# Introduction

# Using existing libraries

Quark comes pre-installed with a few libraries. You can check which libraries are pre-installed by going to Help > View Installed Libraries from the main menu.

This will open a dialog listing all the pre-installed libraries.

Some of these libraries are used internally by the software, some of these libraries are proxied and exposed as an API, and some are used by the build system. Nonetheless all of them can be used from your project. Find out specific tutorials of using some of those libraries here.

# Installing new libraries

Once you are comfortable with the Quark software and using the built-in functions/features, you may want to extend the ability of your project with additional libraries.

# Using the built-in npm client

To install a new library in your project you can use the built-in npm client. Click on the npm logo in the sideview to open the client, and search for the library you want to use.

You can install the library by pressing on the install button, or first view the library repository by pressing on the Repository button.

After hitting the install button, you will be presented with an install status snackbar. If installing the library fails, you can check the logs from the Devtools section in the output-channel.

# Using systems package manager

If you happen to have a package manager installed on your machine (e.g. npm or yarn) you can use that too.

# e.g. npm
npm install express

# e.g. yarn
yarn add express