JavaScript to TypeScript Converter

Convert JavaScript code to TypeScript instantly with our online tool. Perfect for developers adding type safety to their code.

JavaScript Code
TypeScript Code

Type Inference

Code Style

Advanced

Key Features

Smart Type Inference

Automatically adds TypeScript types to your JavaScript code based on usage patterns.

Modern JavaScript Support

Handles ES6+ features like classes, arrow functions, and modules while converting to TypeScript.

Code Quality Improvements

Enhances your code with interfaces, enums, and access modifiers for better maintainability.

How to Convert JavaScript to TypeScript

  1. Paste your JavaScript code in the left panel or upload a .js file
  2. Click "Convert to TypeScript" to transform your code
  3. Copy or download the resulting TypeScript code from the right panel
  4. Use the options panel to customize the conversion style

Supported JavaScript Features

  • ES6 classes and modules
  • Arrow functions and async/await
  • CommonJS require() and module.exports
  • Object literals and prototypes
  • Dynamic typing patterns