nestjs-patterns
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How to install nestjs-patterns?
sabahattink/antigravity-fullstack-hq/nestjs-patterns
$npx -y skills add sabahattink/antigravity-fullstack-hq --skill nestjs-patternsNestJS best practices, module architecture, DTOs, Guards, Interceptors, and common patterns. Use when building or reviewing NestJS backend services.
SKILL.md
| 1 | # NestJS Patterns |
| 2 | |
| 3 | ## Module Structure |
| 4 | |
| 5 | ``` |
| 6 | src/modules/users/ |
| 7 | ├── users.module.ts |
| 8 | ├── users.controller.ts |
| 9 | ├── users.service.ts |
| 10 | ├── dto/ |
| 11 | │ ├── create-user.dto.ts |
| 12 | │ └── update-user.dto.ts |
| 13 | ├── entities/ |
| 14 | │ └── user.entity.ts |
| 15 | └── guards/ |
| 16 | └── user-owner.guard.ts |
| 17 | ``` |
| 18 | |
| 19 | ## Key Patterns |
| 20 | |
| 21 | ### Module Definition |
| 22 | |
| 23 | ```typescript |
| 24 | @Module({ |
| 25 | imports: [PrismaModule], |
| 26 | controllers: [UsersController], |
| 27 | providers: [UsersService], |
| 28 | exports: [UsersService], |
| 29 | }) |
| 30 | export class UsersModule {} |
| 31 | ``` |
| 32 | |
| 33 | ### DTOs with Validation |
| 34 | |
| 35 | ```typescript |
| 36 | import { IsEmail, IsString, MinLength } from 'class-validator' |
| 37 | |
| 38 | export class CreateUserDto { |
| 39 | @IsEmail() |
| 40 | email: string |
| 41 | |
| 42 | @IsString() |
| 43 | @MinLength(8) |
| 44 | password: string |
| 45 | } |
| 46 | ``` |
| 47 | |
| 48 | ### Service Pattern |
| 49 | |
| 50 | ```typescript |
| 51 | @Injectable() |
| 52 | export class UsersService { |
| 53 | constructor(private readonly prisma: PrismaService) {} |
| 54 | |
| 55 | async create(dto: CreateUserDto) { |
| 56 | return this.prisma.user.create({ data: dto }) |
| 57 | } |
| 58 | |
| 59 | async findOne(id: string) { |
| 60 | const user = await this.prisma.user.findUnique({ where: { id } }) |
| 61 | if (!user) throw new NotFoundException() |
| 62 | return user |
| 63 | } |
| 64 | } |
| 65 | ``` |
| 66 | |
| 67 | ### Controller Pattern |
| 68 | |
| 69 | ```typescript |
| 70 | @Controller('users') |
| 71 | export class UsersController { |
| 72 | constructor(private readonly usersService: UsersService) {} |
| 73 | |
| 74 | @Post() |
| 75 | @HttpCode(HttpStatus.CREATED) |
| 76 | create(@Body() dto: CreateUserDto) { |
| 77 | return this.usersService.create(dto) |
| 78 | } |
| 79 | |
| 80 | @Get(':id') |
| 81 | @UseGuards(JwtAuthGuard) |
| 82 | findOne(@Param('id') id: string) { |
| 83 | return this.usersService.findOne(id) |
| 84 | } |
| 85 | } |
| 86 | ``` |
| 87 | |
| 88 | ### Guards |
| 89 | |
| 90 | ```typescript |
| 91 | @Injectable() |
| 92 | export class JwtAuthGuard extends AuthGuard('jwt') {} |
| 93 | |
| 94 | @Injectable() |
| 95 | export class ResourceOwnerGuard implements CanActivate { |
| 96 | canActivate(context: ExecutionContext): boolean { |
| 97 | const request = context.switchToHttp().getRequest() |
| 98 | return request.user.id === request.params.id |
| 99 | } |
| 100 | } |
| 101 | ``` |
| 102 | |
| 103 | ### Custom Decorators |
| 104 | |
| 105 | ```typescript |
| 106 | export const CurrentUser = createParamDecorator( |
| 107 | (data: string, ctx: ExecutionContext) => { |
| 108 | const request = ctx.switchToHttp().getRequest() |
| 109 | return data ? request.user?.[data] : request.user |
| 110 | }, |
| 111 | ) |
| 112 | |
| 113 | // Usage: @CurrentUser() user or @CurrentUser('id') id |
| 114 | ``` |
| 115 | |
| 116 | ## Forbidden Patterns |
| 117 | |
| 118 | - Business logic in controllers |
| 119 | - Returning sensitive data (passwords) |
| 120 | - No validation on inputs |
| 121 | - Hardcoded secrets |
| 122 | - Skipping error handling |
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