Can I access any API with JSONP or does the API need to specifically support it?

Question

I am trying to access an API from bar.com from my site foo.com. Bar.com does NOT allow CORS, and I don't know if they officially support JSONP.

Can I still access the API via JSONP (using jQuery) or does the site explicitly need to support it?

Note, this is my AJAX request:

 $.ajax({ url: 'https://api.example.com', jsonp: 'callback', dataType: 'jsonp', data: { 'command' : 'abc', 'partnerName' : 'def', 'partnerPassword' : 'ghi', 'partnerUserID' : 'jkl', 'partnerUserSecret' : 'mnop' }, error: function (response) { console.log(response); return false; }, success: function (response) { console.log(response); return false; } }); },

From Chrome I get:

Uncaught SyntaxError: Unexpected token :

The site needs to support it for it to work.

Michael Aaron Safyan
– Michael Aaron Safyan

2015-01-09 04:42:42 +00:00
Commented Jan 9, 2015 at 4:42 — Michael Aaron Safyan
– Michael Aaron Safyan, Commented Jan 9, 2015 at 4:42

andrusieczko · Accepted Answer · 2015-01-09 05:21:48Z

It's because what JSONP does is try to evaluate the code that comes from the API endpoint.

If the result of the call is, let's say

{"result": "OK"}

then, to make JSONP work, the server had to respond it in that way:

callback({"result": "OK"})

as oyu defined a property jsonp as callback in your ajax call.

Hmmm...I think the real issue is that the API doesn't support JSONP
@JustinCloud: yes, that's the point :) and my answer is an explanation why you need this support :)

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