JS2TS

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Free AI web tool that converts JavaScript into typed TypeScript instantly, adding interfaces and annotations with no login.

What it does

JS2TS is a free, browser-based tool that uses AI to convert JavaScript code into TypeScript. It adds type annotations, interfaces and generics automatically, turning a manual migration that could take hours into a one-click process. No account is required, and the site hosts many related code and data conversion utilities.

How to use: To use JS2TS, paste your JavaScript code into the input box and click the 'Convert' button. The tool will then display the converted TypeScript code in the output box.

Core features

✦AI JavaScript-to-TypeScript conversion
✦Adds interfaces, generics and annotations
✦Instant, no-login use
✦Sample code and try-it examples
✦Many related converters (JSON, YAML, CSS, etc.)
✦Developer guides and cheatsheets

Use cases

→Migrating JS files to TypeScript
→Adding types to legacy code
→Learning TypeScript syntax
→Quick one-off code conversions