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Format wise, file type wise and practical use wise?
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JSONP is a method for sending JSON data without worrying about cross-domain issues. JSONP does not use the XMLHttpRequest object. JSONP uses the <script> tag instead.
dataType: jsonp for cross-domain request, that means request to different domain and dataType: json for same domain-same origin request. Loads in a JSON block using JSONP. Adds an extra "? callback=?" to the end of your URL to specify the callback.
JSONP has some other limitations, too: It can only be used for GET requests, and there's no general way to prevent cross-site request forgeries*. It's bad for private data, since any site on the web could hijack a JSONP response if the URL is known. This means it's best suited for consumption of public data feeds.
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 is JSON with padding. That is, you put a string at the beginning and a pair of parentheses around it. For example:
//JSON {"name":"stackoverflow","id":5} //JSONP func({"name":"stackoverflow","id":5}); The result is that you can load the JSON as a script file. If you previously set up a function called func, then that function will be called with one argument, which is the JSON data, when the script file is done loading. This is usually used to allow for cross-site AJAX with JSON data. If you know that example.com is serving JSON files that look like the JSONP example given above, then you can use code like this to retrieve it, even if you are not on the example.com domain:
function func(json){ alert(json.name); } var elm = document.createElement("script"); elm.setAttribute("type", "text/javascript"); elm.src = "http://example.com/jsonp"; document.body.appendChild(elm); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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