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TypeScript to JavaScript

Strip TypeScript types from code

About TypeScript to JavaScript

TypeScript to JavaScript strips type annotations using regex pattern matching, not the real TypeScript compiler, entirely in your browser. It handles common cases — simple parameter and variable type annotations, interface declarations, type aliases, and generic angle brackets — but pattern matching can misfire on code that merely resembles a type annotation. Most notably, a ternary expression followed by a comma in the same statement can get corrupted, since the colon looks like a type annotation to the regex.

How to use TypeScript to JavaScript

  1. 1Paste your TypeScript code into the input box.
  2. 2Click 'Convert' to strip type annotations, interfaces, and type aliases.
  3. 3Review the output carefully, especially ternary expressions and generics.
  4. 4Click 'Copy' to copy the JavaScript result.

Frequently Asked Questions

Is TypeScript to JavaScript free to use?

Yes, it's completely free with no signup required.

Does it use the real TypeScript compiler?

No — it uses regex pattern matching to strip common type syntax, not the actual TypeScript compiler (tsc) or a TypeScript-aware transpiler like Babel.

Can it corrupt valid code?

In specific cases, yes — a ternary expression followed by a comma in the same statement can be misread as a type annotation and stripped incorrectly.

Is my code uploaded to a server?

No, conversion happens entirely in your browser.

Tips & Tricks

  • ✓Test the output by running it, especially for code with ternary expressions, generics, or unusual type syntax.
  • ✓For reliable TypeScript-to-JavaScript conversion, use the actual TypeScript compiler (tsc) or a build tool with TypeScript support instead.
  • ✓Simple parameter and variable type annotations convert reliably; complex or unusual type syntax is more likely to be mishandled.
  • ✓Keep your original TypeScript file, since this conversion isn't guaranteed to be correct for all code.