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TypeScript to JavaScript Converter - TS to JS Online Free | DevToolBox

Convert TypeScript to JavaScript online free. TS to JS converter strips type annotations, interfaces, generics & enums instantly in your browser. No signup required.

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 โ€” 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

  1. Paste your TypeScript code into the input panel
  2. Click Convert to strip TypeScript syntax
  3. Review the clean JavaScript output
  4. 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.