What is the process for generating an HTTP response that results in a pipe error being thrown

Question

What is the process for generating an HTTP response that results in a pipe error being thrown

In my NestJS application, I have created a custom pipe that validates if a given value is a valid URL. If the URL is invalid, an error is thrown. This pipe is utilized in a controller to save an item into the database.

Recently, I discovered that the pipe was returning a 500 Internal Server Error response, prompting me to check the server logs to confirm if it originated from the pipe itself.

I am curious if there is a way to generate an HTTP response directly with a specific message instead of just throwing an error?

The code snippet for the pipe implementation:

import { BadRequestException, Injectable, PipeTransform } from '@nestjs/common';

@Injectable()
export class ValidUrlPipe implements PipeTransform {
  transform(website: string) {
    if (website === '') return website;

    const validProtocols = ['http:', 'https:'];

    const { protocol } = new URL(website);
    if (validProtocols.includes(protocol)) {
      return website;
    }

    throw new BadRequestException(`invalid website value: ${website}`);
  }
}

Here's how the controller utilizes the pipe:

  @Post()
  create(
    @Body('website', ValidUrlPipe) website: string,
    @Body() createTvDto: CreateTvDto,
    @CurrentUser() user: User,
  ) {
    return this.televisionsService.create(user._id, createTvDto);
  }

Appreciate any suggestions or solutions you may have regarding this issue. Thank you in advance!

https://i.stack.imgur.com/zQPMr.png

EDIT: Added an image showing the error received when using Postman to call the endpoint

javascript nestjs pipe httpresponse

Answer 1

Answer №1

Hey Dora, I've got the perfect solution for you:

import { BadRequestException, Injectable, PipeTransform } from '@nestjs/common';

@Injectable()
export class ValidUrlPipe implements PipeTransform {
  transform(website: string) {
    if (website === '') return website;

    const validProtocols = ['http:', 'https:'];

    try {
      const { protocol } = new URL(website);
      if (validProtocols.includes(protocol)) {
        return website;
      }
    } catch (error) {
      // Feel free to add additional logging for your own reference
      throw new BadRequestException(`invalid website value: ${website}`);
    }
  }
}

Especially for those using Node 20:

You can simplify things by utilizing the static method URL.canParse().

This implementation is for your pipe:

import { BadRequestException, Injectable, PipeTransform } from '@nestjs/common';

@Injectable()
export class ValidUrlPipe implements PipeTransform {
  transform(website: string) {
    if (website === '') return website;

    const validProtocols = ['http:', 'https:'];

    if (URL.canParse(website)) { 
       // URL.canParse(...) returns a boolean indicating if the url is valid or not
       const { protocol } = new URL(website);
       if (validProtocols.includes(protocol)) {
         return website;
       }
    }
    throw new BadRequestException(`invalid website value: ${website}`);
  }
}

Answer 2

Hey Dora, I've got the perfect solution for you:

import { BadRequestException, Injectable, PipeTransform } from '@nestjs/common';

@Injectable()
export class ValidUrlPipe implements PipeTransform {
  transform(website: string) {
    if (website === '') return website;

    const validProtocols = ['http:', 'https:'];

    try {
      const { protocol } = new URL(website);
      if (validProtocols.includes(protocol)) {
        return website;
      }
    } catch (error) {
      // Feel free to add additional logging for your own reference
      throw new BadRequestException(`invalid website value: ${website}`);
    }
  }
}

Especially for those using Node 20:

You can simplify things by utilizing the static method URL.canParse().

This implementation is for your pipe:

import { BadRequestException, Injectable, PipeTransform } from '@nestjs/common';

@Injectable()
export class ValidUrlPipe implements PipeTransform {
  transform(website: string) {
    if (website === '') return website;

    const validProtocols = ['http:', 'https:'];

    if (URL.canParse(website)) { 
       // URL.canParse(...) returns a boolean indicating if the url is valid or not
       const { protocol } = new URL(website);
       if (validProtocols.includes(protocol)) {
         return website;
       }
    }
    throw new BadRequestException(`invalid website value: ${website}`);
  }
}

Answer 3

Answer №2

The issue you're facing is with the new URL() function throwing an error. One way to handle this is by enclosing it in a try/catch block to convert it into the desired BadRequestException for throwing. Alternatively, you could consider using a simple regular expression /https?:\/\//.test(website) to ensure that the provided website is a valid HTTP or HTTPS link.

Answer 4

The issue you're facing is with the new URL() function throwing an error. One way to handle this is by enclosing it in a try/catch block to convert it into the desired BadRequestException for throwing. Alternatively, you could consider using a simple regular expression /https?:\/\//.test(website) to ensure that the provided website is a valid HTTP or HTTPS link.

Answer 5

Answer №3

When using the line

const { protocol } = new URL(website);

, it's important to note that an error will be thrown if the website parameter is not a valid URL. To prevent this, consider implementing validation to check if the parameter is indeed a valid URL. Additionally, incorporating a try/catch block can help in catching errors and returning appropriate exceptions.

Answer 6

When using the line

const { protocol } = new URL(website);

, it's important to note that an error will be thrown if the website parameter is not a valid URL. To prevent this, consider implementing validation to check if the parameter is indeed a valid URL. Additionally, incorporating a try/catch block can help in catching errors and returning appropriate exceptions.

What is the process for generating an HTTP response that results in a pipe error being thrown

Answer №1

Answer №2

Answer №3

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