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JSON Formatter & Validator

Format, minify, validate, and explore JSON with a collapsible tree

Syntax highlighting, upload/download, search the tree. All in your browser.

Comparing two JSON configs? Format both sides here, then use Text Diff with Semantic JSON enabled so key order alone does not show as a change.

Input JSON

1 lines • 0 chars • 0.00 KB

Output

Output will appear here

Quick Examples

Free Online JSON Formatter & Validator

Format, validate, and minify JSON data with our free online tool. Perfect for developers working with APIs, configuration files, and data structures.

Features

  • Format/Prettify JSON - Convert minified JSON to readable format
  • Minify JSON - Compress JSON for production use
  • Validate JSON - Check syntax and find errors
  • Real syntax highlighting via Prism
  • Collapsible tree view with key/value search
  • Upload .json files and download formatted output
  • Customizable indentation (2, 4, or 8 spaces)
  • 100% client-side processing
  • Error messages with line numbers
  • 100% client-side processing

How to Use

  1. Paste your JSON into the input area
  2. Click "Format" to beautify, "Minify" to compress, or "Validate" to check syntax
  3. Review the output and copy to clipboard
  4. Use the examples for quick testing

Common Use Cases

  • Format API responses for better readability
  • Validate JSON configuration files
  • Minify JSON data to reduce file size
  • Debug JSON syntax errors
  • Share formatted JSON with team members

Quick Start Guide

  1. 1Paste your JSON code into the input textarea above
  2. 2Select your preferred indent size (2, 4, or 8 spaces) from the dropdown
  3. 3Click 'Format' to beautify, 'Minify' to compress, or 'Validate' to check syntax
  4. 4Review the formatted output or validation result
  5. 5Click the 'Copy' button to copy the result to your clipboard
  6. 6Use the example buttons below for quick testing and learning

JSON Examples

Simple Object

{"name":"John","age":30,"city":"New York"}

A basic JSON object with string and number values

Nested Object

{"user":{"name":"Alice","profile":{"email":"alice@example.com","verified":true}}}

JSON with nested objects showing hierarchical data structure

Array with Objects

[{"id":1,"title":"Task 1"},{"id":2,"title":"Task 2"}]

An array containing multiple JSON objects

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Frequently Asked Questions

What is a JSON formatter?

A JSON formatter is a tool that takes unformatted or minified JSON data and converts it into a human-readable format with proper indentation and line breaks. It helps developers read and debug JSON files more easily.

Is this JSON formatter free to use?

Yes, our JSON formatter is completely free to use with no limitations. All processing happens in your browser, so your data never leaves your device.

Can I validate JSON with this tool?

Yes, you can validate JSON syntax using the 'Validate' button. The tool will check for syntax errors and provide detailed error messages if the JSON is invalid.

What's the difference between formatting and minifying JSON?

Formatting (or beautifying) JSON adds indentation and line breaks to make it readable. Minifying removes all whitespace to create the smallest possible file size, which is useful for production environments.

Is my JSON data secure?

Yes, all processing happens entirely in your browser using JavaScript. Your JSON data is never uploaded to any server, ensuring complete privacy and security.