Export a function in NodeJS module

Question

I have a module in NodeJS which has the following definition:

var express = require('express');
var router = express.Router();

function myFunction(){
    //do some stuff
};

router.get('/url', function(req, res, callback) {   
    var data = myFunction();
    res.render('index', {
        item: data
    });
});

module.exports = router;

I want it to be called in both ways:

HTTP petition:

http://localhost:3090/url

As a function in another module:

var myModule = require('myModule');
var data = myModule.myFunction();

I can access the module by HTTP in the way shown above. However, I don't know how to export myFunction to be used in another module. I have tried the following without any success:

router.myFunction = myFunction;
module.exports = router;

And:

module.exports = router;
module.exports.myFunction = myFunction;

How could I solve this problemn? Thank you very much in advance

how about module.exports.router = router; module.exports.myFunction = myFunction; ? sounds more like you'd want to split the two in two seperate modules though — Laura
– Laura, Commented Dec 3, 2014 at 16:27

A.B · Accepted Answer · 2014-12-03 16:58:52Z

5

you can make these changes

use exports to expose multiple functions

exports.router = router; 
exports.myFunction = myFunction;

for including them both in other file(path to myModule can vary as per your structure) you can now include them as

var routes= require('./myModule').router;
var myfunction = require('./myModule').myFunction;

edited Dec 3, 2014 at 16:58

answered Dec 3, 2014 at 16:29

A.B

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2 Comments

Rajit Over a year ago

function myFunction() will work just fine. Explicit assignment isn't necessary.

A.B Over a year ago

My pleasure, great to hear it helped you

Zlatko · Accepted Answer · 2014-12-03 19:27:19Z

1

Another way is to also sum up everything you're exporting at the end of the module - basically construct the exports object:

module.exports = {

    myFunction: myFunction,
    router: router,
    someConstant: 42,
    anotherValue: calculateThisValue()
}

At any time, module.exports is a global per-file object you get when you require that file. If you put nothing there, it'll be undefined. If you make it a function, then it'll be a function. If you make an object literal like above, you get an object. You can also export primitives, like dates, arrays, or whatever else you may think of.

answered Dec 3, 2014 at 19:27

Zlatko

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