JSON Formatter
Format, beautify and validate JSON data online. Supports tree view, error detection, and large file processing.
All processing happens in your browser. Your data never leaves your device.
How to Use
- 1Paste your raw JSON data into the Input field on the left.
- 2Click "Format / Beautify" to format with proper indentation, or "Minify" to compact it.
- 3Copy the formatted result using the Copy button, or download it as a file.
What is JSON Formatter?
JSON Formatter is a free online tool that formats raw JSON (JavaScript Object Notation) data into a readable, indented structure. JSON is the most widely used data format for web APIs and configuration files.
Unlike other tools, JSON Formatter processes everything directly in your browser. Your data is never sent to any server, making it safe for sensitive information like API keys and tokens.
It supports JSON files up to 50MB, detects 12+ types of syntax errors with precise line numbers, and offers both beautify and minify modes.
Key Features
- Beautify JSON with customizable indentation (2 spaces, 4 spaces, or tabs)
- Minify JSON by removing all whitespace
- Validate JSON with detailed error messages and line numbers
- Supports large files up to 50MB with instant processing
- 100% client-side — no data sent to any server
- Works offline after page load
JSON Formatter vs Other Tools
| Feature | JSON Formatter | Other Tools |
|---|---|---|
| Client-side processing | Yes | Varies |
| No signup required | Yes | Often required |
| Privacy-first (no data sent) | Yes | Rarely |
| Free & unlimited | Yes | Often limited |
| No ads interruption | Yes | Often no |
FAQ
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. It's the most common format for web APIs.
Are JSON tools free?
Yes, all JSON tools are completely free. Your JSON data is processed locally and never sent to any server.
Can I validate JSON against a schema?
Yes, the JSON Schema Validator tool allows you to validate JSON data against a JSON Schema definition to ensure data structure compliance.