JSON Formatter & Validator

Free online JSON formatter, beautifier and validator. Format, validate and minify JSON in your browser.

Paste your JSON here...

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What is a JSON Formatter?

A JSON formatter is an online tool that automatically formats, beautifies, and validates JSON (JavaScript Object Notation) data. JSON is the most widely used data exchange format in web development, APIs, and configuration files. Our free JSON formatter helps developers read, debug, and optimize JSON data instantly — all processing happens directly in your browser for maximum privacy and speed.

JSON Formatter Features

Format & Beautify

Transform minified JSON into clean, human-readable indented output

Syntax Validation

Instantly detect JSON syntax errors with line and column numbers

Minify JSON

Compress formatted JSON to the smallest possible size for production

Visual Tree View

Browse JSON structure as an interactive collapsible tree

JSON Examples

Before (Minified)

{"name":"John","age":30,"city":"New York","hobbies":["reading","coding"],"active":true}

After (Formatted)

{
  "name": "John",
  "age": 30,
  "city": "New York",
  "hobbies": [
    "reading",
    "coding"
  ],
  "active": true
}

How to Format JSON

  1. 1

    Paste your JSON data into the input editor above

  2. 2

    Click the "Format" button to beautify your JSON

  3. 3

    View the formatted output in the output panel on the right

  4. 4

    Use "Copy" or "Download" to save the formatted JSON

Frequently Asked Questions

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 the most common format for API responses, configuration files, and data storage in modern web development.

How do I validate JSON?

Simply paste your JSON into the input editor and click the "Validate" button. The tool will instantly check for syntax errors and display any issues with exact line and column numbers. You can also click "Format" — if the JSON is invalid, the tool will show you where the error occurs.

What is the difference between formatting and minifying?

Formatting (or beautifying) adds proper indentation and line breaks to make JSON more readable for humans. Minifying removes all unnecessary whitespace to create the smallest possible JSON string, which is ideal for production environments to reduce data transfer size.

Is my JSON data sent to a server?

No. All formatting, validation, and minification happens entirely in your browser using JavaScript. Your JSON data never leaves your device — we do not upload, store, or share any data. Your privacy is fully protected.