TypeScript to JavaScript Converter
Convert TypeScript code to JavaScript instantly in your browser — private, fast, no server required.
TypeScript Input
JavaScript Output
What is TypeScript to JavaScript Conversion?
TypeScript is a strongly-typed superset of JavaScript that compiles down to plain JavaScript. TypeScript to JavaScript conversion — also called transpilation — strips out all type annotations, interfaces, enums, and TypeScript-specific syntax, producing clean JavaScript that runs in any browser or Node.js environment. This tool uses the official TypeScript compiler API (ts.transpileModule()) entirely in your browser — no server involved.
Why Convert TypeScript to JavaScript?
- Run TypeScript code in environments that don't support it natively (plain browsers, legacy Node.js)
- Debug transpiler output and see exactly what the TS compiler produces
- Understand how TypeScript syntax maps to JavaScript equivalents
- Quickly prototype and share runnable JS snippets from existing TS code
- Audit build output for specific ES targets before deployment
ES Target Versions
| Target | Year | Key Features |
|---|---|---|
| ES5 | 2009 | Broadest compatibility, no arrow functions or classes (polyfilled) |
| ES2015 | 2015 | Arrow functions, classes, let/const, template literals, modules |
| ES2017 | 2017 | async/await, Object.entries/values |
| ES2020 | 2020 | Optional chaining (?.), nullish coalescing (??), BigInt |
| ESNext | Latest | Latest JS features, minimal transformation applied |
FAQ
Does this tool do type checking?
No. This tool uses ts.transpileModule(), which performs single-file transpilation without running the TypeScript type checker. Type errors are silently ignored — the focus is pure syntax transformation. For full type checking, use tsc on the command line.
Can it handle decorators?
Basic TypeScript decorators are supported via the TypeScript compiler's transpiler. However, complex decorator metadata (e.g. for Angular/NestJS DI) may require emitDecoratorMetadata: true, which is not enabled here. For production decorator usage, configure your own tsconfig.json.
Is my code sent to a server?
No. All conversion happens entirely in your browser using the TypeScript compiler loaded as a client-side library. Your code never leaves your machine — this tool is fully private.
What is the difference between CommonJS and ESModule?
CommonJS uses require() and module.exports — the traditional Node.js module system. ESModule uses import/export — the modern standard supported by browsers and newer Node.js versions. Choose ESModule for modern projects and CommonJS for legacy Node.js compatibility.