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In this video.

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Let's go ahead and then improve this function a little bit by extracting the function to it on file.

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And then we're going to require it inside the server file.

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And that way we're going to have less code on the server JS file.

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And for this one tool, we can improve this one a little bit.

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So let's start with the how we can refactor this one and going to be pretty simple.

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Remember, this one is a middleware, so we are going to create a folder for that.

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So here we go in middle.

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Where and for me where we can have different types.

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For example, middleware for handling authentication or authorization, a middleware for handling errors.

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So I'm going to create one folder for arrows, and here we go.

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And I'll call this one as global error handler.

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Dart JS and inside is a fire.

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We are waiting to catch the call back here.

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So inside the to use, we are going to cut everything inside that.

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So when I cut it, you can see that everything has been removed.

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And now back to this file.

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I'm going to paste that one and I'm going to name it as const.

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Global.

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Error handler.

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The name is apt you when I save it.

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The next step is I need to export from this file module.

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Dot exports is equal to global error handler.

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Middle world.

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So that is it.

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So inside the server file I will go ahead and then require that.

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So here we go to next step is our pass as a callback function to this.

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As that.

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So save it.

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And now let's try again to initiate some error if we're going to happen.

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So for this one, let's send some wrong ID and let's send and indeed everything is working fine.

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The next step is about the photo for error handler.

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So back to the server file for this one to we can reduce the number of code here because we have the

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function called the app error, where we can create instance of error with a customized message.

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We can do the same thing inside the photo for error handler here.

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So this how are we going to do?

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We are going to create a variable and assign the entire message into that.

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So let's comment this one and let's begin with the implementation.

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So here we go.

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Cast error is equal to then I'll bring in the app error class.

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And then for this one, I'm going to pass in the message, which is this.

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So our policy as first agreement to this and lastly, I'll pass in the status code for oh four.

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So now I can remove this one and last that is, I need to pass this message to the next.

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So here we go.

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You're going to be us next.

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Now pass in the arrow and that is it.

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So let's go ahead and make a request to Iraq, which has been defined.

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So, for example, for a slash log E or for a slash account, if I hit send, you can see that I got

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this message for a slight account not found.

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Now everything is working fine.