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The web site blog.sailsjs.com states the following, "See, thats what the app is perfect for." I saw that the website stated " Wahhhh, I dont wanna." They also said " Assuming there was no fatal error, should the first argument to an asynchronous callback be undefined or null? Assuming there was no fatal error, should the first argument to an asynchronous callback be undefined or null? Best practices for passing the first argument to an asynchronous callback. This is the short and sweet version. If you find it helpful, you might want to check out the entire gist. 1 Invoke callback with only." The meta header had node.js as the first optimized keyword. This keyword is followed by security, sailsjs, and sails.js which isn't as important as node.js. The other words blog.sailsjs.com used was callbacks.