Gain insights into Express.js essentials—routing, middleware, and RESTful APIs. Learn to integrate MongoDB, JWT authentication, validation, real-time features, and logging for scalable back-end apps.

express.tar.gz

JWT_SECRET

NODE_ENV

Express App

Express code

Express code-module

Express code-silent

Express App-p4000

Express App-test

Express App-database

Express App-database-tmux

Express App-uploads

Express-mysql

Express.js is a popular Node.js framework, especially useful for building APIs and server-side apps. It’s lightweight, unopinionated, and flexible, giving you full control over how your app is structured. Whether new to backend development or ready to build production-grade services using JavaScript, Express is a great place to start.

In this course, you’ll begin with a quick review of Node.js and asynchronous JavaScript. Then, you’ll cover Express.js essentials like routing, middleware, and modular app structure. You’ll learn to build RESTful APIs, connect your app to a database, and implement JSON web tokens (JWT) authentication. You’ll also explore validation and sanitization for added security. Finally, you’ll understand templating engines, real-time features using Socket.IO, and structured logging using Winston.

After completing this course, you’ll have a solid grasp of Express.js and the confidence to build secure, scalable, production-ready backend applications from scratch.

Learn Express.js

How can you access query parameters from a request in Express.js?

How can you access query parameters from a request in Express.js?

Which method would you use to set an HTTP status code before sending a response?

Which method would you use to set an HTTP status code before sending a response?

What is the output when a request is made to `/greet?name=John` using the following code?
```javascript
app.get("/greet", (req, res) => {
  const name = req.query.name || "guest";
  res.json({ message: `Hello ${name}!` });
});
```

What is the output when a request is made to <code>/greet?name=John</code> using the following code?
<pre><code class="language-javascript">app.get(&quot;/greet&quot;, (req, res) =&gt; {
 const name = req.query.name || &quot;guest&quot;;
 res.json({ message: `Hello ${name}!` });
});
</code></pre>

Which response method would you use to serve a static file from the server?

Which response method would you use to serve a static file from the server?

URL path, middleware, database connection

Client request, server response, database query

What are the three key components of an Express.js route?

What are the three key components of an Express.js route?

Which HTTP method should you use to retrieve data from the server?

Which HTTP method should you use to retrieve data from the server?

Passes control to the next middleware or route handler

What is the purpose of the `next()` function in an Express.js route handler?

What is the purpose of the <code>next()</code> function in an Express.js route handler?

`POST` requests are used to retrieve data from the server.

`POST` requests typically send data in the request body.

`POST` requests must always include query parameters.

`POST` requests automatically delete resources from the server.

Which statement about `POST` requests in Express.js is *true*?

Which statement about <code>POST</code> requests in Express.js is true?

Which method is used to register middleware in an Express application?

Which method is used to register middleware in an Express application?

What parameters does an Express middleware function receive?

What parameters does an Express middleware function receive?

In the order they are registered using `app.use()`

Only after all route handlers have executed, regardless of the order in which they’re defined


In what order does Express execute middleware functions?

In what order does Express execute middleware functions?

`app.route(middlewareFunction, "/route")`

`app.applyMiddleware("/route", middlewareFunction)`

How can you apply middleware to a specific route in Express?

How can you apply middleware to a specific route in Express?

Reinforce your understanding of Express.js fundamentals with a quick quiz covering the request-response cycle, routing, and middleware.

Course Orientation and Preparations

Getting Started with Express.js

Diving Deeper into Routing

Mastering Middleware

Building RESTful APIs and Integrating Databases

Securing Your Express Applications

Beyond APIs: UI Rendering, Real-Time Communication, and Logging in Express

DevConnector Project

Conclusion

Quiz: Express.js Fundamentals