NestJS Middleware: Request and Response Logging

When building modern web applications, understanding how data flows through your API is crucial for troubleshooting and performance tracking. Without proper logging, diagnosing failed requests or unexpected payloads in production becomes a guessing game. This course teaches you how to intercept and log incoming HTTP requests and outgoing responses using custom middleware in NestJS. You will learn how to design a structured logging solution that captures essential metadata without degrading application performance. We start with the core architectural concepts of NestJS middleware, explore how to access request and response objects, and move on to implementing modern logging best practices. What you'll learn: - Understand the fundamentals of NestJS middleware and its execution lifecycle - Create a custom, reusable logger middleware class from scratch - Extract critical HTTP metadata including methods, status codes, and execution time - Register middleware globally or scope it to specific application routes - Apply structured logging principles using the built-in NestJS Logger class - Integrate modern logging practices to ensure secure handling of sensitive user data This course begins with foundational concepts, establishing a clear understanding of the NestJS request-response lifecycle before guiding you through step-by-step implementation. You will explore practical code examples, learn how to configure middleware dynamically, and discover how to structure your logs for modern observability tools. This course is designed for backend developers, API designers, and Node.js engineers who want to improve their NestJS debugging workflows. Basic familiarity with TypeScript and NestJS fundamentals is recommended, but no prior experience with middleware or advanced logging libraries is required. Start reading to build cleaner, more observable NestJS applications today.