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May 21, 2025•5 min read

Enabling CORS in NestJS for Production: A Secure and Practical Guide

Deploying a NestJS API to production often triggers CORS errors—like “No ‘Access-Control-Allow-Origin’ header is present”—when your frontend or third-party clients live on a different domain. Using app.enableCors() with a secure configuration—restricting origins via an environment-driven whitelist, specifying allowed methods, and enabling credentials only when needed—ensures your API remains both accessible and protected.

May 20, 2025•7 min read

Building Type-Safe Nuxt 3 Apps: Combining Composables, Pinia, and TypeScript for Scalable Authentication

Learn how to build a type-safe authentication system in Nuxt 3 using composables and Pinia, with TypeScript ensuring robust, scalable code. This tutorial walks you through creating a reusable useAuth composable that’s SSR-friendly and easy to integrate.

April 16, 2025•8 min read

Why NestJS Uses DTOs and Interfaces: Unlocking Their Power with class-transformer

NestJS uses interfaces for type safety and DTOs for runtime validation and transformation. While interfaces vanish at compile time, DTOs—enhanced by class-transformer—ensure clean, secure API data handling. Used together, they create robust and maintainable code.

May 1, 2025•11 min read

Using Environment Variables in NestJS AppModule for Database Connections: A Complete Guide

Learn how to securely manage PostgreSQL connections in your NestJS app by using environment variables with @nestjs/config. This guide walks you through setting up a .env file, dynamically injecting values into TypeOrmModule, and validating your config with joi—all while avoiding hardcoded credentials and ensuring a clean, scalable setup.

May 6, 2025•9 min read

NestJS Interceptors vs. Middleware vs. Exception Filters: What’s the Difference and How They Work Together

Learn the key differences between Middleware, Interceptors, and Exception Filters in NestJS. This guide breaks down how each works, when to use them, and how they can be combined to build clean, maintainable APIs.

May 18, 2025•9 min read

How to Inject a NestJS Service from Another Module: A Step-by-Step Guide

Struggling to inject a service from another module in your NestJS app? This guide simplifies the process, solving errors like Nest can't resolve dependencies. Learn how to export a service (e.g., UsersService), import its module into another (like AuthModule), and inject it seamlessly for modular, scalable applications. Follow clear steps and avoid pitfalls like missing exports or circular dependencies to keep your project running smoothly.

May 19, 2025•12 min read