JSON Formatter & Validator

Format, validate, and minify JSON data with syntax highlighting. All processing happens in your browser.

Input JSON
Press Ctrl+Enter to format
Output
How to Use
Format

Beautify your JSON with proper indentation and line breaks for better readability.

Minify

Compress JSON by removing whitespace. Useful for reducing file size.

Validate

Check if your JSON is valid and get detailed error messages if not.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of JavaScript and is language-independent.

Key Features of JSON:
  • Human-readable: JSON uses a simple text format that is easy to understand
  • Lightweight: Minimal syntax makes JSON efficient for data transfer
  • Language-independent: Supported by virtually all programming languages
  • Hierarchical: Supports nested objects and arrays for complex data structures
JSON Data Types:
  • String - Text in double quotes: "hello"
  • Number - Integer or floating point: 42, 3.14
  • Boolean - true or false
  • null - Empty value
  • Object - Key-value pairs: {"key": "value"}
  • Array - Ordered list: [1, 2, 3]
Frequently Asked Questions

Yes, absolutely! All JSON processing happens entirely in your browser using JavaScript. Your data is never sent to our servers, ensuring complete privacy and security.

Format (or "beautify") adds proper indentation and line breaks to make JSON human-readable. Minify removes all unnecessary whitespace to reduce file size, which is useful for production environments or API responses.

Common JSON errors include:
  • Missing or extra commas
  • Unquoted keys (keys must be in double quotes)
  • Single quotes instead of double quotes
  • Trailing commas after the last element
  • Unescaped special characters in strings

Since processing happens in your browser, the limit depends on your device's available memory. Most modern browsers can handle JSON files of several megabytes without issues.