JS2TS is an AI-powered online tool that converts JavaScript code to TypeScript by adding static type annotations. It helps developers catch errors at compile time, improves IDE support with autocomplete, and enables safer refactoring. Users paste their JavaScript code, click Convert, and instantly receive typed TypeScript output. The converter handles common patterns: function signatures with parameter and return types, object interfaces, array types, union types, generics, type inference, class definitions, and module exports. It works with files of any size by incremental conversion. JS2TS is free, requires no sign-up, and processes all conversions in real time without storing or logging code.
Key Benefits
- AI-powered automatic conversion
- Instant results with one click
- Supports wide range of TypeScript patterns