include external js file in node js app

Question

I have an app js node application  As this file is starting to grow  I would like to move some part of the code in some other files that I would  require  or  include  in the app js file   I m trying things like      Declare application var app   require  express   createServer        Declare usefull stuff for DB purposes var mongoose   require  mongoose    var Schema   mongoose Schema  var ObjectId   Schema ObjectId      THE FOLLOWING REQUIRE DOES NOT WORK require    models car js      in car js      Define Car model CarSchema   new Schema     brand          String    type   String     mongoose model  Car   CarSchema     I got the error   ReferenceError  Schema is not defined   I m just looking to have the content of car js loaded  instead of having everything in the same app js file  Is there a particuliar way to do this in node js

User · Answer

This approach works for me in Node js  Is there any problem with this one   File  include js    fs   require  fs      File  main js    require    include js     fs readFile    file json   function  err  data        if  err            console log  ERROR  file json not found            else           contents   JSON parse data

User · Answer

To place an emphasis on what everyone else has been saying var foo in top level does not create a global variable  If you want a global variable then write global foo  but we all know globals are evil   If you are someone who uses globals like that in a node js project I was on I would refactor them away for as there are just so few use cases for this  There are a few exceptions but this isn t one       Declare application var app   require  express   createServer        Declare usefull stuff for DB purposes var mongoose   require  mongoose    var Schema   mongoose Schema  var ObjectId   Schema ObjectId   require    models car js   make Schema  mongoose     in car js  function make Schema  mongoose           Define Car model     CarSchema   new Schema         brand          String        type   String             mongoose model  Car   CarSchema      module exports make   make

User · Answer

you can put  var mongoose   require  mongoose    var Schema   mongoose Schema    at the top of your car js file for it to work  or you can do what Raynos said to do

User · Answer

If you just want to test a library from the command line  you could do   cat somelibrary js mytestfile js   node

User · Answer

Short answer      lib js module exports your function   function           Something           app js require    lib js   your function

User · Answer

The correct answer is usually to use require  but in a few cases it s not possible   The following code will do the trick  but use it with care   var fs   require  fs    var vm   require  vm    var includeInThisContext   function path        var code   fs readFileSync path       vm runInThisContext code  path     bind this   includeInThisContext   dirname   models car js

[javascript] include external .js file in node.js app

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