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Uncaught SyntaxError: Unexpected token : - data still coming through

I'm very new to JSON and JSONP.
I've read through each of the posts that are recommend by the SO search for this error, but I can't seem to get a handle on it.
I have the following code to grab data from an EXTERNAL website:
$.ajax({
url: "https://url.com/authenticate?login=test&apiKey=test",
dataType: 'jsonp',
success:function(json){
console.log("login successful");
}
});
When I load the page, I get:
Uncaught SyntaxError: Unexpected token :
and when I click on the error in Chrome, I see
{"Status":{"Code":"2","Message":"Authentication Succeeded","Success":"true"}}
with a little red x after "true"})
From this, it seems as though I have succeeded in logging in, but I'm doing something else wrong because my console.log("login successful"); never fires. What am I doing wrong?
P.S.
I've tried dataType: 'json' but I get the No 'Access-Control-Allow-Origin' header is present as I'm on a different server, so I went back to jsonP as this is cross-domain.
I've also tried the above url as url: "https://url.com/authenticate?login=test&apiKey=test&callback=?", as I've read I need a callback, but I don't really understand what the functionality of callback is and either way, the error that gets returned (whether &callback=? is in there or not) is:
authenticateUser?login=test&apiKey=test&callback=jQuery111107732549801003188_1423867185396…:1 Uncaught SyntaxError: Unexpected token :
so it's adding the callback in either way....
Also, from the API I'm trying to access:
"this uses the REST protocol, and provides data structured as XML or JSON"
This is not a duplicate of the linked post as the information in the linked post does a great job of explaining what JSONP is, but doesn't answer my specific question regarding why I get data back (so my call is successful,) but why I still get an error and cause my script to stop.

The API you're sending the AJAX request doesn't implement JSONP. It ignores the callback= parameter, and just returns ordinary JSON. But when the browser tries to process this as JSONP, it gets a syntax error because it's not properly formatted. JSONP is a JSON object wrapped in a call to the specified callback function, e.g. it should be sending back:
jQuery111107732549801003188_1423867185396({...});
where {...} is the JSON object you're trying to retrieve. But it's just returning {...}.
You should implement this using a PHP script on your own server. It can be as simple as this:
<?php
$username = urlencode($_POST['user']);
readfile("https://url.com/authenticate?login=$username&apiKey=test");
Then your AJAX call would be:
$.ajax({
url: "yourscript.php",
type: "post",
dataType: "json",
data: { user: "test" },
success: function(json) {
console.log("login successful");
}
});

How to get PHP page returned by a jQuery Ajax request

So I have to send some data to a php page, and it will return me another php page based on my data.
I send the data this way:
$(document).ready(function() {
$.ajax({
url: '//www.example.com/page.php',
type: "post",
dataType: 'jsonp',
data: { myvar:myvalue },
success: function(response) { console.log("success."); },
error: function(XMLHttpRequest, textStatus, errorThrown) { console.log("error."); },
complete: function() { console.log("complete."); }
});
});
It shows an alert saying jQuery180014405992737595236_1357861668479 was not called (numbers are copied from other question)
I think the reason is that it's expecting a json result from the page, when it's not.
In Chrome it says Uncaught SyntaxError: Unexpected token < referring to the returned php page, so I assume that my code isnt expecting that kind of file to be returned.
To sum up, this works, but that jQuery alert and the console error needs to be fixed, and I think the right way would be handling properly the returned result page.
I hope you guys can help me fix it that seems quite a simple task, but Im really new to this. Thanks
Removing the dataType: 'jsonp' or changing it to 'json' turns out on my script not being executed and getting the following error:
XMLHttpRequest cannot load http://www.example.com/page.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://myserver.com/myPage' is therefore not allowed access.

I think the reason is that it's expecting a json result from the page
It's expecting a JSONP response. (JSONP is not JSON). You said:
dataType: 'jsonp',
… which explicitly forces jQuery to treat the response as JSONP (and, as a side effect, GET).
the returned php page, so I assume that my code isnt expecting that kind of file to be returned.
The server shouldn't be returning a PHP page. It should be executing the PHP code and returning whatever that outputs. It looks like it is outputting HTML.
You need to either:
Not tell your script to expect JSONP. (Note that you'll probably then have to configure CORS on the server to deal with same origin issues) or
Change the PHP to return JSONP

JSONP Syntax Error

I'm writing a jQuery interface to use a couple of OData services created in SAP. The services is working ok, and are also being used by some other applications.
I've already searched and I'm mostly come across people who are saying it's a cross domain issue. The first thing I tried was to plain and simply do a cross domain ajax call:
$.ajax({
url : 'http://saphostname:8000/sap/opu/odata/sap/entityset/?$format=json',
crossDomain : true,
xhrFields {
withCredentials : true,
}
// .. success, statusCodes, whatever ..
})
The responses that came from this call were 200, and if I viewed the content in the developer tools I saw my json message as I would expect it to be in there, but none of my callback functions were being triggered.
Upon searching more, somebody suggested using $.getJSON(). This didn't work either. The error that kept coming back was 401, so I assumed it was a cross domain issue.
The last thing I stumbled upon was JSONP. The response is coming back with an OK status code, and once again if I view the body content I see my json string as I would expect it. The only problem is my browser says there is a syntax error in the response text.
All of my search results have brought up issues regarding cross domain requests, and errors resulting there-in. Maybe it is the issue, but because I'm getting the results back that I would expect in the responses, I'd have to assume that connectivity is no problem.
tl;dr: ajax cross-domain requests are successful but don't trigger callback functions and jsonp gives me a syntax error. I'm not sure where to keep looking.

You are trying to do a JSONP request to a JSON service. The way that the response is handled for a JSONP request is that it is executed, but executing a JSON response only evaluates it and discards it.
The crossDomain property only causes the request to act like a cross domain request, i.e. using JSONP, regardless if it's actually to a different domain or not.
You should specify dataType: 'json' in the properties, to keep it from using JSONP.
Alternatively, if the service also supports JSONP, you could change $format=json in the URL to $format=jsonp, and specify dataType: 'jsonp' in the properties.
Edit:
Another thing that you can try is to use a proxy that turns a JSONP request to a JSON request. I have set up such a proxy that you can use to test if you can get the right response:
$.get(
"http://jsonp.guffa.com/Proxy.ashx?url=" + escapeURIComponent("saphostname:8000/sap/opu/odata/sap/entityset/?$format=json"),
function(data) {
console.log(data);
},
"jsonp"
);

I already had a problem like this before and what helped me to solve the problem was using callbacks like these:
// Assign handlers immediately after making the request,
// and remember the jqXHR object for this request
var jqxhr = $.ajax( "example.php" )
.done(function() {
alert( "success" );
})
.fail(function() {
alert( "error" );
})
.always(function() {
alert( "complete" );
});
// Perform other work here ...
// Set another completion function for the request above
jqxhr.always(function() {
alert( "second complete" );
});
Now you can see which one is being triggered and debug the problem.

Error in making cross domain request using jquery for json content

I am trying to call a service which returns the data in json format. I am using jquery-ajax request to get that response data.
$('#butCallAjax').click(function () {
$.ajax({
url: 'my service url',
type: 'GET',
data: {},
success: function (data) {
if (data == "success") {
alert('request sent!');
}
},
error: function () {
alert('error');
}
});
});
using this code I am getting error
Origin 'servername' is not allowed by Access-Control-Allow-Origin.
Then I found some answers here and solved that by using dataType:'jsonp' in the request But when I use this dataType:'jsonp' then I am getting this error
Uncaught Syntax Error: Unexpected token :
I understand that this is because of Service is returning 'json' instead of jsonp.
So I am not able to figured it out that how to call a service that returns the json content and taking care of cross domain request.
Js Fiddle Try

That doesnt answer your question directly but its also a way to achieve what you're trying:
You can use:
/* java side: */
$.getJSON("URL?some_call_back_function=?", dataToPass, function(data){
// do whatever you like..
});
/* php side: */
if(isset($_GET['some_call_back_function']) && $_GET['some_call_back_function'] != ''){
$someJsonToReturn = array('Something'=> "something");
echo $_GET['some_call_back_function'].'('.json_encode($someJsonToReturn ).')';
}
i hope that helps. i use that usually when i want cross domain.
here is the jquery API for it:
getJson API

You are trying to make a cross domain call which fails.
I have modified your jsFiddle and added
async: false,
cache:false
Plus added errorObject parameter to the "Error" in ajax.
you can see my changes here
The answer I got now was "network error dom exception 19".
DOM Exception 19 refers to a "Network Error".
Is the URL that you are contacting in your Ajax call available?
Cross domain requests are possible if the server supports it! Before making the actual GET/POST call, the browser issues an OPTIONS call to the server to check whether it supports cross domain requests. Check if the server that you are contacting supports cross domain requests.
For more details on cross domain requests refer to this article which is very helpful:
using CORS

GET ajax request

I'm sending GET request (which returns JSON).
The code looks like:
$.ajax({
url: "http://www.new.marketprice.ru/retrieveRegions.html",
dataType: "jsonp",
data: {
searchStr: request.term
},
error: function() {
console.log('epic fail');
},
success: function( data ) {
console.log(data);
}
});
It returns (into console);
Resource interpreted as Other but transferred with MIME type undefined.
epic fail
But in Network tab I see GET request with returned data:
[
{ "region":"Московская область","countryId":1,
"cityId":23,"regionId":12345,"city":"Москва","country":"Россия"},
{"region":"Ленинградская область","countryId":1,"cityId":453,
"regionId":54321,"city":"Санкт Петербург","country":"Россия"}
]
Why does error callback is called?
UPD
Okay, I set json and now no warning but error:
XMLHttpRequest cannot load http://www.new.marketprice.ru/retrieveRegions.html?searchStr=test. Origin http://new.marketprice.ru is not allowed by Access-Control-Allow-Origin
It's so strange because running script is located at same domain :(

It is only a json response not JSONP. Generally for JSONP the request will have callback method and response will be wrapped in that function name

Your headers don't specify the correct mime-type (application/json-p) and jQuery(?) is confused because it's not sure if it should process it as json or not.
See if you can get your server to respond with the correct type. The appropriate header is called Content-Type.
EDIT: whoops, and the OP is right, its not even JSON-P. Try changing what jquery is expecing to just 'json' first.

i was also in problem like this just try by using one more argument callback=? or json=jsonp