WEBVTT

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Hi everyone.

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In this video I will show you how to validation.

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For the "DTO", Data transfer object and let's click on inside the validation topics here.

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Firstly we will install 2 packages right here.

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Let me copy.

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And the first one will be class validator for validation object and transformer.

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We will use that later okay let's focus on the class validator.

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If I scroll down a little bit right here, now you can see it has a some decorator.

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Something like this is email is not empty okay.

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This is from the class validator.

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And class validator library already provides some built-in validation rules.

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Right.

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For that reason we can use that.

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Let me show you in the createDto here.

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I will use @IsNotEmpty()

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And I will copy this and pass it inside the description.

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Let's see.

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Okay, let's see what happens if I use something like this, I will remove the title.

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And I send, you can see it's created right.

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And that's not what we want.

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The reason because we NOT.

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Let me see, let me scroll down a little bit.

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We NOT you the validation pipe right here.

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We must use the Global Pipes.

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Okay.

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Let me copy this line right here and go to the main.ts

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And right here I will pass this and validation pipe from.

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nestjs/common, okay

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Make sure we use the global pipe.

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And let me send again. Now you may see, it already format for me the message right here.

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Very cool.

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Right.

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If I remove the description also and I will send, this title should not be empty or description should

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not be empty.

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Right?

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Very cool.

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And in order to read more about the class validator you can search the class validator.

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Right here.

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Now you can see we have many more validator.

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For example a min or max is this is email, Len something like this right.

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You can read more about that and try a little bit with that.

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I will leave that job for you okay.

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And in this course we will use more and more class validator.

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Don't worry about that.

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And it's also very popular package right.

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So that's how we can validation.

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I will see you in the next one.