About Just Formatter

Just Formatter is a lightweight, developer-focused online tool designed to help you format, validate, and beautify structured data like JSON and JWTs effortlessly.

Whether you are debugging an API response, inspecting token claims, or simply trying to make sense of nested data — our tools help you visualize, validate, and work with your data efficiently. We focus on simplicity, speed, and privacy: all processing happens in your browser.

Our Core Principles

•No data leaves your browser
•Zero configuration required
•Keyboard-friendly workflows

Key Features

✓JSON formatting with syntax highlighting

✓JWT decoding with header/payload view

✓Collapse/expand nested structures

✓Copy formatted output with one click

✓Light/dark theme support

✓Mobile-responsive design

Who Built This?

Just Formatter was created by developers who were frustrated with clunky, ad-filled formatters. We built the tool we wanted to use ourselves — fast, clean, and privacy-focused.

Get Involved

This is an open-source friendly project. We welcome contributions and feedback!