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Cortex is your decision engine. Accelerate conversions and lower acquisition costs across $500M+ in managed marketing spend with real-time monitoring.
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What is JS2TS?
JS2TS is a free online AI-powered tool designed to convert JavaScript code into TypeScript by automatically adding static type annotations. Developed to simplify and accelerate the migration from JavaScript to TypeScript, it addresses the challenge of manually adding types to existing codebases, which can be time-consuming and error-prone. The tool supports a wide range of TypeScript patterns including function signatures, object interfaces, array types, union types, generics, and class definitions. It is ideal for developers, teams, and organizations looking to improve code safety, enable compile-time error detection, and enhance IDE support without extensive manual effort. JS2TS processes code instantly without storing user data, making it suitable for both small snippets and large codebases when converted incrementally. Its straightforward interface allows users to paste JavaScript code and receive typed TypeScript output with a single click.
AI Tool Review Summary
4.7/5
Accurate and reliable type annotations
Simple and user-friendly
LLMType Inference
To automate the conversion of JavaScript code into typed TypeScript code efficiently.
Web-based tool compatible with any platform via browser, fits into developer workflows requiring quick JS to TS migration.
Completely free with no sign-up required
Features with the highest value for users are highlighted here.
AI-powered JavaScript to TypeScript conversion
Support for function signatures and object interfaces
Handling of array types, union types, and generics
Conversion of class definitions and module exports
Real-time processing with no code storage
Free and no sign-up required
Supports large codebases with incremental conversion
Instant output display
Frontend Developers
Backend Developers
Software Teams
Open Source Contributors
Junior Developers
Tech Leads
Freelancers
QA Engineers
Educators
Full Stack Developers
Popular
Free
$0/free
Unlimited JavaScript to TypeScript conversions No sign-up required Instant output Supports large code snippets
Weekly intelligence on AI strategy, operations, and market shifts. No noise. No narrative. Direct to your inbox.
Pros & Cons
Fast and accurate automated type annotation. No account needed and code privacy ensured.
May require incremental conversion for very large files. Limited to JavaScript to TypeScript conversion only.
FAQs
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Rating
5.0
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| Tool | Rating | Visits / mo | Global rank | Category rank | Engagement | Bounce | Top market | Starts at | Free tier | Integrations | Action |
|---|---|---|---|---|---|---|---|---|---|---|---|
 JS2TSAI Development Tools | 9.4K | #2,341,278 | #21,185 | 52s1.8 pages | US(42%)#1,561,615 | $0 | 1 | View | |||
 deci.aiAI Development Tools | 636.1M | #48 | #4 | 6m 23s5.9 pages | US(19%)#75 | $0 | 1 | View | |||
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 PocketPal AIAI Development Tools | 1.2B | — | — | 2m2.6 pages | US(15%) | $0 | 1 | View |
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