.js
§§ 1000
const express = require('express');
const app = express();
const port = 3000;

// Set up the server so that it can parse JSON requests.
app.use(express.json());

app.get('/', (req, res) => {
res.send({ hello: 'world' });
});

app.listen(port, () => console.log(`Listening on port ${port}`));
§§ FILE src/server.js
§§ 1000
const express = require('express'); // import the express library into our file and save it in a variable called express - this is a commonJS module system (not ES6 import) - this is how node works - we are importing something from node_modules folder - we are using the require keyword to import something from another file or library - the argument of the require function is the name of the library we want to import (in this case 'express') - we are saving it in a variable called express so that we can use it later on in our code - this is how node works and how you can use 3rd party libraries in your node projects // Set up the server so that it can parse JSON requests. app.use(express.json()); // create a route handler for the root route ('/') app.get('/', (req, res) => { res.send({ hello: 'world' }); }); // start our server on port 3000 app.listen(port, () => console.log(`Listening on port ${port}`)); // export our server so that we can use it in other files if needed module.exports = app; // now run `node src/server` in your terminal to start your server! // now you should be able to go to http://localhost:3000 and see your hello world message! // try adding more routes and logic to your server! have fun! :)
const app = express(); // create an instance of an Express application and save it in a variable called app - this will be used for all of our routes and logic for our application - Express is a web framework for Node that makes creating web servers easier by providing us with helpful methods like .get(), .post(), .put(), etc... which allow us to easily create routes and handle requests from clients const port = 3000; // set a constant called port which will be used when starting up our server later on
§§ COM2 update src/server2 file with more comments about what each line does - added comments about exporting our server so that we can use it in other files if needed - added comment about running `node src/server` to start the server and going to http://localhost:3000 to see the hello world message! - added comment about trying adding more routes and logic to your server! have fun :)
§§ --- dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/server2-dist/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp/.tmp./src./src./src./src./src./src./src./src./src./src./src../../../../../../../../../..//..//..//..//..//..//..//..//..//..//..//..//..//..//..//..///////s////////s////////s////////s////////s////////s////////s////////s///////erver.jserver.jserver.jserver.jserver.jserver.jserver