Including JavaScript class definition from another file in Node js

Question

I m writing a simple server for Node js and I m using my own class called User which looks like   function User socket        this socket   socket      this nickname   null              just the typical source code like functions  variables and bugs             this write   function object            this socket write JSON stringify object               and then later in the process I m instantiating it a lot   var server   net createServer function  socket           other bugs        var user   new User socket          more bugs and bad practise          Can I move my User class definition to another javascript file and  include  it somehow

User · Answer

If you append this to user js   exports User   User    then in server js you can do   var userFile   require    user js    var User   userFile User    http   nodejs org docs v0 4 10 api globals html require  Another way is   global User   User    then this would be enough in server js   require    user js

User · Answer

Modify your class definition to read like this   exports User   function  socket               Then rename the file to user js  Assuming it s in the root directory of your main script  you can include it like this   var user   require    user    var someUser   new user User      That s the quick and dirty version  Read about CommonJS Modules if you d like to learn more

User · Answer

Another way in addition to the ones provided here for ES6  module exports   class TEST      constructor size            this map   new MAp            this size   size              get key            return this map get key              length             return this map size                 and include the same as   var TEST  require    TEST    var test   new TEST 1

User · Answer

Instead of myFile js write your files like myFile mjs  This extension comes with all the goodies of es6  but I mean I recommend you to you webpack and Babel

User · Answer

You can simply do this  user js class User                module exports   User  server js const User   require    user js       Instantiate User  let user   new User    This is called CommonJS module  Export multiple values Sometimes it could be useful to export more than one value  For example it could be classes  functions or constants  This is an alternative version of the same functionality  user js class User     exports User   User     Spot the difference  server js const  User    require    user js       Destructure on import     Instantiate User  let user   new User    ES Modules Since Node js version 14 it s possible to use ES Modules with CommonJS  Read more about it in the ESM documentation      Don t use globals  it creates potential conflicts with the future code

User · Answer

Using ES6  you can have user js   export default class User     constructor                     And then use it in server js  const User   require    user js   default  const user   new User

User · Answer

I just want to point out that most of the answers here don t work  I am new to NodeJS and IDK if throughout time the  module exports yourClass  method changed  or if people just entered the wrong answer       MyClass  module exports Ninja   class Ninja      test            console log  TESTING 1    2    3                    Using MyClass in seprate File   const ninjaFw   require    NinjaFw     let ninja   new ninjaFw Ninja    ninja test        This is the method I am currently using  I like this syntax  becuase module exports sits on the same line as the class declaration and that cleans the code up a little imo  The other way you can do it is like this        Ninja Framework File   class Ninja      test            console log  TESTING 1    2    3                  module exports Ninja   Ninja      Two different syntax but  in the end  the same result  Just a matter of syntax anesthetics

[javascript] Including JavaScript class definition from another file in Node.js

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