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Articles tagged with #backend
How does a server know who you are on every request? Many beginners think the server remembers them after login. That's not true. HTTP is stateless. Every request arrives like a stranger, with no memo
Where do uploaded files go after Multer saves them? Many beginners think an uploaded file lives inside the request, or inside the database. That's not true. A file is just bytes written to a disk. You
Why can't Express read a file upload on its own? You build a form with a file input. You submit it. You log req.body. It is empty. Many beginners think Express is broken or that it express.json() shou
What happens to a request before it reaches your route? You send a request to /api/users. Your route handler sends back a response. Many beginners think the request goes straight from the browser to t
How does Express know which user you want, and how do you filter the results? You open /users/42 and get one user. You open /search?q=laptop&sort=price and get a filtered list. Both look like normal U
Why Does Everyone Use Express Instead of Plain Node.js? Many beginners think Express is some separate framework that replaces Node.js entirely - like choosing React instead of vanilla JavaScript. That
