JSONP or “JSON with padding” is a complement to the base JSON data format. It provides a method to request data from a server in a different domain, something prohibited by typical web browsers because of the same origin policy.

The response to a JSONP request (namely, a request following the JSONP usage pattern) is not JSON and is not parsed as JSON; the returned payload can be any arbitrary JavaScript expression, and it does not need to include any JSON at all. But conventionally, it is a JavaScript fragment that invokes a function call on some JSON-formatted data.

A must read source of jsonp is http://www.json-p.org/. It also have jsonp validator.

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