Require express in one file and use express.static in another

Question

How would I use express in one file, in other files that need to use the express package also. Currently I have a file server.js, that has the

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

I want to use express in my other files that are in different directories, how would I do this without doing a require?

Updated question

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How would I pass 'var express = require('express');' to another file so that I can use express.static?

Answer 1

If you don't want to use require you can pass app like this:

app.js

var express = require('express');
var app = express();
var something = require('./something')(app);

something.js

module.exports = function (app) {
  // do something with app
};

Answer 2

You can use module.exports to assign app variable , which can be used imported/required my other file . Sample example like below

a.js

var express = require('express');
var app = express();
module.exports.app = app;

b.js

var a = require('./a');
a.app.listen(3000,function(){
 console.log("Server Is up and running");
});

Answer 3

In nodeJs different files that we have in our application are treated as different module, so when we want to use them we export them and use them, here express is a package we are using so you can define it one file and export that file and require it in another file. use module.exports and require it another file.