{ } JSON Formatter & Validator
Quick answer
This free JSON formatter pretty-prints, validates and minifies JSON entirely in your browser. If the JSON is invalid, it reports the exact error with its line and column so you can fix it fast. It also counts total object keys and nesting depth.
✅ 100% free · 🔒 Runs in your browser — files never leave your device · 🚫 No sign-up
How to use the JSON Formatter & Validator
- Paste or type your JSON into the input box.
- Choose an indentation style: 2 spaces, 4 spaces or tab.
- Click Format to beautify it, Minify to compress it, or Validate to only check it.
- If there is an error, use the reported line and column to fix the input.
- Click Copy output to copy the result to your clipboard.
Frequently asked questions
Is my JSON uploaded to a server?
No. Formatting and validation run 100% in your browser with JavaScript, so your data never leaves your device.
Why does it show a line and column for errors?
The browser JSON parser reports a character position for most syntax errors. This tool converts that position into a line and column number to help you find the mistake quickly.
What is the difference between Format and Minify?
Format adds line breaks and indentation to make JSON readable. Minify removes all unnecessary whitespace to make the JSON as small as possible, which is useful for APIs and config files.