在线 JSON 格式化、验证与美化工具
实时 JSON 错误检测与语法高亮
使用我们的免费在线工具格式化、验证和美化您的 JSON 数据。 并排对比，支持语法高亮与错误检测。
面向开发人员与 SEO 的专业在线 JSON 工具
格式化 JSON 以适应机器可读性与 API 集成
输入 JSON
在此粘贴未格式化的 JSON 数据
格式化 JSON
Validated and formatted JSON
实时验证
即时 JSON 验证，提供详细的错误信息和语法高亮。
下载与复制
一键下载格式化的 JSON 文件或复制到剪贴板。
可自定义格式化
选择您首选的缩进大小（2、4 或 8 个空格）以获得一致的格式。
What is JSON Formatter & Validator?
The JSON Formatter and Validator takes raw, minified, or malformed JSON and transforms it into clean, properly indented, readable code. It validates JSON syntax with precise error locations — highlighting the exact line and character of any problem — and offers three output modes: beautified, minified, and interactive tree view. This makes it the complete browser-based tool for formatting, debugging, and exploring JSON data without needing a code editor.
JSON (JavaScript Object Notation) is the universal data format for REST APIs, configuration files, and NoSQL databases across virtually every technology stack. API responses and webhook payloads regularly arrive as dense, single-line strings that are impossible to read without formatting. The formatter transforms any JSON into readable, well-structured code in seconds.
Why Use JSON Formatter & Validator?
API responses, database exports, and configuration files regularly arrive as single-line, unformatted JSON strings. This formatter makes any JSON immediately human-readable, validates it for syntax errors before those errors break your application, and provides tree-view navigation for exploring deeply nested structures — all in seconds, directly in the browser without installing any tools.
Key Features of JSON Formatter & Validator
- ✓Beautifies JSON with configurable indentation (2 spaces, 4 spaces, or tabs)
- ✓Validates JSON syntax with precise error highlighting — shows exact line and column
- ✓Minifies JSON to the smallest possible string for production payloads
- ✓Interactive tree view for exploring nested objects and arrays
- ✓Supports JSON5 with trailing commas and inline comments
- ✓Copy to clipboard or download as a .json file
How to Use JSON Formatter & Validator
- 1
Paste your JSON
Enter raw, minified, or potentially invalid JSON into the input area.
- 2
Format or validate
Click Format to beautify, or Validate to check syntax. Invalid JSON shows the exact error location.
- 3
Review the output
See clean, indented JSON. Review any error messages with precise line and column references.
- 4
Fix errors if present
Common fixes: remove trailing commas, add double quotes around keys, close open brackets, escape backslashes in strings.
- 5
Copy or download
Copy the formatted JSON to clipboard or download as a .json file for use in your project.
Frequently Asked Questions about JSON Formatter & Validator
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