Where to place common functions in express.js?

Question

I am wondering where common functions should be placed in the express structure to be shared between different routes.

Is there any "best practice" for it? Nothing is mention in the documentation about it.

Answer 1

They should be placed in an include that you require from each route.

common.js

function Common(){}

Common.prototype.method1 = function(){}
Common.prototype.method2 = function(){}

module.exports = new Common();

route.js

var common = require('./common');
common.method1();
common.method2();