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In this video.

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Let's go ahead and improve the way we are handling this kind of error.

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That is the validation error.

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Remember, the global error handler handles any error that might occur in our application.

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But let's say that we want to handle a specific error type, for example, validation error, and we

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want to send some customized message based on this kind of error.

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In that case, we can create a function to do that, or we can maintain this way because this one is

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more clear than the before.

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But let me show you how we can create a specific error message for specific error type.

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So here we go inside the utils folder.

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Let's create one file core handle.

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Validation error in MongoDB DB for short as that.

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So here is a function const handle validation error DB is equal to error function.

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For this function we are going to pass in the entire error object as we see in the catch here.

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So for that object we are going to extract some properties and add our custom message to it.

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So our pass in the error here.

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And before we continue, let's go ahead and continue that log, the error that we passing here upon

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calling the function.

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So let's export the function here as that.

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So now inside this file, let's go ahead and require the function.

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So inside this route that is on the catch, let's remove this one for now or we can comment that one

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and we call the function here and then we pass in the entire error.

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So let's check our terminal after we make the request.

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So here we go.

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Our head send.

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And you can see that this is an error object.

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And what we want is that we want to extract the properties and value and customize it.

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So inside a function, let's see how we can get that one done.

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We are going to create an object called arrows, and it's equal to we're going to use object values

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to get the values from the properties of the arrow.

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So make use of objects, dot values.

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So here we pass in the entire arrow objects, and on that we have a property called arrows.

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Next step is let's go ahead and look through, use it map.

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And for this one, I have access to the individual element.

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And on that we have what is called message.

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So the next step is that I'm going to create a variable core message.

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And on that, I'm going to add my custom message by saying that invalid.

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Imputes.

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Data.

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And then I would inject the actual message and I'm going to use dollar sign to replaces the entire error

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objects.

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Then I'm going to join with dot as that.

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Next step is let's return the message from this function.

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The next step is that inside the server file, let's go ahead and then require that call handler validation

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error.

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We have it already.

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So now here is the handler.

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So if I go ahead and send the request now, let's see, you can see that it is loading because we are

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not retaining or passing to the next function.

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So what we need to do is that we are going to convert or pass this message to the global error handler.

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So we are going to bring in the app error class here.

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App error.

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And before sending, I want to customize it.

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So here I'll make use of new and then create instance of the app error.

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And next I'll pass in the message, the one that I've customized, which is this one and next is I'll

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pass in the status quo score 400.

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So for this one, we are sending our customized message to the global arrow handler as that.

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So what we are going to do is that we are going to send this message to the next handler.

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So here we go.

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Let's remove everything from here and I'll bring it next.

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And for that I'll pass in the function as that.

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So when I say it now, let's go ahead and make the request.

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And this time around you can see that we have our custom message code invalid.

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I think I made some type of mistake here, so here is going to be as invalid.

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As that.

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So let's see, when I hit ST and you can see that we have a customized message that is invalid input

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data.

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So if we want to maintain by using the global method of 100 arrows, we can do that.

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Or if we want to stick to a custom message for a specific arrow type, then this is a way to go.

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So the next video.

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Let's see how we can handle Arrow for example, invalid object ID.

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Let's get into that.

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The next video.