How to return Exceptions in Nest js - nestjs

Question

I am new to Nest js and I wonder what the best place to return your exceptions and success responses is it from the controller or from a service. This is what I have implemented and I want to know what will be the best practice to handle and send API responses to the client. Shall I return every success and error responses from the controller or from the service?
Controller:
#Post('sign-up')
#HttpCode(200)
async signUp(#Body() request: ISignUpDto) {
const user = await this._authService.createUser(request);
console.log(user);
const otpLength = user.otp.toString().length;
return {
message: `We've e-mailed you a ${otpLength} digit OTP. Please check your e-mail and complete the verification.`,
dataset: null,
};
}
Service:
public async createUser(request: ISignUpDto): Promise<User> {
const isUserExist = await this.isUserExist(request.email);
if (isUserExist) {
throw new BadRequestException({
dataset: null,
message: 'The provided e-mail is already in use by an existing user.',
});
} else {
const hashedPassword = await hashPassword(request.password);
const user = await this._prisma.user.create({
data: {
active: false,
otp: generateOTP(6),
email: request.email,
password: hashedPassword,
firstName: request.firstName,
lastName: request.lastName,
gender: request.gender ? request.gender : null,
dateOfBirth: request.dateOfBirth
? request.dateOfBirth
: null,
},
select: {
id: true,
email: true,
firstName: true,
lastName: true,
gender: true,
dateOfBirth: true,
otp: true,
active: true,
createdAt: true,
},
});
await this.sendSignUpVerificationEmail(user.email);
return user as User;
}
}