JSON Formatter & Validator
Format, prettify, and validate your JSON data. Secure, client-side processing.
Input JSON
Output
The Ultimate JSON Formatter & Validator
Stop struggling with messy, unreadable JSON data. Our Free JSON Formatter is the perfect tool for developers, data analysts, and students who need to debug, validate, and prettify JSON code instantly.
Unlike other tools that send your possibly sensitive data to a remote server for processing, OpenToolbox performs 100% of the logic right here in your browser. This means your API keys, user data, and configuration files never leave your device.
Whether you are debugging an API response, minifying a payload for production, or just trying to read a massive configuration file, we've exactly what you need.
Key Features
- 🔒 100% Client-Side Privacy: Your data never leaves your browser.
- ⚡ Instant Validation: Detects syntax errors, missing quotes, and trailing commas immediately.
- 🎨 Syntax Highlighting: Beautiful, easy-to-read color coding for keys, strings, and booleans.
- 📦 Minification: Compress functionality to remove whitespace and reduce payload size.
- 📂 File Support: Copy/Paste or Load huge JSON strings without crashing.
- 🌙 Dark Mode: Easy on the eyes for late-night debugging sessions.
How to Use
Paste your raw / minified JSON code into the left 'Input' editor panels.
Click the Format / Prettify button to organize messy code into a readable tree.
Use Minify if you need to compress the data for production use.
If there are errors, check the red alert box for detailed syntax correction hints.
Once happy, click Copy or Download to save your clean JSON file.
