Skip to content

Latest commit

 

History

History
62 lines (41 loc) · 2.42 KB

middleware.md

File metadata and controls

62 lines (41 loc) · 2.42 KB
Raw

Middleware 📋

Middleware - Example Middleware Functions 🧠

What is Middleware? 🤔

Middleware functions are special functions that sit between the client’s request and the server’s response. They perform important tasks such as checking if a user is authorized, validating data, or logging information.

Purpose 🎯

This file contains middleware functions used to process requests before they reach the route handlers. Middleware functions can be used for logging, validation, and other request processing tasks.

Structure 🗂️

  • Each middleware function performs a specific action or set of actions on incoming requests.
  • Functions within this file are responsible for:
    • Logging Request Details: Recording information about each request for debugging purposes.
    • Validating Request Data: Ensuring that necessary fields are present in the request body for creating or updating records.

Example - exampleMiddleware.js 📦

  • logRequestDetails: Logs the HTTP method and URL of each incoming request. Useful for tracking and debugging requests.
  • validateExampleData: Checks if the name and description fields are present in the request body for POST and PUT requests. Responds with a 400 error if any fields are missing.

Usage 🚀

To use these middleware functions in your Express.js application, integrate them as follows:

const express = require('express');
const {
	logRequestDetails,
	validateExampleData,
} = require('./middleware/exampleMiddleware');

const app = express();

app.use(express.json()); // Middleware to parse JSON requests
app.use(logRequestDetails); // Apply logging middleware

// Define routes with validation middleware
app.post('/api/examples', validateExampleData, (req, res) => {
	// Create example logic
});

app.put('/api/examples/:id', validateExampleData, (req, res) => {
	// Update example logic
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
	console.log(`Server is running on port ${PORT}`);
});

Customization 🛠️

  • Modify the Function: Customize the exampleMiddleware function to suit your needs, such as adding authentication checks or logging more detailed information.

  • Add More Middleware: Feel free to add additional middleware functions to handle different aspects of request processing.

Explore and adjust the middleware functions as needed for your application’s requirements! 🔍