nodeJS: Sending html data from one js to another

Question

The code below is working

var express = require('express')
var app =  express();
var fs = require('fs')
var addUserToDB = require('./addUserToDB')

app.use('addUserToDB', addUserToDB)

app.get('/register.html', function(req,res){
    res.sendFile(__dirname+ "/" + "register.html");
})

var server = app.listen(8087,function(){

    console.log("Listening at 8087");
})


app.get('/addUserToDB',function(req,res){

    firstname = req.query.firstname;
    console.log(firstname)
})

app.get('/register.html', function(req,res){
    res.sendFile(__dirname+ "/" + "register.html");
})

However, when I try to remove the following method and place it into another .js file so I can get the firstName from that file. It's not working. The following code is in addUserToDB.js:

var addUserToDB = app.get('/addUserToDB',function(req,res){

        firstname = req.query.firstname;
        console.log(firstname)
    })
module.exports = addUserToDB;

I have tried making a addUserToDB.js file and added the code

var express = require('express')
var app = express();

app.get('addUserToDB',function(req,res){

    firstname = req.query.firstname;
    console.log(firstname)
})

but it seems I am missing something because it doesn't work. Thanks.

yes i have this: module.exports = addUserToDB; in my addUserToDB.js and also the following: var addUserToDB = require('./addUserToDB') app.use('addUserToDB', addUserToDB) in server.js — CoderSenju
– CoderSenju, Commented Feb 9, 2017 at 0:01

Luis Diego Hernández · Accepted Answer · 2017-02-09 16:44:50Z

2

A few things here. First, need to do a require of addUserToDB.js from server.js (I will assume that's the name of your main file) and then use it as a middleware. Also, you need to export the app from addUserToDB.js.

server.js:

var express = require('express')
var app =  express();
var fs = require('fs')
var addUserToDB = require('./addUserToDB');

app.get('/register.html', function(req,res){
    res.sendFile(__dirname+ "/" + "register.html");
})

var server = app.listen(8087,function(){

    console.log("Listening at 8087");
})

app.use(addUserToDB);

addUserToDB.js:

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

router.get('/addUserToDB',function(req,res){

    firstname = req.query.firstname;
    console.log(firstname)
})

module.exports = router;

edited Feb 9, 2017 at 16:44

answered Feb 9, 2017 at 0:09

Luis Diego Hernández

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6 Comments

CoderSenju Over a year ago

it's working thank you. I want to ask this: when you are doing module.exports = app; what, am i right in understanding that you are importing all usages of app in addUserToDB.js ?... and also, is there a way to export the entire file instead of a var or a function of a file?

Luis Diego Hernández Over a year ago

Yes, you can say it like that. You're exporting the definition of the functions in your file, which in this case is app plus the route for /addUserToDB. Alternatively, you can use var router = express.Router(); instead of var app = express(); (and router instead of app) and you will achieve the same effect, but using Express's router is better than using app because you only export the route and not the whole app.

Luis Diego Hernández Over a year ago

No, you can only export one variable. If you need to add more routes to addUserToDB.js you can call define more routes like router.get('/route') before exporting route (or app). Or in some cases, for controllers, you can just export an object with functions, like module.exports = { func1: function () { }, func2: function () {}};.

CoderSenju Over a year ago

so its like the entire code inside a .js file belongs to a module.exports? - @Luiz

Luis Diego Hernández Over a year ago

That would be the optimal way to do it. If you're separating your app into several modules or files, each module should do specifically one thing, so anything you do in a file and export should be related to the same thing.

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