WEBVTT

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Hi everyone.

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In this video let me show you the core concept of Nest.js will be exception filters.

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Okay.

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Click on the exception filters right here.

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And where what is the exception filter?

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If you already built the API inside the expressjs framework we use the custom the error by hand,

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right?

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For example like bad request exception or unauthorized exception or internal exception.

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Right.

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But with but with NestJS, it's already have a some exceptions okay.

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By default it will be used the exception which will be the internal server.

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Okay.

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It also provides something like this.

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This is the global exception filter.

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And let me show you how we can throw the exceptions.

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Okay.

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Nestjs have a HTTP exception inside the nestjs/common.

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Okay.

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We can throw something like this.

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Let me show you.

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For example, I have a service right here.

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I get the data, but before I get the data, I will throw new.

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Let me see, HTTP exception, that it will be exception.

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Okay.

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We can use for with that.

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Let me be forbidden.

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And the status?

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The status is already had.

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Status.

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Inside the HTTP status.

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Constant status.

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from common right here.

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Okay.

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And .FORBIDDEN

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Like this.

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And I think I will open the postman to test this.

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Let me create and I will close the other tab.

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Okay.

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I use get method.

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And I will copy the endpoint here.

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Paste it, and if I send request, now you will see it has a forbidden http status code.

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And we some message right here.

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Very cool.

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Right.

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Now

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This here will be a

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Right here.

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I can change the message.

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For example.

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This one.

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Okay, let's see, if I send okay, we have the message, right?

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Very good.

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And, we can custom that, for example, I don't want the throw with the some arguments like this.

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I can easily create the custom exception.

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For exception.

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Okay.

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I can create a class called forbidden exception.

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And let me copy everything right here.

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Paste it's okay.

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Export a class.

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And make sure we will inherit from at the http exception.

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And import that okay.

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And right now, how we can use that.

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We can easily throw forbidden exception, from my exception

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Okay.

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Now, let me see, I can send.

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And it also work, right?

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Okay.

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Here is a video.

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And actually in the nestjs, it's already built-in the some exception for me.

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For example, like bad exception, unauthorized exception, not found forbidden.

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Uh, and many more.

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We can easily do that.

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For example, I can throw new BadRequestException with something like.

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Data not found, for example.

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Like this

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And if I send, you can see, it will have a message data not found and error and the 400

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Very cool.

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Right.

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So I think that's for the video.

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Let me show see.

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Okay.

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We have many more.

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And it have an internal server error.

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Internal server error reception.

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Very cool.

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And for that reason we doesn't need to custom.

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Okay.

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But if you want to custom you can you feel free to use in your case.

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Okay.

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And that's for the video.

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I will see you in the next one.