TypeScript to JavaScript Converter

Strip TypeScript-specific syntax to produce clean JavaScript. Removes type annotations, interfaces, type aliases, enums, generics, access modifiers, and type assertions. Converts enums to Object.freeze objects. Runs entirely in your browser -- fast, free, and private.

TypeScript Input Paste your .ts code
JavaScript Output Clean JS result

Features

✏

Type Annotations

Strips all type annotations from variables, parameters, and return types. Handles primitive types, union types, array types, and complex generic types.

🗂

Interfaces & Types

Removes entire interface and type alias declarations including multi-line blocks with nested properties and generic constraints.

🔄

Enum Conversion

Converts TypeScript enums into JavaScript Object.freeze() objects, preserving the enum values and providing runtime immutability.

🔒

Access Modifiers

Removes public, private, protected, and readonly keywords from class properties and methods, producing valid JavaScript class syntax.

📄

Generics & Assertions

Strips generic type parameters, "as Type" assertions, and non-null assertions (!) to produce clean JavaScript without any TypeScript remnants.

🔒

Private & Secure

Everything runs in your browser using JavaScript. No data is sent to any server. Your code stays completely private on your machine.

About TypeScript to JavaScript Conversion

TypeScript is a superset of JavaScript that adds optional static typing, interfaces, enums, generics, and other type-system features. While TypeScript must be compiled to JavaScript before running in browsers or Node.js, sometimes you need a quick way to strip the types without setting up a full build pipeline.

When to Use This Tool

This converter is ideal for quick one-off conversions, learning how TypeScript maps to JavaScript, sharing code snippets with developers who don't use TypeScript, debugging type-related issues, or extracting the runtime logic from TypeScript code. For production builds, use the official TypeScript compiler (tsc) or bundlers like esbuild, swc, or Babel with the TypeScript plugin.

What Gets Removed

Frequently Asked Questions

How does the TypeScript to JavaScript converter work? ▼
The converter uses regex-based pattern matching to identify and remove TypeScript-specific syntax. It strips type annotations, interface/type declarations, enum conversions, generic parameters, access modifiers, type assertions, and non-null assertions. Everything runs client-side in JavaScript with no server calls.
What TypeScript features are stripped? ▼
The converter removes type annotations (: string, : number, etc.), interface declarations, type aliases, generic type parameters (<T>), "as Type" assertions, enum declarations (converted to Object.freeze objects), access modifiers (public, private, protected, readonly), and non-null assertions (!).
Does this tool handle all TypeScript syntax? ▼
This tool handles the most common TypeScript patterns including type annotations, interfaces, type aliases, enums, generics, access modifiers, and assertions. For complex TypeScript features like conditional types, mapped types, or decorators, the official TypeScript compiler (tsc) is recommended.
Is my code sent to a server? ▼
No. All conversion happens entirely in your browser using JavaScript. Your code never leaves your device. This makes the tool safe for converting proprietary or sensitive TypeScript code.
How are enums converted? ▼
TypeScript enum declarations are converted to JavaScript Object.freeze() objects, which provides the closest equivalent behavior. For example, enum Status { Active = "ACTIVE" } becomes const Status = Object.freeze({ Active: "ACTIVE" });. This preserves the enum values while adding immutability.

Explore More Developer Tools

Check out our other free developer tools for code formatting, conversion, and analysis -- all from your browser with no sign-up required.

JSON Formatter → JS Minifier →