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So let's dive into this demo application

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and into networking with docker den,

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and for that, first of all

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I wanna briefly walk you through

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this node demo application which we have here.

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As I said that I'm using node as just well

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decision I made here.

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You don't have to use node,

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but this application here which is built with node

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has a couple of dependencies, axios, express, body-parser

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and mongoose

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and it uses all the dependencies and some custom code

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to in the end build a web API.

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Which basically means this is a web application

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which does not return HTML code or anything like that

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instead, it just returns data

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and it also just wants data

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when requests are sent to this API

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and this web API has four so-called endpoints.

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It accepts get requests to the API address

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or domain slash favorites.

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Post requests to the same URL

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also slash favorites at the end

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and then also get requests to this APIs IP

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or domain name slash movies and slash people.

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Now for movies and people

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we use these Star Wars dummy API I already talked about

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and we're going to send a naver HTTP request

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from inside this node API to that API.

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We don't know with which language it's build

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but that also doesn't matter to us.

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As I said, this Star Wars API

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is not owned by me, you or by us.

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It's a naver third party API.

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And we're sending a request there

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simply to then return the data fetch from this API

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in a response sent back from our own API

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to whoever requested this data.

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And that's what we're doing for movies and for people.

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But then we're all just establishing a connection

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to a MongoDB database

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and therefore you will need a running mongo database

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for this to work,

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I'll come back to that in a second.

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And with that database connection established

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in the other two endpoints,

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we store data here for the post requests to slash favorites.

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We store data in our database.

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In this case,

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we can basically bookmark our favorite movie or character

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so we can store some basic data

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about our favorite movie or character here.

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And we stored that data in the database

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by using a third party package named mongoose

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which makes this Node.js to MongoDB communication,

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a bit easier

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and for get favorites,

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I actually reach out to this database

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and I fetch some data from there.

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To be precise, I return all the favorites that were stored

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with help of this post favorites endpoint.

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That's what this application does.

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Now to see it in action

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I'll quickly do something which won't work on your system.

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I will start this application

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and it won't work on your system.

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At least not like this

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because you will need MongoDB to be installed for that.

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Now, if you absolutely want to run this application

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locally without docker first

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you can visit MongoDB.com docs server

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and then installation to learn how to install this

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locally on your system for Mac iOS, Windows and so on.

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But again, this is not required

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I will just give you a first look

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at what we're going to build throughout this module.

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You don't need to install MongoDB

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because we're going to dockerize this anyways.

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With that set though

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I got MongoDB installed up and running

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and now here in the terminal,

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I will run NPM install just like this,

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not inside of a container

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because I wanna show you this application

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without containers first.

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And with that

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I can then run node app.js to start this application

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it now connects to the database and so on.

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And to now test communicating to that API,

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I'm using postman,

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which you can download for free from postman.com.

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And that's simply a little tool

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which you can use to send HTTP requests to web APIs.

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With that installed I started postman here

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and we can now send a new HTTP request

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and I'll start with sending a get request

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to local host 3,000

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because this demo application is listening

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on port 3000

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and I'll send it to slash movies.

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And if I click send here after a while a short while

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I get back this movie's data,

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and again that is simply fetched

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from this Star Wars dummy API here.

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Now let's say I like this movie here, "A new hope."

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So what I'll do is I'll send the naver request,

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post request to local host 3000 slash favorites.

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This will target this endpoint here

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where the data then gets stored

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in my local MongoDB database.

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So with that, I need to add a body to this request

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and here I'll add a raw body in JSON format

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because this API wants data in JSON

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which is simply a text format for exchanging data

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and it's the most commonly used format for that.

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And here I then need to write curly braces

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and then provide free key value pairs.

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I need to add a name, a type,

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and a URL field to my request data.

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So here I add name between double quotes

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then type between double quotes

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and URL between double quotes

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and the URL can now be found

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from my response here on the first request to be sent.

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Here I'm going to grab this URL

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to this specific movie.

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The name was also returned there

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so I'm going to grab this name as well,

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"A new hope" like this

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add it between double quotes here

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and to type here is movie.

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And for my dummy application here

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it has to be movie or a character for any other type

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you would get an error.

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So here I'll set it to movie

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and if I now click send

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I get back this response that this favorite was saved.

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And if I now send another request

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to get local host 3000 slash favorites

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just like this,

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I now get all the favorites that were stored

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in my local database

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and with local database just to emphasize this again,

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I mean this MongoDB database

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to which I'm connecting down there in my node code,

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which is running on my host machine

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at the moment, everything is running on my host machine.

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I'm not running this node application

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in a container at the moment.

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So when I say local MongoDB database

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I really mean MongoDB which I installed

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on my machine before we started this module.

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You might not have it installed

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and therefore you can't run this code

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but we're going to put it into a container anyways.

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But I hope that for the moment,

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it's clear what this application does

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and what we can do with it.

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Now let's put it into a container

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and then see how we can still ensure

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that everything works as intended.