How can I share code between Node.js and the browser?

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If you want to write a module that can be used both client side and server side, I have a short blog post on a quick and easy method: Writing for Node.js and the browser, essentially the following (where this is the same as window):

(function(exports){

    // Your code goes here

   exports.test = function(){
        return 'hello world'
    };

})(typeof exports === 'undefined'? this['mymodule']={}: exports);

Alternatively there are some projects aiming to implement the Node.js API on the client side, such as Marak’s gemini.

You might also be interested in DNode, which lets you expose a JavaScript function so that it can be called from another machine using a simple JSON-based network protocol.

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