理解 JSON：格式化和验证的初学者指南
Quick Answer
JSON 是一种基于文本的数据格式，使用键值对和数组。它支持字符串、数字、布尔值、null、对象和数组。使用我们免费的 JSON 格式化器来美化、验证和最小化 JSON 数据 — 所有处理都在浏览器中完成。
Introduction
JSON（JavaScript 对象表示法）是一种轻量级数据交换格式，易于人类读写，易于机器解析和生成。它是 Web 服务器和浏览器之间通信最常用的数据格式，在现代 Web API 中已在很大程度上取代了 XML。
Step by Step
-
Understand JSON syntax
JSON uses curly braces {} for objects, square brackets [] for arrays, and key-value pairs separated by colons. Keys must be strings in double quotes. Values can be strings, numbers, booleans, null, objects, or arrays.
-
Format your JSON
Paste your JSON data into the JSON Formatter tool. It will automatically beautify the JSON with proper indentation and line breaks, making it easy to read.
-
Validate the structure
The formatter checks your JSON for syntax errors. If valid, it displays the formatted output. If invalid, it shows an error message indicating the problem.
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Copy or use the result
Copy the formatted JSON to your clipboard for use in your code, documentation, or debugging.
Examples
Simple object
Input: {"name":"Alice","age":30}
Output: {
"name": "Alice",
"age": 30
}
Array of objects
Input: [{"id":1},{"id":2}]
Output: [
{ "id": 1 },
{ "id": 2 }
]
Nested structure
Input: {"user":{"name":"Bob","tags":["admin","user"]}}
Output: {
"user": {
"name": "Bob",
"tags": ["admin", "user"]
}
}
Common Problems
- Using single quotes for strings —JSON requires double quotes for strings and keys.
- Trailing commas —JSON does not allow a comma after the last item in an object or array.
- Comments —JSON does not support comments (// or /* */). Use JSONC or JSON5 if you need comments.
- Unquoted keys —all keys must be in double quotes, unlike JavaScript object literals.
Tips
- Use a JSON formatter to catch syntax errors before sending data to an API.
- Minified JSON saves bandwidth —use minification in production, formatting in development.
- JSON does not support undefined, functions, or dates as values —use null or ISO 8601 strings.
- Use JSON.parse() in JavaScript to convert JSON strings to objects, and JSON.stringify() to convert objects to JSON.