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Writing Maintainable, Scalable, and Readable TypeScript Code

Table of Contents Introduction to Code Maintainability Principles of Maintainable TypeScript Code Key Practices for Writing Scalable TypeScript Code Enhancing Readability in TypeScript Code Structuring TypeScript Projects for Scalability Advanced...

Monorepos with TypeScript: Nx, Turborepo Basics

Table of Contents What is a Monorepo? Benefits of Monorepos Overview of Nx and Turborepo What is Nx? What is Turborepo? Setting Up a Monorepo with Nx Setting Up a Monorepo...

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Linting and Formatting: ESLint + Prettier for TypeScript

Table of Contents Introduction Why Linting and Formatting Are Critical What is ESLint? What is Prettier? How ESLint and Prettier Work Together Setting Up ESLint in a TypeScript Project Installing Dependencies Configuring...

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Clean Code Principles and Best Practices for TypeScript

Table of Contents Introduction Why Clean Code Matters Core Clean Code Principles Meaningful Names Small, Focused Functions Single Responsibility Principle (SRP) Avoiding Side Effects Favor Composition Over Inheritance DRY (Don’t Repeat Yourself) KISS (Keep...

Event-Driven Programming with Typed Events in TypeScript

Table of Contents Introduction What is Event-Driven Programming (EDP)? Why Typed Events Matter Building a Simple Event System in TypeScript Defining Typed Event Interfaces Creating an Event Emitter Class Subscribing, Emitting,...

Domain-Driven Design (DDD) Basics in TypeScript

Table of Contents Introduction What is Domain-Driven Design (DDD)? Core Concepts of DDD Entities Value Objects Aggregates Repositories Services Structuring a DDD Project in TypeScript Example: Building a Simple DDD Module in TypeScript Best Practices...

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Building a Chat App with Gateway, Rooms, and Events in NestJS

Real-time chat applications are a perfect use case for WebSockets. In this module, we'll build a basic chat app using NestJS WebSocket Gateways, Socket.IO...

WebSockets in NestJS with @nestjs/websockets

In the modern web, real-time communication is increasingly becoming a necessity. Whether it's a live chat app, real-time analytics dashboard, multiplayer game, or stock...

Middleware vs Guard for Auth Handling in NestJS

When building secure applications with NestJS, authentication plays a central role. Two common mechanisms used for request-level processing are Middleware and Guards. Both can...

Using Sessions and Cookies in NestJS: Persistent Login and Secure State Management

While JWTs are a popular method for authentication in modern APIs, sessions and cookies remain a secure and viable solution — especially in traditional...

Role-Based Access Control (RBAC) and Guards in NestJS

Controlling access to resources based on user roles is a fundamental security practice in modern application development. In NestJS, Guards offer a clean and...

Refresh Tokens and Token Rotation in NestJS: Secure JWT Authentication

As you build secure applications with NestJS and JWT authentication, one critical concern is token expiration. Access tokens should have short lifespans for security,...

Passport Strategies in NestJS: JWT, Local, OAuth2, and Google Login

NestJS integrates seamlessly with Passport.js, a popular Node.js middleware for authentication. Passport provides a rich ecosystem of strategies that you can plug into your...

JWT Authentication in NestJS: Login, Signup, and Protected Routes

Authentication is a fundamental part of most modern web applications. In this module, you'll learn how to implement JWT (JSON Web Token) based authentication...

Pagination, Filtering, and Query Optimization in NestJS

When working with APIs that return large datasets, it's essential to provide mechanisms like pagination, filtering, and query optimization. These strategies not only enhance...

Writing Unit and Integration Tests for Services with Database Access in NestJS

Testing is an essential part of building reliable and maintainable NestJS applications. When working with database-driven services, it's crucial to validate not just isolated...

Database Transactions in NestJS: A Complete Guide

Database transactions are critical when you need to ensure that a series of operations either all succeed or all fail together. This becomes especially...

Schema Relationships and Migrations in NestJS

In a relational database, schema relationships define how different tables (entities) are connected to each other. Understanding these relationships is crucial when designing a...