Paste JSON to format, prettify and validate — all processing done locally in your browser
等待输入...Waiting for input...
💡 本地处理 · 隐私安全💡 Local Processing · Privacy Safe
所有数据仅在您的浏览器中处理，不会发送到任何服务器。支持格式化（2空格缩进）、
压缩（去除空白）、JSON 语法校验，以及键值对数量统计。
All data is processed locally in your browser — never sent to any server. Supports format (2-space indent),
minify (remove whitespace), syntax validation, and key-value count statistics.
How to Use This Tool使用说明
Paste your JSON data into the text area on the left.
The tool automatically validates the syntax as you type, showing a green indicator for valid JSON and an error message for invalid data.
Click Format to pretty-print with 2-space indentation, or Minify to compress by removing all whitespace.
Click Copy to copy the result to your clipboard, or Clear to reset.
The status bar shows character count and key count for quick reference.
将 JSON 数据粘贴到左侧文本区域。
工具会在输入时自动校验语法，有效 JSON 显示绿色指示器，无效数据则显示错误信息。
点击 Format 以 2 空格缩进美化显示，或点击 Minify 压缩去除所有空白。
点击 Copy 复制结果到剪贴板，或点击 Clear 清空。
状态栏显示字符数和键值对数量，方便快速查看。
Frequently Asked Questions常见问题
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 widely used in web APIs, configuration files, and data storage.
Is my data sent to a server? — No. All JSON formatting and validation happens entirely in your browser using JavaScript. Your data never leaves your device.
What causes "Unexpected token" errors? — This error means the JSON syntax is invalid. Common causes include missing commas between key-value pairs, trailing commas after the last item, using single quotes instead of double quotes, or unescaped special characters.
Can I format very large JSON files? — The tool can handle JSON files up to several MB in size. Extremely large files (50MB+) may cause browser slowdown. For those, consider using a command-line tool like jq.
What is JSON minification? — Minification removes all unnecessary whitespace (spaces, newlines, tabs) from JSON, making it more compact for transmission over networks while remaining fully functional.
什么是 JSON？ — JSON（JavaScript Object Notation）是一种轻量级数据交换格式，易于人类阅读和编写，也易于机器解析和生成。广泛应用于 Web API、配置文件和数据存储。