Question

How to create, include and use your own module in Node.js

Answer 1

// The module: datetime.js

exports.getDateTime = function () {
    return Date();
};

// The application: test.js

const http = require('http');
const dt = require('./datetime');

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/html'});
  res.write(dt.getDateTime());
  res.end();
}).listen(8080); 



// To run open http://localhost:8080/ in your web browser

/*
run:

Thu Feb 27 2020 17:11:54 GMT+0200 (GMT+02:00)

*/

 

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Answer 2

// The module: log.js

function log(s) {
    console.log(s);
}

module.exports = log;

// The application: app.js

const logm = require('./log')

logm('Node.js');

   
   
  
   
/*
run:
   
Node.js
   
*/

 

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Answer 3

// The module: worker.js

const worker = {
    name: 'Tom',
    age: 51
}

module.exports = worker;

// The application: index.js

const worker = require('./worker');

console.log(worker);
console.log(worker.name);
console.log(worker.age);


     
/*
run:
   
{ name: 'Tom', age: 51 }
Tom
51
 
*/

 

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Answer 4

// The module: worker.js

class Worker {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }
    show() {
        console.log(`name = ${this.name} age = ${this.age}`);
    }
}


module.exports = Worker;

 

// The application: index.js

const Worker = require('./worker');

const w = new Worker('Ivy', 37);


console.log(w);
w.show();
console.log(w.name);
console.log(w.age);


     
/*
run:
   
Worker { name: 'Ivy', age: 37 }
name = Ivy age = 37
Ivy
37

 
*/

 

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