TypeScript to JavaScript Converter
Strip TypeScript types — annotations, interfaces, generics, enums — into runnable JavaScript.
Strips type annotations, interfaces, type aliases, generics, as/satisfies assertions, access modifiers, type-only imports, and converts enums to const objects. Strings, comments and regexes are preserved. It is a fast eraser, not a full compiler — review the output for unusual type expressions.
Examples
Stripping types from a small module
interface User {
id: number;
name: string;
}
function greet<T extends User>(user: T): string {
return `Hello ${user.name}`;
}
const alice: User = { id: 1, name: "Alice" };function greet(user) {
return `Hello ${user.name}`;
}
const alice = { id: 1, name: "Alice" };The interface is erased, the generic parameter and return type are dropped, and the side-effect-free const stays — with the template literal preserved.
About this tool
The TypeScript to JavaScript Converter erases the type-level parts of TypeScript and hands back the runnable JavaScript underneath. It removes type annotations on variables and parameters, return types, generic type parameters, interface and type-alias declarations, type-only imports, access modifiers, and as/satisfies assertions, and it rewrites enums as plain const objects.
Strings, template literals, comments, and regexes are masked first, so the tool never rewrites code that lives inside them — your comments survive into the ported file. Everything runs in your browser and nothing is uploaded. It is a fast type eraser rather than a full compiler: it handles the constructs that make up ordinary typed code, and for unusual expressions it is best to glance over the result before shipping.
How to use
Paste your TypeScript
Paste in typed code — annotations, interfaces, generics, and enums are erased; strings and comments are left untouched.
Inspect the emitted JavaScript
Review the output: interfaces and type aliases are gone, enums became const objects, and generics/access modifiers were stripped.
Review before shipping
Because it is a type eraser rather than a compiler, double-check unusual constructs and runtime-only TS features by hand.
Use cases
Strip types for a snippet
Share or demo a typed snippet as plain JavaScript without shipping your type definitions.
Port into a JavaScript codebase
Turn a typed module into plain JS when converting a file into a codebase that has not adopted TypeScript.
See what the code does at runtime
Remove the type layer to reason about the actual runtime behavior of a file distracted by annotations.
Common mistakes
Mistake:Expecting exact TypeScript enum semantics.
Fix:Enums are rewritten as plain const objects — numeric reverse-mapping and const-enum inlining behave differently, so verify the port.
Mistake:Trusting advanced runtime transforms.
Fix:Parameter properties, decorators, or metadata emit are beyond a type eraser — review those constructs by hand before shipping.
Mistake:Worrying the tool rewrites your strings.
Fix:Strings, template literals, comments, and regexes are masked first, so text that resembles a type annotation is never modified.
Frequently asked questions
Related guides
TypeScript to JavaScript: What Type Erasure Actually Removes
Exactly what a TS-to-JS converter strips — annotations, interfaces, generics, enums — what it preserves, and why a type eraser is not a compiler.
Python to JavaScript: Porting Code Without the Rewrite
Map Python's print, def, if/for/while, f-strings, and lists onto JavaScript equivalents, and know which constructs to finish by hand.
References & standards
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