Offline engine (processed locally)TYPESCRIPT v1.0.0 Spec

JS to TypeScript

v1.0.0

Migrate your JavaScript code to TypeScript automatically. This free converter infers types, adds interfaces, and converts `PropTypes` to TypeScript interfaces where possible. Perfect for bootstrapping type safety in existing JavaScript projects. Works offline in your browser, no registration required.

Live sync—ms

JAVASCRIPTInput (JAVASCRIPT)Invalid

lines: 1chars: 42Size: 42 BUTF-8

TYPESCRIPTOutput (TYPESCRIPT)

Auto-generated

Converted output will appear here

lines: 0chars: 0Size: 0 BUTF-8

Size change: -100.00%TOML compliant: v1.0.0

Tool guide

Accurate conversion

Input is processed by this tool’s dedicated converter.

Local processing

Your input is processed in your browser and is not uploaded.

Ready-to-use output

Copy the result or save it as a file.