JS2TS

Overview

JS2TS converts JavaScript to TypeScript with a single button click, adding type annotations while preserving functionality. It offers quick examples and supports JSON‑to‑TypeScript, CSS‑to‑JSON, and CSS‑to‑Tailwind conversions for developers, teams, and code maintainers.

From the official site

Convert JavaScript to TypeScript with AI in seconds. Free online converter with types, interfaces, and generics.

The text above is quoted from this tool’s official website — the vendor’s own words.

Key points from the official site

Initiate the conversion process by clicking on the "Convert" button
Module import/export types
JavaScript to TypeScript Converter

The points above are quoted from this tool’s own website sections and feature lists — vendor copy, not our review.

Official FAQ

What is a JavaScript to TypeScript converter?: A JavaScript to TypeScript converter is a tool that automatically adds static type annotations to existing JavaScript code. It converts JS files to TS by inferring types from usage patterns and adding explicit type declarations, interfaces, and generics — turning plain .js files into fully typed .ts files.
How do I convert JavaScript to TypeScript?: To convert JavaScript to TypeScript: (1) Paste your JS code into the JS2TS converter. (2) Click Convert. (3) The AI adds type annotations, interfaces, and generics automatically. (4) Copy the TypeScript output. For manual conversion, rename .js to .ts and add type annotations by hand — but AI converters do this instantly.
Is this JS to TS converter free?: Yes, JS2TS is completely free. No account, login, or credit card required. Paste JavaScript code, click Convert, and copy the typed TypeScript output instantly — unlimited conversions.
What TypeScript patterns does the converter support?: The AI-powered JS to TS converter handles: function parameter and return types, object interfaces, array types, union and intersection types, generics, type inference, class definitions with typed properties, async/await return types, and module exports. It covers the most common JavaScript-to-TypeScript migration patterns.
Can I convert large JavaScript files?: Yes. JS2TS handles large files. For very large codebases, paste sections incrementally for best results. The converter processes any valid JavaScript including ES6+ syntax, CommonJS, and ESModules.
Does JS2TS store my code?: No. Conversions are processed in real time and your code is never stored or logged on our servers. Your JavaScript code stays private.

These questions and answers come from the tool’s own structured data, not written by us.

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