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TypeScript 4.0 beta is now available. Get the latest version today!

Starts and ends with JavaScript

TypeScript starts from the same syntax and semantics that millions of JavaScript developers know today. Use existing JavaScript code, incorporate popular JavaScript libraries, and call TypeScript code from JavaScript.

TypeScript compiles to clean, simple JavaScript code which runs on any browser, in Node.js, or in any JavaScript engine that supports ECMAScript 3 (or newer).

Strong tools for large apps

Types enable JavaScript developers to use highly-productive development tools and practices like static checking and code refactoring when developing JavaScript applications.

Types are optional, and type inference allows a few type annotations to make a big difference to the static verification of your code. Types let you define interfaces between software components and gain insights into the behavior of existing JavaScript libraries.

State of the art JavaScript

TypeScript offers support for the latest and evolving JavaScript features, including those from ECMAScript 2015 and future proposals, like async functions and decorators, to help build robust components.

These features are available at development time for high-confidence app development, but are compiled into simple JavaScript that targets ECMAScript 3 (or newer) environments.

Get TypeScript


The command-line TypeScript compiler can be installed as a Node.js package.

npm install -g typescript
tsc helloworld.ts

See TypeScript in Action

Link to TypeScript video

Open Source

TypeScript is being developed on GitHub. The TypeScript compiler is implemented in TypeScript and can be used in any JavaScript host.

Get the source code
Help shape the future of TypeScript by joining our community today and send us pull requests via our GitHub repository!
Docs - To help you get started
GitHub & Stack Overflow - File and discuss issues
Blog & Twitter - Stay up to date