JSON Formatter

What is JSON?

JSON (JavaScript Object Notation) is the most common data format used on the web. It's human-readable, language-independent and used by virtually every API, config file and modern application. A valid JSON document contains objects {}, arrays [], strings, numbers, booleans and null.

What this tool does

• Beautify (Format): adds proper indentation and line breaks so JSON becomes easy to read.
• Minify: removes all unnecessary whitespace and line breaks to reduce file size (useful for production).
• Validate: checks whether your JSON is syntactically correct and shows the exact error location if not.
• Copy & Download: copy the result to clipboard or download it as a .json file.

Common JSON syntax rules

• Keys must be wrapped in double quotes ("key")
• Strings must use double quotes, not single quotes
• No trailing commas allowed after the last item
• No comments (unlike JavaScript)
• Numbers don't use quotes; booleans are true/false

{
  name: 'John',       // no quotes on key, single quotes
  age: 30,
  city: 'New York',   // trailing comma
}

{
  "name": "John",
  "age": 30,
  "city": "New York"
}

When to use each mode

• Beautify: when reading, debugging or editing JSON — makes structure clear.
• Minify: when sending JSON over the network or storing it — reduces size significantly.
• Validate: when you get an API error and need to know exactly where the JSON is broken.

Your privacy

All processing happens instantly in your browser. Your JSON is never sent to any server and never stored. Safe for confidential data.