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I understand that client side code must be readable from the browser but I wonder (since there are too many things that I ignore) if there are ways to obfuscate to code to the end user and, if not what is the best practice to "pack" the javascript code.
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JavaScript obfuscation is a series of code transformations that turn plain, easy-to-read JS code into a modified version that is extremely hard to understand and reverse-engineer. Unlike encryption, where you must supply a password used for decryption, there's no decryption key in JavaScript obfuscation.
No. Javascript is sent as text to the browser: if the browser can read it, so can the user - or it wouldn't work at all.
No. The actual structure of the page is represented in the DOM, which is rendered by the browser. Necessarily, anything that is displayed on the page appears in the DOM and the DOM can be written out to disk (as HTML). Certainly, you can obfuscate JavaScript to make it difficult to read, but you can't hide it outright.
Regarding client-side javascript code, which is what we usually see on the web, is unusable when put through an encryption scheme as the web browser needs to read the code so it can be interpreted by the browser. Usable javascript code is always trivial to view and get a copy of.
JavaScript code obfuscation is a series of code transformations that turn your exposed code into a protected version of the code that is extremely hard to understand and reverse-engineer.
It is good practice to minify your JS with a tool such as YUI Compressor. I would not obfuscate it unless you have a specific need to do this. There are plenty of online obfuscators such as this one
See this article: http://developer.yahoo.net/blog/archives/2007/07/high_performanc_8.html
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Check this out.
Other than min'ing it, I don't think you can really hide js. It all goes the user's browser and there are plenty of ways of seeing it once its there.
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