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Please explain JSONP
What is JSONP, why is it needed, and what are some real world examples of it's usage.
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JSONP, or JSON-P (JSON with Padding), is a historical JavaScript technique for requesting data by loading a <script> element, which is an element intended to load ordinary JavaScript.
JSONP stands for JSON with Padding. Requesting a file from another domain can cause problems, due to cross-domain policy. Requesting an external script from another domain does not have this problem. JSONP uses this advantage, and request files using the script tag instead of the XMLHttpRequest object.
March 1, 2022. JSON with Padding, or JSONP for short, is a technique that allows developers to get around browsers' same-origin policies by exploiting the nature of the <script> element. The policy prohibits reading any responses made by websites with origins other than those currently in use.
JSONP is just a script include that allows you to use a callback. You should however be aware of Cross-site request forgery (CSRF). As long as you control the script and the server, JSONP isn't anymore insecure than a script include. Unless you have a JSONP-service that returns sensitive data to logged in users.
JSONP stands for JSON with padding, and it provides a way for the client to specify some code that should be added to the start of the JSON response. This allows the JSONP response to be directly executed in the browser. An example of a JSONP response might be:
processResults({value1: "Hello", value2: "World"})
I think the major place that JSONP would be useful is in making requests across domains using the <script> tag. I think the major disadvantage is that as the JSONP is directly executed you would have to trust that the remote site wouldn't send back anything malicious. However I have to admit that I haven't used the technique in practice.
Edit: Remote JSON - JSONP provides more information on why you would want to use the technique from the guy who appears to have invented it.
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http://remysharp.com/2007/10/08/what-is-jsonp/
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