JSON Formatter & Validator
Paste your JSON to beautify, minify, or check it for errors — with a clear message and exact line when something's off.
About this tool
Everything you need to clean up and check JSON — no sign-up, no upload.
Beautify
Turn a minified blob into neatly indented, readable JSON. Choose 2 spaces, 4 spaces, or tabs.
Minify
Strip every space and line break to make the smallest valid JSON — perfect for APIs and configs.
Validate
Instantly check if your JSON is valid. If not, we point to the exact line and column of the problem.
How it works
This tool uses your browser's built-in JSON engine to parse and re-serialize your text. Beautify re-indents valid JSON so it's easy to read. Minify removes all unnecessary whitespace to produce the most compact valid JSON. Validate checks the syntax and, when something's wrong, translates the error into a plain-English message plus the line and column where parsing failed — so you can jump straight to the typo (a stray comma, a missing quote, an unclosed bracket).
Because it all runs on your machine, nothing you paste is ever sent anywhere. That makes it safe
for API keys, private payloads, and anything else you'd rather not upload. Use Copy
to grab the result, or Download to save it as a .json file.
Private by design. All formatting happens right here in your browser — your JSON is never uploaded, and we never see it.
Frequently Asked Questions
What's the difference between Beautify and Minify? ▼
Does it tell me where my JSON is broken? ▼
Can I choose the indentation? ▼
Will formatting change my data? ▼
Can I copy or download the result? ▼
.json file.