Nest.js · question
Q.06 of 44
What are DTOs and why are they important?
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Re-explain
DTOs (Data Transfer Objects) define the shape of data sent over the network. They provide type safety and validation.
export class CreateUserDto {
@IsString()
@IsNotEmpty()
name: string;
@IsEmail()
email: string;
@IsInt()
@Min(18)
age: number;
}
@Post()
createUser(@Body() createUserDto: CreateUserDto) {
return this.userService.create(createUserDto);
}
Benefits:
- Type safety
- Input validation
- API documentation
- Clear data contracts
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