question: Casting Json to the required datatype about class-transformer HOT 3 OPEN

Hi Ahmed,

This answer is a bit late, but hopefully it can be helpful!

You can use @Type(() => String) decorator to force type conversion to String in your case!

Your class would look like this:

export class Restaurant {
  @Type(() => String)
  accountNumber?: string;
  @Type(() => Number)
  monthlyVolume?: number;
  @Type(() => String)
  printingTicketEnabled?: string;
  @Type(() => Boolean)
  royalPartner?: boolean;
}

If you need a custom transformer you can read more here

Note: The plainToClass and classToPlain are marked as deprecated. You should use plainToInstance and instanceToPlain respectively.
Note2: The plainToInstace and instanceToPlain functions work with array as well! So you don't need the Array.map.

from class-transformer.