Drag & Drop or Paste your JSON to format, validate, beautify, and minify with real-time validation
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Supports .json files
Formatted output will appear here...
Format, beautify, and validate JSON data instantly with our free online JSON Formatter. Transform minified or messy JSON into clean, properly indented, readable format with syntax highlighting. Also validates JSON syntax and shows clear error messages for invalid JSON. Essential for API development, debugging, and data analysis.
Paste your JSON data in the input area.
Click 'Format' to beautify with proper indentation.
Use 'Validate' to check for syntax errors.
Copy the formatted JSON or minify it for production.
JSON (JavaScript Object Notation) is a lightweight data interchange format used by virtually all modern web APIs. It's human-readable, language-independent, and supports objects, arrays, strings, numbers, booleans, and null values.
Common JSON errors include: trailing commas after the last item, single quotes instead of double quotes, unquoted property names, and comments (JSON doesn't support comments). Our formatter shows the exact location of errors.
JSON is stricter: property names must be double-quoted, no trailing commas allowed, no comments, no functions, and no undefined values. JavaScript objects are more flexible but JSON is the standard for data exchange.