JAVASCRIPT

how to export a function in nodejs

function foo(x, y) {
  return x + y;
}

function bar(x, y) {
  return x - y;
}

//You can also export numbers, classes, objects, etc
const foobar = 33;

module.exports = { foo, bar, num };

how to export module in node js

module.exports ={
 //functions
}

module export in node js

var users = [
    { userName: "BarneyRubble", age: 38   },
    { userName: "WilmaFlintstone", age: 37 },
    { userName: "FredFlintstone", age: 36 }
];

module.exports.getAllUsers = function(){
    return users;
}

export function node js

module.exports.yourFunctionName = function()
{

}

module.exports in js

module.exports = {
    method: function() {},
    otherMethod: function() {},
};


const myModule = require('./myModule.js');
const method = myModule.method;
const otherMethod = myModule.otherMethod;
// OR:
const {method, otherMethod} = require('./myModule.js');

What do "module.exports" and "exports.methods" mean in NodeJS / Express

// foo.js
module.exports = 42;

// main.js
console.log(require("foo") === 42); // true

modules.exports javascript

//2 ways of module.exports
// 1
function celsiusToFahrenheit(celsius) {
  return celsius * (9/5) + 32;
}
 
module.exports.celsiusToFahrenheit = celsiusToFahrenheit;
 
//2
module.exports.fahrenheitToCelsius = function(fahrenheit) {
  return (fahrenheit - 32) * (5/9);
};

exports in node js

require function returns exports of the require module.
module.exports is the returned object.
1)use module.exports to export single varibale e.g one class or one function 
e.g module.exports= Calculator.
2)use exports to export multiple named variables 
export.add = (a,b)=> a+b;
export.multiple=(a,b)=> a*b;

module.exports with JavaScript

mycoolmodule/index.js
module.exports = "123";


routes/index.js


var mymodule = require('mycoolmodule')

var router = express.Router();

/* GET home page. */
router.get('/', function(req, res, next) {
	console.log(mymodule);
});
 
/*will show 123 in the terminal*/
module.exports = router;

js exports

// First Export from other file
export default exampleFunction;
// for multiple exports use:
module.exports =  { exampleFunction1, exampleFunction2 };

// Then we import in the file where we want to use our functions
import exampleFunction from "./otherFile.js";
// for multiple imports, we desctructure
import { exampleFunction1, exampleFunction2 } from "./otherFile.js"

// Check MDN for more info on JS exports.
// NOTE: if running on node, add "type": "module" to your package.json file
//

What do "module.exports" and "exports.methods" mean in NodeJS / Express

// foo.js
var exports = {}; // creates a new local variable called exports, and conflicts with

// living on module.exports
exports = {}; // does the same as above
module.exports = {}; // just works because its the "correct" exports

// bar.js
exports.foo = 42; // this does not create a new exports variable so it just works

What do "module.exports" and "exports.methods" mean in NodeJS / Express

// foo.js
console.log(this === module); // true