Probably because it is not intended to be read by humans. JSON parsers will have no problem with lack of irrelevant white space, so why bother adding white space?
Yes, I fully appreciate that it doesn't matter for parsers. But, still, when I have to write some JSON or some HTML, I usually prefer to insert at least some vertical space (EOLs), because there is almost always a time somewhere in the future when I or another human will need to read the source or change it. My take on this is similar to what I do with Perl or C code: to make it friendly to the human reader. But I certainly understand your point that you may also need to optimize your document's size, especially if it's going to be transmitted zillions of times over a network which may sometimes be slow.

In reply to Re^3: parse html for specific things by Laurent_R
in thread parse html for specific things by Gtforce

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