typescript-nestjs

Structure a scalable NestJS backend by organizing code into modules, controllers, services, and DTOs. Use Prisma for PostgreSQL queries with explicit selects, dependency injection, guards, and interceptors to ensure maintainable production-grade applications.

Handle errors and validation in NestJS by implementing robust patterns across services and DTOs. Apply validation rules within DTOs and use interceptors to standardize error handling, ensuring consistent API responses and reliable backend architecture.

Write production-grade NestJS modules and controllers by following codified templates for dependency injection and request handling. Implement services with robust Prisma queries and explicit selects to separate business logic from routing concerns effectively.

Yes, you can use Prisma explicit selects to optimize PostgreSQL queries in NestJS. This pattern retrieves only necessary fields, reducing memory overhead and ensuring efficient data mapping within your service layer for scalable API development.

Use codified testing patterns to validate NestJS services and Prisma integrations. Apply templates that mock Prisma queries, test controller endpoints, and verify DTO validation rules to support robust, well-tested backend applications.

Implement guards and interceptors in a NestJS backend when you need to manage authentication, authorization, and request lifecycle transformations. Combine them with middleware and robust error handling to secure and standardize scalable API endpoints.