JSON Formatter & Validator

Beautify, minify, and validate your JSON data instantly.

Input JSON

Output

Complete Guide to JSON Formatting

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's the most common format for APIs, configuration files, and data storage in modern web applications.

How to Use This Tool

Paste your JSON: Copy your JSON data into the input field on the left.
Click Format: Beautify your JSON with proper indentation and line breaks.
Click Minify: Compress JSON by removing all whitespace (useful for APIs).
Validate: Check if your JSON is syntactically correct - errors are highlighted.
Copy Result: Copy the formatted output to your clipboard with one click.

Common JSON Syntax Rules

Keys must be strings wrapped in double quotes: "key"
String values use double quotes, not single quotes
No trailing commas after the last element in arrays or objects
Numbers don't need quotes: 42 or 3.14
Boolean values are lowercase: true or false
Null value is lowercase: null

Frequently Asked Questions

Is my data secure?

Yes! All JSON processing happens directly in your browser. Your data never leaves your device - no server uploads, no storage, complete privacy.

What's the difference between Format and Minify?

Format (beautify) adds indentation and line breaks for human readability. Minify removes all unnecessary whitespace to reduce file size - ideal for production APIs and storage.

Why is my JSON invalid?

Common issues include: trailing commas, single quotes instead of double quotes, unquoted keys, or special characters that need escaping. The validator will show you where the error occurred.

Can I format large JSON files?

Yes, this tool handles large JSON files efficiently since processing happens locally in your browser. For extremely large files (10MB+), performance depends on your device.

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