URL input validation NestJs

Question

I am trying an input validation on a website URL. I used the URL decorator but when I don't input any URL it gives me my error message. what should I do to make it accept empty string also?

  @ApiProperty()
  @IsString()
  @IsUrl(undefined, { message: 'Company URL is not valid.' })
  companyURL: string;

Answer 1

You can use the @IsOptional() class-validator or the @IsDefined(value: any).

@IsOptional()

Checks if given value is empty (=== null, === undefined) and if so, ignores all the validators on the property.

@IsDefined(value: any)

Checks if value is defined (!== undefined, !== null). This is the only decorator that ignores skipMissingProperties option.

If you need more information about it, check the documentation about class-validators