Free Tool
JSON Formatter & Beautifier
Paste your JSON and instantly beautify, validate or minify it. Runs entirely in your browser — your data never leaves your device.
Instant Validation
Get immediate, clear error messages when your JSON has syntax issues — pinpoints exactly what went wrong.
100% Private
All formatting happens locally in your browser. No data is sent to any server, ever.
Beautify & Minify
Toggle between human-readable indented format and compact minified format in one click.
What is a JSON Formatter?
A JSON formatter (also called a JSON beautifier or JSON prettifier) takes compact or unformatted JSON data and adds proper indentation and line breaks to make it human-readable. This is essential when working with API responses, configuration files, or debugging data structures.
Our tool also validates your JSON as you format it — if your JSON has a missing bracket, extra comma, or incorrect syntax, you'll see a clear error message explaining what's wrong and where.