON mean?
It checks that your text follows the JSON rules exactly. If it doesn't, you'll see what's wrong and where.
What's the difference between Format and Minify?
Format adds line breaks and indentation so people can read it. Minify removes all extra spaces to make the file as small as possible.
Why is my JSON invalid?
The most common causes are trailing commas, single quotes instead of double quotes, and keys without quotes. The error message shows the line and column of the problem.
Is my data sent to a server?
No. Everything happens in your browser, so it's safe to use with private data.