JS2TS for Web

Quick summary

JS2TS is a browser-based utility that converts JavaScript code into TypeScript. It leverages AI to automate much of the migration work, helping developers adopt TypeScript more quickly while preserving readability and structure.

How the converter functions

• Paste your JavaScript into the provided input area.
• Trigger the conversion with a single click.
• The AI engine analyzes the code and outputs TypeScript-compatible code for you to copy and use.

There’s also an option to enable an assistant-driven conversion mode that uses conversational AI to suggest typings and adjustments during the migration process.

Benefits of using JS2TS

• Speeds up project migrations by automating repetitive typing tasks.
• Introduces static types to improve code safety and catch issues earlier.
• Keeps the user experience simple and accessible for quick conversions.
• Produces TypeScript code quickly so you can iterate without delay.

Creator and goal

JS2TS was developed by Yuval Suede with the specific aim of smoothing the path from JavaScript to TypeScript. The project focuses on reducing manual effort and helping teams gain the advantages of static typing with as little friction as possible.

Alternatives to consider

• ts-migrate — an open-source migration toolkit for projects that prefer offline or scriptable workflows.
• ZeroStep (paid) — a commercial option recommended for teams seeking a full-featured, supported solution.

Quick start guide

1. Open the JS2TS web app in your browser.
2. Paste your JavaScript source into the input box.
3. Click the convert/run button to begin the transformation.
4. Review the generated TypeScript and copy it into your project, making manual tweaks as needed.

If you rely on complex runtime patterns, validate the converted output with tests and incremental commits to ensure behavior remains correct.