JSON Formatter & Validator

How to Use the JSON Formatter

This free online JSON formatter and validator helps you quickly format, validate, and minify JSON data. Simply paste your JSON into the input field and click "Format" to beautify it with proper indentation, or "Minify" to compress it into a single line.

Features

• Instant JSON formatting with customizable indentation (2 spaces, 4 spaces)
• JSON validation with clear error messages showing exactly where the issue is
• One-click minification to reduce JSON file size
• Copy formatted output to clipboard with a single click
• Works entirely in your browser - no data is ever sent to a server

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is widely used for API responses, configuration files, and data storage. Properly formatted JSON improves readability and makes debugging much easier.

Common JSON Errors

The most common JSON errors include missing commas between key-value pairs, trailing commas after the last element, using single quotes instead of double quotes, and unescaped special characters in strings. Our validator will catch all of these and show you exactly where the problem is.

JSON Formatter & Validatorの使い方

このツールはJSONデータの整形・検証・圧縮をブラウザ上で即座に実行できます。JSONを入力欄に貼り付け、「整形」ボタンでインデント付きの読みやすい形式に変換するか、「圧縮」ボタンで不要な空白を削除してファイルサイズを削減できます。構文エラーがある場合は、エラー箇所が表示されます。