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All right, and once our aramid lawyer is able to handle our database errors.

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Now let's take a look at how we can check for both errors in the controller as well.

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And I'm talking about the registered controller, of course.

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First, it will make our API less error prone and second, in some cases checking for specific error

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in the controller before it hits the error middleware.

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It's actually quite useful, and it's my personal preference to use my error checking in the controller

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somewhat irregularly.

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Lastly, in the process, we'll also take a look at how we can set up custom or class.

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So.

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Let's get cracking by first navigating back to the off controller, and let's try to remember where

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the values are located, so they're located in the body, correct?

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So here's what I can do.

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I can just check for name in Maryland passport so I can pull them out.

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So name, email, comma and password and now set that one equal to a right down body.

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So we pull out the values and all we can do.

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We're going to check for empty values.

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I'm going to just say here your name is not provided or if email is not provided or if the password

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is not private.

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Correct.

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So if one of them is missing, what can we do?

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Well, remember, since we're using the package, the express async arrest package, instead of going

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next and passing in some kind of error when we need to do is go through new and for time being.

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We'll just rely on JavaScript error class.

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And again, if you're on a double check that just go back to the read me and let's click over here,

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let's navigate to their index.

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And once you get there as a refresher, remember, instead of going with next, we need to go through

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an error online.

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We pass in the error message.

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And this is coming from the JavaScript, and I'll probably mention that 20000 times in the following

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video.

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So we go with more and let's pass the message.

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Let's say please provide on values like show one.

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It also kind of makes sense that if we change the sound correct where instead of just passing it, everything

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that we're getting from that body, I'll specifically say that I want to pass a name, email and password.

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Mike, so let's save it.

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And before we can go any further, where we also need to do is go to the arrow handler.

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And now let's log specifically the message property.

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Because I want to showcase something, so instead of logging the entire object, I'm going to go with

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error and message.

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Now if you're wondering, how do I know that such message property exists?

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Oh, because we're using built in JavaScript error constructor.

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And if we take a look at the Indian ducks, we can say that it accepts a message as an argument.

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And just to demonstrate that I created a straight up vanilla jazz code where I create an object by invoking

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the Arrow Constructor and I passing the message.

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And once I logged erudite message, I get back the same value.

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Now, if you're wondering, which extension am I using to showcase the results straight up in my text

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that are the extension that is cue awkward.

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Yes?

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Now you don't have to buy a paid version.

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Essentially, there is a free version and a paid one.

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And as far as my use cases, I find the free version to be sufficient enough.

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So now let's head back to the postman and again, once remove the name, that probably is going to be

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the easiest.

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So let's send it here, and I'm getting back to five hundred and I still have something went wrong,

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so I do have the generic one.

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But let's take a look at the console and console over here says please provide all the values.

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Now, where is this coming from from here?

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Because this is the message that repression.

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So the first thing that we can do in order to set this up as 400 and then the actual message that we're

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passing in is in the era handler by setting up here the operator.

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So like I said in the beginning, it kind of looked useless, correct?

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Setting up this object, the default error.

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However, as we're adding more code, this looks very useful, correct?

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And now what I can do is say OK, if in the error that is being passed to this middleware, if there

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is already a message, then use that one.

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However.

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If there isn't one, then just go generic one.

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So the way that's going to look like we're going to go with air again, this is this error over here.

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Van, let's go with that message.

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And if it's present, then we'll go here.

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And if not, then we'll just go generic one.

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And remember, when it comes to the Mongols ones, we're overriding that anyway.

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So don't think about it too much.

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So let's go back over here.

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Let's Senate.

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And what?

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I still have five hundred fix that one in the following video, but not least, our message is custom.

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And what we're doing right now in the controller, we're actually checking for devices ourselves, which

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are going from time to time can be very useful.