Using External Middleware
Express can use various middleware for functionalities like authentication, logging, etc. For example, to use the morgan logging library: Then, in app.js:
Serving Static Files
To serve static files like HTML, CSS, and JavaScript, use: Create a public directory and put your static files there.
Error Handling
Add an error handling middleware to catch and respond to errors:
Adding More Routes
You can add more routes to handle different URLs and HTTP methods. For example:
Run Your Application
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.
Create Your First Express Application
Create a file named app.js (or index.js) in your project directory and add the following code:
Install Express.js
Install Express.js using npm.
Initialize a New Node.js Project
Run the following command to create a package.json file, which will manage your project’s dependencies.
Setup Your Environment
a. Install Node.js Download and install Node.js from nodejs.org. This will include npm (Node Package Manager), which you’ll use to manage packages. b. Create a Project Directory