What is Middleware? | Explained with real file upload API Flow
What really happens before your backend code runs?
In this video, we break down what middleware is, why it’s essential in backend systems, and walk you through a real-world example using a file upload API.
You’ll learn:
How middleware works in Express.js, Spring Boot, and NestJS
Why things like auth, file parsing, virus scanning, and logging happen before your main logic
The exact order of middleware and how each one protects your app
🔧 Code examples included - Node.js, multer, virus scan middleware, and more!
🎯 Perfect for backend developers, beginners, and those preparing for system design or interviews.
👉 Next video: We’ll go deeper into the business logic layer where your app talks to databases, APIs, and microservices.
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