TypeScript to JavaScript Converter Online Free — Convert TS to JS Instantly | DevToolBox

Convert TypeScript to JavaScript online free. Remove type annotations, interfaces, generics & enums instantly — no signup. Paste TS code, get clean JS in seconds.

TypeScript

JavaScript

About TypeScript to JavaScript Conversion

TypeScript is a typed superset of JavaScript that compiles to plain JS. Sometimes you need to quickly strip TypeScript-specific syntax to get clean JavaScript — for sharing code with non-TS projects, debugging, or learning what TypeScript compiles to. This tool removes type annotations, interfaces, type aliases, generic parameters, access modifiers (public, private, protected, readonly), type assertions (as Type), non-null assertions (!), and declare statements. It preserves all runtime JavaScript code including classes, functions, imports, and expressions. The output is clean, readable JavaScript ready to run in any environment. All processing happens in your browser with no external dependencies.

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How to Use

Paste your TypeScript code into the input panel
Click Convert to strip TypeScript syntax
Review the clean JavaScript output
Copy and use in your JavaScript project

Common Use Cases

Sharing TypeScript code with JavaScript-only projects
Learning what TypeScript compiles to
Quickly removing types for debugging or prototyping
Converting TypeScript snippets for documentation

Frequently Asked Questions

What TypeScript syntax is removed?

Type annotations (: string), interfaces, type aliases, generic parameters (<T>), access modifiers (public/private/protected/readonly), type assertions (as Type), non-null assertions (!), and declare statements.

Does it handle enums?

Basic enums are preserved as they have runtime JavaScript output. Const enums and ambient enums are removed as they don't exist at runtime.

Is the output production-ready?

The output removes TypeScript syntax to produce valid JavaScript. For production builds, we recommend using the official TypeScript compiler (tsc) or a bundler like esbuild for proper downleveling and module handling.

Does it downlevel modern JavaScript features?

No. This tool only strips TypeScript-specific syntax. Modern JS features (async/await, optional chaining, etc.) are preserved as-is. For downleveling, use the TypeScript compiler with a target setting.

How do I convert TS to JS online?

Paste your TypeScript code in the input panel and click Convert. The tool instantly removes all type annotations, interfaces, and TypeScript-specific syntax, giving you clean JavaScript output you can copy with one click.

Can I convert an entire TypeScript file to JavaScript?

Yes. Paste the full contents of your .ts or .tsx file into the input. The converter handles imports, exports, classes, functions, and all TypeScript syntax in a single pass.

Is this the same as running tsc?

This tool performs type erasure similar to tsc with --isolatedModules. For complex projects with path aliases, decorators, or project references, use the TypeScript compiler directly.