C:\temp>node > console.log("Hello Node!"); Hello Node!
test.js
C:\temp>node test.js Hello Node!
module.exports
object that is used to expose
objects
// hello.js var sayHello = function() { return 'Hello Node'; }; // Export object "hello" that is // the same as sayHello() module.exports.hello = sayHello;
require()
imports objects from module.exports
// Search for hello.js in the same directory var imported = require('./hello.js'); console.log(imported.hello()); // Hello Node
// config.js var config = { maxUnits: 100 }; module.exports = config;Get access to config's variables:
// server.js var config = require('./config.js'); console.log(config.maxUnits); // 100
npm
command-line tool to download and install
(Alt-F12 in WebStorm)
mkdirp
package
$gt; npm install mkdirp
require
function to load the module
// Search for node_modules/mkdirp.js or // node_modules/mkdirp/index.js var mkdirp = require('mkdirp'); // Create temp dir mkdirp('temp', function(err) { if (err) console.log(err); else console.log("dir was created"); });
package.json
package.json
:
{ "name": "mkdirp", "description": "Recursively mkdir, like `mkdir -p`", "version": "0.5.0", "author": { "name": "James Halliday", "email": "mail@substack.net", "url": "http://substack.net" }, etc... }
// server.js var http = require('http'); var server = http.createServer(function(request, response) { response.writeHead(200, {'Content-Type': 'text/plain'}); response.write('Hello, Node!'); response.end(); }); server.listen(4000); console.log("Server is listening on port 4000");
server.js
and access URL in web browser
http://localhost:4000/