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All right.

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And before we set up the controllers and our first router, I also want to add two more Middlewares,

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one for NotFound requests.

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And the second one is going to be the error middleware and then in the next video.

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I'll discuss the differences because this is a very common question in the course Q&A.

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So first of all, let's navigate to a server.

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And after all our requests.

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So again, right here where I have the port, I want to go with app dot use.

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And if we provide a star over here, essentially this is going to apply to all of the requests.

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So notice we're not using any kind of method.

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So in here I say app dot use, which means any method.

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And as far as the URL is going to be all the URLs because we have the star and then we need to provide

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here.

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Rack and raise.

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So that's our response.

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And essentially, I just want to go with resort status and 404.

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So pretty much every time the user is going to try to access some kind of resource that we don't have

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on our server, we're going to send back 404 and then Dot and Json and we're going to go over here with

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message not found.

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Now before we test out our middleware.

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I know it's a little bit confusing probably, but let me comment this one out and let me just showcase

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that.

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Express already sends back the error message.

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So let me go to all routes.

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Again, it doesn't really matter which request you're making.

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In my case, I'm going to go with get request.

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That's going to be the easiest one and just change something about this URL.

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Add an extra s and you'll notice this response.

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404 not found.

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So this is what the Express is sending back.

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And effectively in our case, we want to change that.

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We want to set up our own.

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Not found middleware again.

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It needs to be right after all of the routes.

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So basically, if none of these routes match because the way the Express reads, the routes, the order

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matters, and then if none of those routes match, then we simply provide this response.

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So I'm going to go back over here to get all jobs.

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Let's send it here.

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And now notice I'll have the same status code 404, but the response is going to be in the Json format,

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and I'm going to send back the message not found and also in Express.

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We can set up a error middleware, which is very useful when we want to handle errors.

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And like I mentioned before, when we worked on the front end.

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Handling errors is going to be big part of the application.

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Now, one rule this middleware has to be the last one.

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And yes, in the following video, I'll discuss the differences between the 404 and the error middleware,

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but make sure it's the last one.

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And as far as the controller, it's going to have access to four parameters.

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So how is that going to look like?

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We'll go with App.use.

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We're not going to provide any kind of URL.

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And in here, like I said, in the controller, there are four parameters and the first one is the error.

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So that's where we'll see the actual error.

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Then req res and also a next one.

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And as far as the next we'll talk about a little bit later.

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I mean, again, my expectation is that you are already familiar with these things.

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But if anything, we'll talk about this next one a little bit later when we have a different middleware.

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So now let's go with Log.

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We'll definitely log the error.

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That's something very useful as far as the response will go with dot status.

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And for now, let's just go with something generic Again, these things will change, but for now we'll

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go with the rest Dot status 500, which just means that there was a generic server error.

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And then as far as the message, we'll go with something went wrong.

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And then in the following video, like I said, I'll talk about the differences between these two,

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the 404 and error, and also we'll test out our error middleware.