JWT

    npm install --save @nestjs/jwt

Messages

    export const Messages = {
      jwt_secret: 'secret123',
    };

Declare JwtModule

    import { Module } from '@nestjs/common';
    import { AuthService } from './auth.service';
    import { UsersModule } from '../users/users.module';
    import { JwtModule } from '@nestjs/jwt';
    import { AuthController } from './auth.controller';
    import { Messages } from './constants';

    @Module({
    imports: [
        JwtModule.register({
            global: true,
            secret: Messages.secret,
            signOptions: { expiresIn: '60s' },
        }),
    ],
    providers: [AuthService],
    controllers: [AuthController],
    exports: [AuthService],
    })
    export class AuthModule {}