module.exports

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module.exports is an empty object and a property on the module object. odule is a special object in NodeJS which contains information about the current module. The exports property is used to expose properties or functions of the current module. Use require to import properties from some module.

// file.js 
module.exports = “Hello world”;

// file2.js 
module.exports = {
   fn: function () { 
// ... 
} 
};

// app.js 
var message = require(‘./file’);
 console.log(message); // Hello world 

var file2 = require(‘./file2’); console.log(file2.fn());
 // call fn on the file2

With the introduction of ES Modules via ES6, an export and import keyword can be used for exporting and importing properties.

// file.js
 const message = “Hello world”;
 export default message;

// file2.js
 export function fn() { 
// ... 
}

// app.js
 import message from ‘./file’;
 console.log(message); // Hello world

 import { fn } from ‘./file2’;
 console.log(fn()); // call fn on the file2