# Javascript

![](https://2641163225-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MLK7psSFFfaEwdrQS6L%2Fsync%2Fe5c4d36145becffc004914c319276f3805527a43.png?generation=1604525166469874\&alt=media)

WebAssembly is already available from Javascript for both the browser and the server (Node.js) 🤗

In this case, Wasmer provides a lot of useful packages to interact with WebAssembly modules in Javascript easily.

In this section we will see how to setup both your server-side and browser environments to use WebAssembly, and also how to use WebAssembly modules that interact with the Operating System such as [WASI](https://jubianchi.gitbook.io/wasmer-docs/fix-python-summary/integrations/js/wasi) using the different packages that Wasmer offer for Javascript.

## Published NPM Packages

Wasmer publishes various packages to NPM:

* [`@wasmer/wasi`](https://www.npmjs.com/package/@wasmer/wasi): The Package for using WASI easily from Node and the Browser
* [`@wasmer/wasm-transformer`](https://www.npmjs.com/package/@wasmer/wasm-transformer): it allows to run WebAssembly modules in browsers that doesn't have Wasm BigInt support 
* [`@wasmer/wasm-terminal`](https://www.npmjs.com/package/@wasmer/wasm-terminal): with WebAssembly files
* [`@wasmer/wasmfs`](https://www.npmjs.com/package/@wasmer/wasmfs): the filesystem for Wasm

Let's start!