Validation on optional Parameter using class-validator in nestjs?

Question

I want to apply validation on request payload like, there is field name with string type. But name is not compulsory field but if it exist it must execute @IsNotEmpty()

I tried something like this @IsNotEmpty() name?: string // it not considering ? optional constraint

Answer 1

You can use the @IsOptional() validator:

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