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In the previous course section,

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we get started with NodeJS.

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Now, at this point, we don't fully use

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the advantages NodeJS offers to us.

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For example, we're not talking to a database,

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but we get the solid foundation

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that we need to write code that executes

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on the server instead of in the browser.

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However, with just NodeJS,

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which is what we are using here,

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we have certain limitations;

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or to be precise, as a developer,

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we have extra unnecessary work to do.

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Now, for example, for every website that we build,

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we have to create that Node server on our own

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and define this request handling function.

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And whilst that may be doesn't sound too bad,

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what about the code inside this function?

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Here we then have to check the request.url

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and handle different cases to execute different code.

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That's all possible, but it's all pretty low level

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as it's called.

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We have to parse and look up the URL manually;

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we have to write this "if" statement manually.

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And if you are building a complex website,

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let's say an online shop with many different pages

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where you at some point then maybe also need

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to parse incoming user data,

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then there will be a point where this gets very cumbersome.

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And that's why we typically don't work

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with just NodeJS like this,

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but why we use a third-party library on top of NodeJS

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to make our life as a developer a bit easier

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just as we used third-party libraries before in the browser

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to help ourselves with some predefined styles

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or to easily add something like a parallax effect.

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For the same reason, we also might want to simplify

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our life when it comes to the backend code.

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And that's why in this section,

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we will start adding a third-party package.

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To be precise,

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this course module is about NodeJS Development

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with a third-party library called ExpressJS.

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And then this course section,

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you will not just learn why we use that,

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we already had a look at the "why" right now in this video,

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but you will also learn what exactly ExpressJS is

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and how you use it.

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And we are going to explore how we can handle

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the requests and send back responses with ExpressJS,

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and you will see that it will be a bit easier

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than with just NodeJS.

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And therefore, since we will now have this simplification

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and this extra help from this library,

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in this course section,

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we are now also finally going to start parsing

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some user input submitted through a form,

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and we will then also store that input in a file

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that will be stored on the server,

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which we then in turn can use

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to generate dynamic HTML pages based on that file content.

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But we'll get there step by step;

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let's, first of all, start by installing ExpressJS,

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and let's see how it works.