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All over the net I see examples of using jQuery to make AJAX POSTs of JSON encoded data to a server. What is the point of encoding the data in JSONfirst? Why not just send it as the default data type application/x-www-url-form-encoded which would save having to parse JSON data on the server?
Couple of reasons. One, it’s very easy to turn a JavaScript object into JSON, while it takes effort to encode it as x-www-url-form-encoded. Also, x-www-url-form-encoded isn’t really used that much any more. Besides the couple of input types that require a form, most things use AJAX nowadays. Also, JSON is much easier to debug because it’s legible.