JSON Formatter & Beautifier

Beautify, minify, and validate JSON instantly. Pretty-print for readability or compress for production. All processing happens in your browser—your data never leaves your device.

Understanding JSON Formatting

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 commonly used for transmitting data in web applications, APIs, and configuration files.

Our JSON Formatter helps you beautify (pretty-print), minify (compress), and validate JSON strings. Beautifying adds indentation and line breaks to make JSON readable. Minifying removes all unnecessary whitespace to reduce file size. Validation checks whether your JSON syntax is correct.

Why Format JSON?

  • Debugging: Beautified JSON is easier to read when debugging API responses or configuration files.
  • Development: Formatted JSON improves code readability in config files like package.json or tsconfig.json.
  • API Integration: Validate JSON before sending to APIs to catch syntax errors early.
  • Production: Minified JSON reduces payload size for faster transmission over networks.
  • Documentation: Pretty-printed JSON is essential for readable API documentation.

How Our Tool Works

All formatting happens entirely in your browser. Your JSON data is never uploaded to any server. Paste your JSON, click Beautify to add indentation, Minify to compress, or Validate to check syntax. The tool supports standard JSON including objects, arrays, strings, numbers, booleans, and null values.

JSON Syntax Rules

  • Keys must be strings: Use double quotes for object keys.
  • No trailing commas: The last element in an object or array cannot be followed by a comma.
  • No comments: JSON does not support comments (unlike JSONC).
  • Valid values: Strings, numbers, booleans, null, objects, and arrays.