Error in module export with Node.js

Question

I have an issue with exporting a module in Node.js. Here is a part of my code:

var zmq = require('zmq');
var module = require('module');

var DeviceRequester = function(port, name)
{
   ...   
};

var SMValueGetter = function(socket)
{
   ...
};

module.exports.DeviceRequester = DeviceRequester;
module.exports.SMValueGetter = SMValueGetter;

When I use it I get the following error:

module.exports.DeviceRequester = DeviceRequester;
                           ^
TypeError: Cannot set property 'DeviceRequester' of undefined
at Object.<anonymous> (<PROJECT_PATH>/node_modules/lse/lib/lse.js:168:32)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (<PROJECT_PATH>/server.js:6:13)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)

I have no idea why it occurs. I've red the Node.js documentation and some tutorials about exporting modules and all of them do it that way. Am I overlooking something?

tried another name just as 'mymodule' ? i think you are overwriting the default module .. — Gntem
– Gntem, Commented Oct 24, 2013 at 10:06
When I rename var module = = require('module'); and use mymodule.exports.DeviceRequester = DeviceRequester; mymodule.exports.SMValueGetter = SMValueGetter;,I still get the same error. When I use just exports.DeviceRequester = DeviceRequester without module/mymodule it works. — David Bulczak
– David Bulczak, Commented Oct 24, 2013 at 10:17
why are you using mymodule.exports.. ? the common way of exporting variables is module.exports and not yourmodule.exports.. — Gntem
– Gntem, Commented Oct 24, 2013 at 10:19
What you should do is var your module = require('module'), not what you assign to. — Michael Krelin - hacker
– Michael Krelin - hacker, Commented Oct 24, 2013 at 10:21

Gntem · Accepted Answer · 2013-10-24 10:14:11Z

3

Give more attentions at errors

TypeError: Cannot set property 'DeviceRequester' of undefined

at line var module=require("module"); you are overwriting the default module variable.

simple try to change at something that makes more sense, such as

var MyModule=require(..path..)

answered Oct 24, 2013 at 10:14

Gntem

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3 Comments

Gntem Over a year ago

that's because you haven't fully understand what module variable is .. exports.VAR is a short way of exporting variable that use module.exports

Michael Krelin - hacker Over a year ago

@DavidBulczak, you renamed the wrong part (according to the "above").

David Bulczak Over a year ago

I think that I understand the Node.js module system a little bit more :) Thank you guys!

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