📋 JSON Formatter & Validator

How to Use the JSON Formatter

The ZaiXian Tools JSON Formatter is a fast, privacy-first tool for working with JSON data. Whether you're debugging a messy API response, formatting a config file, or validating data structure, this tool handles it instantly —right in your browser, with zero data leaving your device.

Features

• Beautify / Pretty Print —Convert minified JSON into clean, indented, readable format with customizable indentation.
• Minify / Compress —Remove all whitespace to produce the smallest possible valid JSON.
• Validate —Check if your JSON is syntactically correct with detailed error messages showing the exact position of any issues.
• Auto-Detect —The tool automatically detects and reports JSON structure: number of keys, lines, and data size.
• Copy to Clipboard —One-click copy of formatted output for pasting into your editor or documentation.

Step-by-Step Guide

1. Paste your JSON into the input textarea. You can paste minified, malformed, or already-formatted JSON.
2. Choose an action:
   • Click "Beautify" to format with 2-space indentation
   • Click "Minify" to compress to a single line
   • Click "Validate" to check syntax without modifying the structure
3. Review the output —The status badge will show ✓Valid JSON or ✓Invalid with an error description.
4. Copy the formatted JSON to your clipboard with one click.

Example: Beautifying Minified JSON

Input (minified):

{"users":[{"id":1,"name":"Alice","active":true},{"id":2,"name":"Bob","active":false}],"total":2}

Output (beautified):

{ "users": [ { "id": 1, "name": "Alice", "active": true }, { "id": 2, "name": "Bob", "active": false } ], "total": 2 }

Common JSON Errors & How to Fix Them

• Trailing commas —JSON does not allow commas after the last item in an array or object. Remove the comma after the final element.
• Single quotes —JSON requires double quotes for strings and keys. Replace all single quotes with double quotes.
• Unquoted keys —All object keys must be double-quoted. {name: "John"} should be {"name": "John"}.
• Comments —JSON does not support comments. Remove any // or /* */ blocks.