After reading last post let's see types of middleware in ExpressJs ,Middleware comes in different flavours(๐), each serving a unique purpose
1. Application-level Middleware: This is like the main ingredient. You add it to your whole application, and it runs on every request.๐ซก
app.use((req, res, next) => {
console.log('This runs on every request!');
next();
});
2. Router-level Middleware: This is more like a specialty topping. Itโs used for specific routes or groups of routes.๐ค
const router = express.Router();
router.use('/special', (req, res, next) => {
console.log('Special route middleware!');
next();
});
3. Built-in Middleware: These are like pre-made sauces that come with Express, such as express.json() for parsing JSON. ๐
app.use(express.json());
4. Error-handling Middleware: This is the chefโs secret weapon. It catches any errors and serves up a custom response. ๐
app.use((err, req, res, next) => {
console.error(err.stack);
res.status(500).send('Something broke!');
});
The Power of Composing Middleware ๐ซฑ๐ปโ๐ซฒ๐ฝ
One of the coolest things about middleware is that you can stack them together to create complex workflows. Each middleware function can either end the request-response cycle or pass control to the next function using next(). This makes it easy to add features like authentication, logging, error handling, and moreโjust like adding layers to your sandwich.
Hereโs how you might use middleware to protect a route:
const authenticate = (req, res, next) => {
if (req.isAuthenticated()) {
return next();
}
res.redirect('/login');
};
app.get('/dashboard', authenticate, (req, res) => {
res.send('Welcome to your dashboard!');
});
In this example, the authenticate middleware checks if the user is authenticated before allowing them to access the dashboard.
*Conclusion: Middleware Mastery ๐ฉ๐ปโ๐ณ *
Middleware is truly the secret sauce of Express.js, adding layers of functionality to your Node.js applications. Whether youโre handling requests, managing responses, or catching errors, mastering middleware will make your code cleaner, more organised, and a lot more powerful.
So next time youโre building an Express.js app, think about the flavors you can add with middleware. Mix, match, and create your own secret sauceโitโs what makes your application uniquely yours!
Happy Cฬถoฬถoฬถkฬถiฬถnฬถgฬถ Coding! ๐ซถ๐ป
Top comments (14)
Absolutely loved this post! ๐
The way you compared the different types of middleware in Express.js to flavors and ingredients really made the concept come alive! ๐ด The analogy of middleware as layers in a sandwich or secret sauces in cooking is a perfect way to explain how middleware works in Expressโespecially for those who might be newer to the framework.
I particularly liked how you broke down the different types like application-level, router-level, and error-handling middleware with relatable examples. It makes understanding and implementing them so much easier! The section on composing middleware really highlights how powerful Express.js can be when it comes to creating flexible and reusable code. It feels like you've truly mastered the art of making middleware fun and approachable. ๐ฉ๐ปโ๐ณ
Looking forward to more of your insightful and engaging posts! Keep up the amazing work! ๐
Sure @aaditya_vikram Stay connected ! ๐๐ป
Such a informative blog๐ฅ
Khushi Patel ! This was really a difficult part for me. But your valuable sauce solved my problem ๐
I am glad to here that this helps you
I am actually beginner in MERN stack and i just learn new concepts. if i need your help please guide me... thanks
I am coder by passion and creative by heart ! ๐๐ซฃ
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Great efforts ๐
During formatting (conclusion part) AI did some mistake (markup related)
Which mistake?
hahaha
because most of these GPT or LLM's gives output in markdown format
*Conclusion: Middleware Mastery ๐ฉ๐ปโ๐ณ *
AI (Probably ChatGPT gives output in markdown format
so this title was supposed to be in bold format.
however you're helping many devs by sharing such valuable information
keep in up.
๐๐๐๐
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