JS2TS

Convert JavaScript code into fully typed TypeScript directly in your web browser

Pricing model

Free

Rating

★ People love it

Time to value

Immediate

You can use JS2TS to convert plain JavaScript code into typed TypeScript in seconds. Simply paste your existing JavaScript or JSX into the browser window, run the conversion, and receive TypeScript with type annotations, interfaces, union types, and generic definitions. It handles React components, Node.js modules, async functions, and class definitions automatically without requiring any account or login. Your code remains private because conversions execute in real time without being stored. The site also provides instant converters for JSON schemas, Zod definitions, and Tailwind CSS.

What JS2TS does

Convert JavaScript code blocks into TypeScript syntaxGenerate TypeScript types and interfaces from JSON dataAdd parameter and return type annotations to functionsTransform React JSX components to TSX with prop interfacesCreate Zod schemas from existing JSON modelsConvert standard CSS definitions into Tailwind classesAutomatic type inference from existing JavaScript codeGeneration of TypeScript interfaces and generic typesConversion of React JSX files into typed TSX componentsSupport for async functions and Promise return typesBrowser-based conversion requiring no account or installationPrivate real-time processing that does not store code on serversAdditional converters for JSON, Zod schemas, YAML, and Tailwind CSS