JS2TS
AI-powered JavaScript to TypeScript code converter with instant type inference.
About JS2TS
JS2TS is an AI-powered converter that automates the transformation of JavaScript code into fully typed TypeScript. Users paste their JavaScript code and the tool instantly generates production-ready TypeScript with inferred types, typed interfaces, generic parameters, and proper type annotations. The converter handles common migration patterns including function types, object interfaces, array types, union and intersection types, class definitions, async/await return types, React components, and module exports. The tool targets developers migrating projects from JavaScript to TypeScript, reducing what would typically take hours of manual work to just seconds. It supports large files, ES6+ syntax, CommonJS, and ESModules, making it suitable for various project sizes and configurations. A key limitation is that for complex or ambiguous code patterns, the converter may fall back to TypeScript's `any` or `unknown` types, requiring manual refinement by developers.
At a glance
- Company
- 011BQ
- Platforms
- Web
- Last verified
- June 2026
Who It's For
- •Developers migrating JavaScript projects to TypeScript
- •Frontend developers working with React components
- •Node.js backend developers
- •Teams adopting TypeScript for better code maintainability
- •Developers seeking faster JavaScript-to-TypeScript migration
How It Works
- 1Users paste JavaScript code into the input box on the web interface
- 2AI analyzes the code and infers types from usage patterns, context, and naming conventions
- 3The system automatically generates type annotations, interfaces, and generics
- 4Converted TypeScript code with proper type declarations is displayed in the output box
- 5For ambiguous cases, the tool uses safe fallback types like `any` or `unknown`
How to Use JS2TS
- 1Navigate to js2ts.com in your web browser
- 2Paste or type your JavaScript code into the input box
- 3Click the 'Convert' button to initiate the conversion
- 4View the fully typed TypeScript output in the output box
- 5Copy the converted code for use in your project
Key Features
- •AI-powered automatic type inference
- •Function parameter and return type annotations
- •Object interface generation
- •Array and tuple type handling
- •Union and intersection type support
- •Generic type parameter inference
- •Class property type annotation
- •Async/Promise return type handling
- •React component prop typing
- •Module import/export type generation
- •Enum declaration conversion
- •Support for large files
- •No login or account required
- •Real-time conversion processing
Use Cases
- •Migrating JavaScript projects to TypeScript to catch type errors at compile time
- •Converting React components from .jsx to .tsx with properly typed props and state
- •Updating Node.js modules with typed exports and function signatures
- •Adding static types to legacy JavaScript codebases in team projects
- •Accelerating TypeScript adoption by automating the initial conversion process
Pros & Cons
Advantages
- •Completely free with no login, account, or credit card required
- •Handles large files and complex code patterns with support for ES6+, CommonJS, and ESModules
- •Instantly converts code that would take hours to do manually
- •Code is never stored or logged on servers, ensuring privacy
Disadvantages
- •For complex or ambiguous code patterns, falls back to `any` or `unknown` types requiring manual refinement
- •AI-powered conversion may not capture all nuanced type requirements for specialized use cases
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Frequently Asked Questions
What is JS2TS?
JS2TS is an AI-powered converter that automates the transformation of JavaScript code into fully typed TypeScript. Users paste their JavaScript code and the tool instantly generates production-ready TypeScript with inferred types, typed interfaces, generic parameters, and proper type annotations.
How much does JS2TS cost?
JS2TS is free to use.
Is JS2TS free?
Yes, JS2TS offers a free plan you can start with.
What are the best JS2TS alternatives?
Popular JS2TS alternatives include CodeConvert AI, AskCodi, Code Snippets AI.
What is JS2TS used for?
JS2TS is commonly used for Migrating JavaScript projects to TypeScript to catch type errors at compile time, Converting React components from .jsx to .tsx with properly typed props and state, Updating Node.js modules with typed exports and function signatures.
What platforms does JS2TS support?
JS2TS is available on Web.
Information Accuracy
Please note: While we regularly update all tool information including descriptions, features, pricing, and other details, this information may change over time as tools evolve and update their offerings. For the most current and accurate information, we recommend visiting the official website directly. Our goal is to provide you with comprehensive and up-to-date information to help you make informed decisions.