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Create Express Server
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00:00:02 To start creating our Express server, let's head into the app.js and let's make it work.
00:00:08 We can do it by importing Express from Express.
00:00:13 And then we are ready to initialize our app by saying const app is equal to Express.
00:00:18 And then we call it as a function.
00:00:20 As soon as you do that, you're already ready to create your first route.
00:00:24 You can do that by referring to the app instance and then calling the method of the HTTP call you want to make.
00:00:30 It can be app.post, app.put, or in this case, a simple app.get.
00:00:37 Then the first parameter you pass into it is the path of where this route will be reachable.
00:00:43 In this case, it'll be just forward slash, meaning on the homepage.
00:00:47 And as the second parameter, you can pass a callback function, which typically looks something like this.
00:00:52 An arrow function, where as arguments, you'll have access to the information about the request and the response.
00:00:59 And you can put them to use within this callback function.
00:01:01 What we typically do when we create a new API is just say rest.send hello world.
00:01:08 Or in this case, we can do something like welcome to the subscription tracker API.
00:01:17 Even though you've created your first route, that's not enough to be able to access it.
00:01:21 We have to make our server listen for requests trying to access specific routes.
00:01:26 And you can do that by calling the app.listen method and specify on which port you want to listen.
00:01:32 In this case, we can do something like port 3000. And then you can define a callback function, which will be executed once you run the application.
00:01:41 And there you can just do a console log, say something generic like server running on port 3000, or you can say subscription tracker API is running on
00:01:55 HTTP colon forward slash forward slash localhost colon 3000. This will expose the full URL of where you can access your routes.
00:02:04 And don't forget to run export default app.
00:02:07 With that in mind, let's give it a shot and run our application.
00:02:10 I'll do it by running npm run dev.
00:02:13 You can see that nodemon has started and subscription tracker API is running on localhost 3000. You can click this URL right here,
00:02:21 which will open it up in the browser.
00:02:23 And you can see welcome to the subscription tracker API, which means that our server is active.
00:02:28 Great.
00:02:29 That's a good start.
00:02:30 But in the next lesson, let's set up our environments so we can run this application both locally and in production.