Node JS Framework

Query parameters can be accessed through req.query. For example: You can access http://localhost:3000/search?q=express to see the results.

Express can render dynamic HTML pages using template engines like EJS, Pug, or Handlebars. a. Installing a Template Engine For EJS, install it with npm: Set up EJS in app.js: Create a views directory and add an index.ejs file: Render the template in your route:

Express supports modular routing, which can help organize your code better. a. Creating Router Modules You can create a separate file for your routes. For example, create a file named userRoutes.js: In your app.js:

Middleware functions are a core feature of Express.js. They can be used to handle requests, modify request and response objects, end requests, and call the next middleware function in the stack. a. Creating Custom Middleware Here’s an example of custom middleware that logs the request method and URL: b. Error Handling Middleware In Express, error […]

Express can use various middleware for functionalities like authentication, logging, etc. For example, to use the morgan logging library: Then, in app.js:

To serve static files like HTML, CSS, and JavaScript, use: Create a public directory and put your static files there.

Add an error handling middleware to catch and respond to errors:

You can add more routes to handle different URLs and HTTP methods. For example:

Start your server using Node.js: Visit http://localhost:3000 in your browser to see “Hello World!” and use a tool like Postman or curl to test the /data POST endpoint.