Online class generator from JSON

Generate JavaScript/TypeScript class definitions from JSON data with properties, methods, and inheritance support.

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7,676+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Online class generator from JSON processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool transforms JSON data into fully functional JavaScript or TypeScript class definitions. Simply paste your JSON structure or upload a JSON file, specify a class name, and generate complete class code with proper constructors, getters/setters, and method stubs. Perfect for developers who need to quickly create class structures from API responses, database schemas, or configuration files. The generated code includes proper type annotations for TypeScript support and follows modern JavaScript best practices.

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How to Use

Paste your JSON data into the textarea or upload a JSON file using the drag-and-drop zone
Enter a name for your class in the 'Class Name' field
Click the 'Generate Class' button to create the class definition
Review the generated code in the results section
Copy the code to your clipboard or download it as a .js/.ts file

Frequently Asked Questions

Find Quick Answers

What JSON formats does this tool support?

The tool supports standard JSON objects with nested properties, arrays, and primitive values (strings, numbers, booleans, null). It can handle complex nested structures and generate appropriate class hierarchies.

Does the tool generate TypeScript or JavaScript code?

The generated code works for both JavaScript and TypeScript. It includes JSDoc type annotations that are compatible with TypeScript type checking while remaining valid JavaScript.

Can I generate multiple classes from a single JSON?

Currently, the tool generates a single main class from the provided JSON. Nested objects become property types but don't generate separate class definitions automatically.

What happens if my JSON is invalid?

The tool validates JSON syntax before processing. If invalid JSON is detected, you'll see a clear error message indicating the issue with line/column information when possible.

Are the generated classes production-ready?

The generated classes provide a solid foundation with proper constructors and method stubs, but you may need to add business logic, validation, or additional methods specific to your application requirements.

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