【JSON Formatter】Supports JSON formatting, syntax checking, auto-formatting, compression, and code folding
Input JSON
Formatted Result
Usage Instructions
Input JSON Data
Paste or input JSON text in the left input box. Supports JSON and JSONC formats, including comments.
Auto Formatting
Enable 'Auto Format' switch for real-time formatting. You can also click the 'Format' button to trigger manually.
Compression and Beautification
Click the 'Compress' button to compress JSON into one line, click again to restore beautified format. Supports one-click download of formatted files.
Code Folding
Use the fold icon to fold/unfold JSON data by level, making it easier to view the structure of large JSON files.
Fullscreen Mode
Click the fullscreen icon to toggle fullscreen mode, providing a larger editing space suitable for handling complex JSON data.
Error Tips
If the input JSON format is incorrect, detailed error information will be displayed, including error location and cause, helping to quickly locate issues.
Keyboard Shortcuts
Core Features
Smart Formatting
Automatically recognize JSON structure, provide beautiful indentation and line breaks
Real-time Validation
Instantly check JSON syntax, provide precise error location hints
One-click Compression
Quickly compress JSON into a single line, reduce file size
Code Folding
Support folding/unfolding by level, convenient for viewing large JSON
Syntax Highlighting
Different data types use different colors, improving readability
Convenient Operations
Support copy, download, fullscreen and other practical functions
JSON Introduction
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It is based on a subset of the JavaScript programming language, but its use is not limited to JavaScript. JSON is a completely language-independent text format that is easy for humans to read and write, and also easy for machines to parse and generate.
History of JSON
JSON was first proposed by Douglas Crockford in 2001. It was initially developed as a subset of JavaScript but was quickly adopted as an independent data format. In 2006, JSON was officially standardized as ECMA-404 and became ISO/IEC 21778:2017 in 2013.
JSON Features
- Lightweight: JSON format is more concise than XML, with smaller data volume
- Readability: JSON format is easy for humans to read and write
- Cross-platform: Supports multiple programming languages and platforms
- Self-describing: Clear data structure, easy to understand
- Efficient: Fast parsing and generation
JSON Data Types
Basic Types
- String
- Number
- Boolean
- Null
Composite Types
- Object
- Array
JSON Applications
Web Development
- API data exchange
- Configuration files
- Frontend-backend communication
Mobile Applications
- App configuration
- Data storage
- Server communication
Other Fields
- NoSQL databases
- Logging
- Data backup
JSON Advantages
Technical Advantages
- Fast parsing
- Simple data structure
- Support for multiple data types
- Good cross-language compatibility
Usage Advantages
- Easy to learn and use
- Rich tool support
- Active community
- Well-documented
Usage Examples
API Development
When developing APIs, you need to ensure the returned JSON data format is correct. Use this tool to quickly validate API response data.
// API response data validation
const response = await fetch('https://api.example.com/data');
const data = await response.json();
// Copy to this tool for validation
// Ensure data structure is correctConfiguration File Validation
Project configuration files need to conform to specific format requirements. Use this tool to validate configuration file validity.
// Configuration file validation // package.json, tsconfig.json, etc. // Copy to this tool for validation // Ensure configuration is correct
Code Examples
// JavaScript Example
const jsonString = '{"name":"John","age":25}';
const formatted = JSON.stringify(JSON.parse(jsonString), null, 2);
console.log(formatted);