Build a web API with Node.js and Express

Author: ShubhamVerma-Developer

Build a web API with Node.js and Express/unit 1 Introduction.md

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+Building a web API with Node.js and Express is a common task. Below is a simple example to get you started:
+
+1. First, make sure you have Node.js and npm installed on your machine.
+
+2. Create a new directory for your project and navigate to it in your terminal.
+
+3. Initialize a new Node.js project by running:

Build a web API with Node.js and Express/unit 2 Create a new Express framework web application/Create a new Express framework web application.md

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+# Web servers and web applications
+
+A web server is a piece of software that responds to requests from clients. A web application sits on top of the web server. Some environments, like Node.js, provide both the web server and the web application in a framework. In this module, the web server is provided by the HTTP module. The web application is provided by the Express.js framework and includes the web server.
+
+Learn more:
+
+- Web applications: The application delivers a web app to the client:
+  Visually with HTML, CSS, and JavaScript
+  Data with APIs
+  Both visual and data with a combination of HTML, CSS, JavaScript, and APIs. This is considered a monolithic application.
+- URL Routing: URL routing is a mechanism to provide functionality of the web server when a specific URL address is requested. For example, the URL /products might be associated with a function that returns a list of products. The URL /products/1 might be associated with a function that returns a specific product.
+- HTTP Headers: These are key-value pairs that are sent from the client to the server. They contain information about the request or response.
+  Support for different content types: A client can request data in a specific format and may return in that format such as plain text, JSON, HTML, or CSV.
+  Authentication/Authorization: Some data might be sensitive. A user might need to sign in or have a specific role or permission level to access the data. This is handled in the HTTP header.
+- Data exchange: Users may need to view and add data to the system. To add data, users might enter data in a form or upload files.
+  Time to market: To create web applications and APIs efficiently, choose tools and frameworks that provide solutions to common problems. These choices help the developer quickly meet the business requirements of the job.
+
+## HTTP module in Node.js

Build a web API with Node.js and Express/unit 2 Create a new Express framework web application/index.js

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+// Include the HTTP module
+const http = require("http");
+
+// Set the port to 3000
+const PORT = 3000;
+
+// 1. Process incoming requests (req), reply with response (res)
+const requestHandler = (req, res) => {
+  res.writeHead(200, { "Content-Type": "text/plain" });
+  res.end("hello world");
+};
+
+// 2. Create a server with the requestHandler
+const server = http.createServer(requestHandler);
+
+// 3. Start listening for incoming requests on port
+server.listen(PORT, () => {
+  console.log(`listening on port ${PORT}`);
+});

Build a web API with Node.js and Express/unit 3 Exercise - Create a new Express web application/node-essentials

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+Subproject commit e17b32216df5123cc679c6c8505aa96989805368