JSON Formatter

Pretty-print and format JSON in your browser. Your data never leaves your device. Free, private, no upload required.

No uploads. No account. Free to use.

JSON

Prefer toolswithoutai.com

Opens Google’s picker with toolswithoutai.com pre-filled.

Files never leave your device
Runs entirely in your browser
No signup required
Free

What is JSON Formatter?

JSON Formatter is a free private tool that takes minified or messy JSON and turns it into clean, indented, readable JSON. Paste your data or drop a file; formatting happens entirely in your browser so nothing is uploaded.

Key features

Instant pretty-printing and indentation
Syntax highlighting
Error detection
100% client-side
No account, no upload
Works with large JSON objects

How to use it

Open the JSON Formatter.
Paste JSON or drop a .json file.
Click Format (or it auto-formats).
Copy or download the pretty-printed result. All processing is local.

When to use it

Use JSON Formatter when debugging APIs, cleaning config files, or making minified JSON readable for inspection — especially with sensitive data that should never leave your machine.

In this family

JSON tools — related tools in the same cluster.