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<h1 id="nodejs-tutorial-in-vs-code">
Node.js Tutorial in VS Code
</h1>
<p>
<a href="https://nodejs.org/">Node.js</a> is a platform for
building fast and scalable server applications using
JavaScript. Node.js is the runtime and
<a href="https://www.npmjs.com/">NPM</a> is the Package
Manager for Node.js modules.
</p>
<p>
Visual Studio Code has support for the JavaScript and
TypeScript languages out-of-the-box as well as Node.js
debugging. However, to run a Node.js application, you will
need to install the Node.js runtime on your machine.
</p>
<blockquote>
<p>
<strong>Are you new to VS Code?</strong> Learn more and
download a
<a href="../../nodejs.html">faster Node.js editor here</a>.
</p>
</blockquote>
<p>
To get started in this walkthrough,
<a href="https://nodejs.org/en/download/"
>install Node.js for your platform</a
>. The Node Package Manager is included in the Node.js
distribution. You'll need to open a new terminal (command
prompt) for the <code>node</code> and <code>npm</code> command
line tools to be on your PATH.
</p>
<blockquote>
<p>
<strong>Linux</strong>: There are specific Node.js packages
available for the various flavors of Linux. See
<a href="https://nodejs.org/en/download/package-manager"
>Installing Node.js via package manager</a
>
to find the Node.js package and installation instructions
tailored to your version of Linux.
</p>
<p>
<strong>Tip:</strong> To test that you've got Node.js
correctly installed on your computer, open a new terminal
and type <code>node --help</code> and you should see the
usage documentation.
</p>
</blockquote>
<h2 id="hello-world">Hello World</h2>
<p>
Let's get started by creating the simplest Node.js
application, "Hello World".
</p>
<p>
Create an empty folder called "hello", navigate into and open
VS Code:
</p>
<pre><code class="bash">mkdir hello
cd hello
code .
</code></pre>
<blockquote>
<p>
<strong>Tip:</strong> You can open files or folders directly
from the command line. The period '.' refers to the current
folder, therefore VS Code will start and open the
<code>Hello</code> folder.
</p>
</blockquote>
<p>
From the File Explorer tool bar, press the New File button:
</p>
<p>
<img
alt="File Explorer New File"
src="../images/nodejs/toolbar-new-file.png"
/>
</p>
<p>and name the file <code>app.js</code>:</p>
<p>
<img
alt="File Explorer app.js"
src="../images/nodejs/app-js-file-created.png"
/>
</p>
<p>
By using the <code>.js</code> file extension, VS Code
interprets this file as JavaScript and will evaluate the
contents with the JavaScript language service.
</p>
<p>
Create a simple string variable in <code>app.js</code> and
send the contents of the string to the console:
</p>
<pre><code class="javascript">var msg = 'Hello World';
console.log(msg);
</code></pre>
<p>
Note that when you typed <code>console.</code>
<a
href="https://vscode.readthedocs.io/docs/editor/intellisense.md"
>IntelliSense</a
>
on the <code>console</code> object was automatically presented
to you. When editing JavaScript files, VS Code will
automatically provide you with IntelliSense for the DOM.
</p>
<p>
<img
alt="console IntelliSense"
src="../images/nodejs/consoleintellisense.png"
/>
</p>
<p>
Also notice that VS Code knows that <code>msg</code> is a
string based on the initialization to
<code>'Hello World'</code>. If you type
<code>msg.</code> you'll see IntelliSense showing all of the
string functions available on <code>msg</code>.
</p>
<p>
<img
alt="string IntelliSense"
src="../images/nodejs/stringintellisense.png"
/>
</p>
<p>
After experimenting with IntelliSense, revert any extra
changes from the source code example above and save the file
(<code>kb(workbench.action.files.save)</code>).
</p>
<h3 id="running-hello-world">Running Hello World</h3>
<p>
It's simple to run <code>app.js</code> with Node.js. From a
terminal, just type:
</p>
<pre><code class="bash">node app.js
</code></pre>
<p>
You should see "Hello World" output to the terminal and then
Node.js returns.
</p>
<h3 id="integrated-terminal">Integrated Terminal</h3>
<p>
VS Code has an
<a
href="https://vscode.readthedocs.io/docs/editor/integrated-terminal.md"
>integrated terminal</a
>
which you can use to run shell commands. You can run Node.js
directly from there and avoid switching out of VS Code while
running command line tools.
</p>
<p>
<strong>View</strong> >
<strong>Integrated Terminal</strong> (<code
>kb(workbench.action.terminal.toggleTerminal)</code
>
with the backtick character) will open the integrated terminal
and you can run <code>node app.js</code> there:
</p>
<p>
<img
alt="integrated terminal"
src="../images/nodejs/integrated-terminal.png"
/>
</p>
<p>
For this walkthrough, you can use either an external terminal
or the VS Code integrated terminal for running the command
line tools.
</p>
<h3 id="debugging-hello-world">Debugging Hello World</h3>
<p>
As mentioned in the introduction, VS Code ships with a
debugger for Node.js applications. Let's try debugging our
simple Hello World application.
</p>
<p>
To set a breakpoint in <code>app.js</code>, put the editor
cursor on the first line and press
<code>kb(editor.debug.action.toggleBreakpoint)</code> or click
in the editor left gutter next to the line numbers. A red
circle will appear in the gutter.
</p>
<p>
<img
alt="app.js breakpoint set"
src="../images/nodejs/app-js-breakpoint-set.png"
/>
</p>
<p>
To start debugging, select the Debug View in the Side Bar:
</p>
<p>
<img alt="Debug icon" src="../images/nodejs/debugicon.png" />
</p>
<p>
You can now click Debug tool bar green arrow or press
<code>kb(workbench.action.debug.start)</code> to launch and
debug "Hello World". Your breakpoint will be hit and you can
view and step through the simple application. Notice that VS
Code displays an orange Status Bar to indicate it is in Debug
mode and the DEBUG CONSOLE is displayed.
</p>
<p>
<img
alt="hello world debugging"
src="../images/nodejs/hello-world-debugging.png"
/>
</p>
<p>
Now that you've seen VS Code in action with "Hello World", the