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copied!<p>Before it was acquired by Google, <a href="http://www.jot.com/" rel="nofollow noreferrer">JotSpot</a> used server-side JavaScript to let you query their database and display your pages. They used <a href="http://www.mozilla.org/rhino" rel="nofollow noreferrer">Rhino</a> to do it. CouchDB uses server-side JavaScript to create <a href="http://wiki.apache.org/couchdb/Views" rel="nofollow noreferrer">views</a> of their database.</p> <p>As you can see from these examples, a great way to use JavaScript on the server is for plugins. One of the reasons it's used is that you can create a very isolated sandbox for people to run their code in. Also, because of the way that JavaScript as a language works, you can provide a user tooling specifically honed to the tasks your users need to complete. If you do this right, users don't need to learn a new language to complete their tasks, a quick glance at your API and examples is enough to get them on their way. Compare this to many of the other languages and you can see why using server-side JavaScript to provide a plugin architecture is so enticing.</p> <p>A secondary popular solution, one which can be seen through a project like <a href="http://www.aptana.com/jaxer" rel="nofollow noreferrer">Jaxer</a>, is that a common problem of web applications that do client-side validation is that, since JavaScript is easily bypassed in the browser, validation has to be run once again on the server. A system like Jaxer allows you to write some validation functionality that is reusable between both server and client.</p>

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