Developer Tool
JSON Formatter & Validator 📋

Format, beautify, minify, and validate JSON instantly. Paste raw or minified JSON and get a clean, readable, indented output with error detection.

Indent:
⬤ Paste JSON to validate
📋 How To Use
1
Paste your JSON. Enter or paste your raw, minified, or already-formatted JSON into the input box. The validator runs live as you type, showing a green or red status indicator.
2
Choose an action. Click Format to beautify with readable indentation, Minify to compress to a single line, Validate to check for errors, or Sort Keys to alphabetically sort all object keys.
3
Select your indent size. Use the indent dropdown to choose 2 spaces (default), 4 spaces, 1 space, or tabs for formatted output.
4
Copy the result. Click Copy Result to copy the formatted JSON to clipboard. Use Load Sample to try the formatter with example data.
⚙️ Features Explained
✨
Format / Beautify
Parses your JSON and outputs it with proper indentation, line breaks, and spacing. Makes dense minified JSON instantly human-readable for debugging and review.
⚡
Minify
Removes all unnecessary whitespace, spaces, and line breaks to produce the smallest possible valid JSON string. Reduces file size for API responses and production payloads.
✓
Real-Time Validation
As you type, the tool continuously validates your JSON. The status bar turns green for valid JSON and red for invalid, with a specific error message pointing to the issue.
⬆
Sort Keys
Alphabetically sorts all object keys at every nesting level. Useful for comparing JSON objects, standardizing API responses, and making keys easier to find in large payloads.
❓ Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It uses human-readable syntax to represent data as key-value pairs, arrays, strings, numbers, booleans, and null values. JSON is the standard format for REST APIs, configuration files, and data storage across virtually all modern programming languages and platforms.
Common JSON errors include: missing or extra commas between items, single quotes used instead of double quotes (JSON requires double quotes for all strings and keys), trailing commas after the last item in an object or array, unquoted keys, undefined or NaN values (not valid JSON), and mismatched brackets or braces. The error message from this tool points to the specific location of the problem.
JSON is a text format derived from JavaScript object syntax, but with stricter rules. Unlike JavaScript objects: all keys must be double-quoted strings in JSON (not bare words), values cannot be functions, undefined, or NaN, trailing commas are not allowed, and single quotes are never valid. JSON can be parsed by any programming language, while JavaScript objects exist only in JavaScript runtime environments.
No. All JSON formatting, validation, and processing happens entirely in your browser using JavaScript. Your JSON data never leaves your device and is never sent to any server. This makes it safe to use with sensitive data like API responses containing private keys or personal information — though we recommend never sharing sensitive credentials in any tool unnecessarily.
Yes. This is one of the most common use cases. When you fetch data from an API (in a browser DevTools network tab, Postman, or curl), the response JSON is often minified. Simply copy the raw JSON response and paste it here. Click Format to instantly make it readable, and Validate to confirm it is well-formed JSON before processing it in your code.
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