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It is impossible to fetch all of Stack Overflow's users in a single API call, or even in a single day (using just the API and one IP address). There are currently 1,995,355 users on Stack Overflow. Which means that you would need 19,954 API calls to get them all, but your maximum API quota is 10,000 calls per day. The smart thing to do is to have your app ...

The API only returns data in JSON format - you must perform any conversion yourself. Here is the source code for a PHP app I wrote a while back that converts the JSON returned by the API to XML: http://quickmediasolutions.com/pastebin/1/stack2xml-source-code It expects two GET variables to be set: method - the API route to use (for example, ...

JSON is faster and more compact, so it is easier on the server, and easier to parse in most application languages -- while still being human-readable. Since the API is returning data, rather than markup, JSON is a much better choice than XML. If you insist on XML, there are a great   many   ways   to convert the data yourself, without loading the API ...