On Developpez.com, navigate to the Node.js tutorials section. Find an article or tutorial about Express.js and identify the common command used to install Express.js, along with a basic code snippet for creating an Express application instance to set up a simple server. Provide both.
Navigate to 'https://www.developpez.com/' Click on the 'Dév. Web' link. On the 'Dév. Web' page, click on the 'NodeJS' link. From the Node.js section, click on the 'Tutoriels' link. Browse the Node.js tutorials to find an article related to Express.js. Within the relevant article, locate and identify the command for installing Express.js. Locate and identify the basic code snippet or method for creating an Express application instance for a server setup. State the identified installation command and the code snippet.
Successfully navigate to the Node.js tutorials section of Developpez.com. Identify and state the Express.js installation command (e.g., 'npm install express'). Identify and state a code snippet or method for creating an Express application instance (e.g., 'const express = require("express"); const app = express();' or 'var app = express.createServer();').