Yes! 100% local processing. Your JSON never leaves your device.

JSON Formatter & Validator | Beautify & Minify JSON Online

📖 JSON Formatter & Validator

JSON (JavaScript Object Notation) is a lightweight data interchange format. This tool helps you format, validate, and minify JSON data instantly. Perfect for developers working with APIs, configuration files, and data exchange.

📐 JSON Syntax Rules

Rule	✅ Correct	❌ Incorrect
Keys in double quotes	{"name":"John"}	{name:"John"}
Strings in double quotes	{"city":"Delhi"}	{city:'Delhi'}
No trailing commas	[1,2,3]	[1,2,3,]
Valid data types	String, Number, Boolean, Null, Object, Array	Undefined, Function

🔒 Privacy & Security

100% local processing - your data never leaves your device! Unlike many online tools that upload your data to servers, this JSON formatter works entirely in your browser. Perfect for sensitive data like API keys or confidential business information.

💡 How to Use

Paste JSON in the input box
Click Format to beautify with indentation (2 spaces)
Click Minify to compress for production
Click Validate to check syntax
Click Sample to load example JSON
Use Copy button to copy formatted output
Keyboard shortcuts: Ctrl+Shift+F (Format), Ctrl+Shift+M (Minify)

📊 Common Use Cases

API Development: Format API responses for debugging
Configuration Files: package.json, .eslintrc, tsconfig.json
Data Exchange: Between client and server applications
Learning JSON: Practice and validate JSON syntax

❓ Frequently Asked Questions

❓ JSON formatter vs validator? ▼

A validator checks if JSON syntax is correct. A formatter adds indentation and spacing for readability. This tool does both.

❓ Why do I get "Invalid JSON" error? ▼

Common causes: missing double quotes, trailing commas, unmatched brackets, or using single quotes instead of double quotes.

❓ Is my data secure? ▼

Yes! All processing happens locally in your browser. Your JSON data never leaves your device. No upload to any server.

❓ Can JSON have comments? ▼

No, standard JSON does not support comments. Remove all comments before validation.

❓ What keyboard shortcuts are available? ▼

Ctrl+Shift+F (Format), Ctrl+Shift+M (Minify). Works when textarea is focused.

❓ What is JSON minification? ▼

Minification removes all unnecessary spaces, indentation, and line breaks, making the file smaller for production use and API transmission.