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Beautiful, before we worry about deployment, let's make our Mangoush, our responses more user friendly,

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and before we start, let me just say that just like our air classes, we will only do this once.

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And after that, we'll bring it from project to project.

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So if at some point you get bored, just remember, we only need to do that in this project.

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And then for a mining project, of course, we'll just reuse the code.

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And the idea is following where currently we have three Mangoush errors.

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We have validation.

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One member of that is if the user doesn't provide one of the values, then we have the duplicate issue

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where email is unique.

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And of course, we also have the Kastor.

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And if you remember, that's when the syntax doesn't match exactly to what the Mangoush is looking for.

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We want to go to the middleware and more specifically, we want to go to the area handler.

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And of course, at the moment I'm logging the error and in here I'm just sending back this generic response.

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So internal server error and I'm just passing in the object.

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And if I take a look at the postman, I'm going to be looking for a register out.

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And then if I have already a user in this example, Susan, so if I already have that email and if I

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try to register one more time, of course, I'm going to get that duplicate error correct, because

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I already have the email in the system.

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And essentially the goal is following where we want to send back more user friendly response.

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And also we want to change the status code because at the moment we're just sending five hundred.

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But of course, this is for her.

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This is a bad request.

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And the way we do that, we navigate back to our handler Mador, and we'll start by creating a object,

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a custom or object.

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And the reason we will do that, because we'll set up multiple if statements.

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Now, technically, you can also manipulate this code and I'll show you in a second why and how.

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But in my case, I'll just leave it the way it is.

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So if our error is our custom one, basically, if it's one of the classes, then we'll just write a

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Western backed response.

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If not, there's going to be a new customer object and then as far as the response will send back that

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object instead.

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So let's start working on that.

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And essentially, we want to go with some kind of variable.

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I guess I'm going to go with let just so I know that I'm going to be manipulating those values and I'll

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set custom error and that one is equal to status code and the message.

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So here I want to set up two properties and basically you want to set defaults.

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So the same idea.

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If there is already something provided, then of course we'll send back that.

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If not, then there's going to be some kind of default.

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And effectively it's going to look something like this where we'll go with the property name.

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So status code and this will be equal to error and then the status code.

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And eventually there's going to be multiple if statements that will manipulate this value.

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So in here, I'm just setting up the default.

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I say, hey, listen, if in the error I already have the status quo, then use that.

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If not, well, then let's set up the generic response, let's say status codes, and we're looking

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for internal server error.

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And that, of course, is going to be five hundred.

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And let's do the same thing with the message, the message, property and error.

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And let's just say your message and let's go to vertical bars and we'll say something.

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Something went wrong and let's say try again, again later.

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And now, of course, what we want to do is change this code around where instead of sending this internal

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server error and Jason, an error, of course, we'll use these values instead.

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Now, I will still leave this code, meaning I'll just comment this out.

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So copy and paste and coming down just because I'll be sending those error object back to the postman,

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because I find it easier than logging in here and chasing it around the terminal, then that is just

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my preference.

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And essentially what we want to change over here is the error.

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Now, of course, we're looking for custom error and then we want to go with status code.

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And then as far as the JSON, while the same thing, we're going to go with a message and we'll set

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it equal to our custom.

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Our that and of course, we're looking for the message.

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And you'll notice that at the moment there's really no difference.

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So if I go back and again, try to register, Susan, even though the email is already in use, I see

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this one.

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I see or hear a message.

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And this is going to be that Mongo's one.

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And of course, I still have this five hundred.

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So technically, nothing changed.

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Now, of course, this is where we'll work on right now, we're after our custom API instance will go

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here.

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If and essentially if you want to check, we will have to take a look at the object one more time.

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So this is why I'll keep both of these responses, because it is hard to find that area over here.

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And essentially, I'll be sending back the object just so you can see what is happening.

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And I think for the time being, I'll get the.

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So let me just say right here, let's send one more time and what you'll notice that, of course, if

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we have that duplicate issue, this is the error that we're getting back.

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And effectively what we want to do, we want to check if the error code exists and the code is equal

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to this eleven and then three zeros, then we want to send back this value, this Imman one.

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So then we want to access this key value and then just come up with some kind of message.

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So it's going to look something like this where we're going to go with F.

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Then, like I said, we're checking for error code and keep in mind that I'm not talking about custom

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error here, I'm saying, yeah, there is a error object and I want to check whether it has the code

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properly.

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And if it has done, I want to check more specifically if the value is equal to 11 and three zeros.

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So go here like this and that.

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If that is the case, then I know that I can access, of course, this key value property and I just

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need to come up with some kind of message.

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Now, what we'll do over here, like I said, will modify these values over here.

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So in here, we just set up the defaults.

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If the error is not going to match any of our conditions, that either will use the actual error status

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code if it exists as well as the message.

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If not, then of course, we'll have these defaults.

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Hopefully that is clear.

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And let's just start by setting up the message now how we can do that.

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Well, we can go with custom error.

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So that's our object.

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And essentially we're overriding the message.

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Correct?

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I'm just saying the message value will be equal.

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And in this case, I'm going to use the template Michal's because I'll pass in the actual error value.

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And as far as text, I'm just going to say duplicate value entered for now.

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Texas, the value would say error.

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And again, remember, we're looking for this property over here, correct.

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So say here error and we're looking for key value.

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And then we just want to continue with the text field.

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Please choose another value.

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Another value, and of course, I also want to change the status code, so in this case I'll go with

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custom error and I'm looking for status could probably and I'll set it equal to 400 because this is

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a bad request.

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And since we can clearly see the error object, since we already have all of the code that we need,

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again, I'm just going to hop around here and I'll come on this one out because I will use this one

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in a later videos and then we'll go back to this custom one.

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And once we set everything up now, of course, we can navigate here.

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We can send and of course, this is the response.

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So now we have the message.

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We have duplicate value entered for object object and work on this one a little bit later.

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And what's really cool that of course, now we have 400.

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So we can clearly see that it is a better question.

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Now, if we don't want to send this object object, which of course is not that helpful, we'll simply

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need to use a little bit of JavaScript where, of course, we have the object.

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So our key value is an object.

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And JavaScript we have object dot.

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And of course, in our case we're looking for keys.

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So this will give us a array of keys and of course in this case will only have the email.

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So it's going to look something like this, whatever object is, and then we'll pass in our error and

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key value and as a result will get back array of the keys.

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So let's send one more time.

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Let's go back over here.

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And now, of course, we'll have duplicate value for the email field.

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Please choose another value and put this in place.

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Now we're handling the duplicate error and essentially we're sending back more friendly user response.