Node Export Module
In Node, the `module.exports` is utilized to expose literals, functions, or objects as modules. This mechanism enables the inclusion of JavaScript files within Node.js applications. The `module` serves as a reference to the current module, and `exports` is an object that is made accessible as the module’s public interface.
Syntax:
module.exports = literal | function | object
Note: Here the assigned value (literal | function | object) is directly exposed as a module and can be used directly.
Syntax:
module.exports.variable = literal | function | object
Note: The assigned value (literal | function | object) is indirectly exposed as a module and can be consumed using the variable.
Below are different ways to export modules:
Table of Content
- Exporting Literals
- Exporting Object:
- Exporting Function
- Exporting function as a class
Example 1: Exporting Literals
Create a file named as app.js and export the literal using module.exports
.
module.exports = "w3wiki";
Create a file named as index.js and import the file app.js to print the exported literal to the console.
const company = require("./app");
console.log(company);
Output:
w3wiki
Example 2: Exporting Object:
Create a file named as app.js and export the object using module.exports
.
module.exports = {
name: 'w3wiki',
website: 'https://w3wiki.net'
}
Create a file named as index.js and import the file app.js to print the exported object data to the console.
const company = require('./app');
console.log(company.name);
console.log(company.website);
Output:
w3wiki
https://w3wiki.net
Example 3: Exporting Function
Create a file named as app.js and export the function using module.exports
.
module.exports = function (a, b) {
console.log(a + b);
}
Create a file named as index.js and import the file app.js to use the exported function.
const sum = require('./app');
sum(2, 5);
Output:
7
Example 4: Exporting function as a class
Create a file named as app.js. Define a function using this keyword and export the function using module.exports and
Create a file named index.js and import the file app.js to use the exported function as a class.
Javascript
const Company = require( './app' ); const firstCompany = new Company(); firstCompany.info(); |
Javascript
module.exports = function () { this .name = 'w3wiki' ; this .website = 'https://w3wiki.net' ; this .info = () => { console.log(`Company name - ${ this .name}`); console.log(`Website - ${ this .website}`); } } |
Output:
Company name - w3wiki
Website - https://w3wiki.net
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