Free JSON Formatter & Validator

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.

Why Format JSON?

• Readability — properly indented JSON is much easier to read and debug
• Validation — catch syntax errors like missing commas, unmatched brackets, or trailing commas before they cause bugs
• Minification — remove whitespace to reduce file size for storage or transmission
• QR codes — minified JSON fits more data into a QR code
• API debugging — format API responses to quickly understand the data structure

Common JSON Syntax Errors

• Trailing commas after the last item in an array or object
• Single quotes instead of double quotes for strings
• Unquoted property names
• Missing commas between items
• Comments (JSON does not support comments)