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Uncaught SyntaxError: Unexpected token u with Ajax post

I am stumped as to how to solve/diagnose ajax/jquery error.
This is my function:
var LogIn = {
Email: $("#Name").val(),
MobileNo: $("#txtMobileNumber").val(),
PinCode: '',
Message: '',
Success:false
};
$.ajax({
type: "POST",
crossDomain: true,
dataType: 'jsonp',
contentType: "application/json",
url: "https://a different server domain/api/LoginRequest",
data: JSON.stringify(LogIn),
success: function (data) {
$("#divError").html(data);
},
error: function (error) {
jsonValue = jQuery.parseJSON(error.responseText);
$("#divError").html(jsonValue);
}
});
I get this error:

jQuery doesn't support using POST and jsonp and the reason for that is very simple: when you inject a <script> tag into the DOM (which is what jQuery does when you use jsonp), the browser will send a GET request to the remote endpoint which has been referred to in the src property of this tag.
So basically you will need to use GET instead:
type: "GET"
Also since the data is sent as query string parameters you should remove the content type:
contentType: "application/json",
and do not JSON.stringify the data.
And here's the full example:
$.ajax({
type: "GET",
crossDomain: true,
dataType: 'jsonp',
url: "https://a different server domain/api/LoginRequest",
data: LogIn,
success: function (data) {
$("#divError").html(data);
},
error: function (error) {
jsonValue = jQuery.parseJSON(error.responseText);
$("#divError").html(jsonValue);
}
});
Of course this will work only if the remote endpoint supports JSONP and the GET verb.
Personally I would recommend using CORS instead of JSONP as it would give you much more options. You will be able to use POST in this case. Please refer to the following material as it seems you are using ASP.NET Web API on the server and trying to make a cross domain AJAX call: http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api

Cannot do a post with jquery with json in body

With Chrome REST service I do this: a post to a certain url, I send a json string in the body, I set the content type as application/json and when I execute the post I get the proper answer.
I am trying to do the same post with jquery.
I first try with:
var beacon = {"beaconid.minor":2,"beaconid.UUID":"beaconnr","beaconid.major":1};
$.ajax({
type: "post",
data: JSON.stringify(beacon),
contentType: "application/json",
dataType: "jsonp",
crossDomain: true,
url: "myurl"}).done(function() {
alert("success");
}).fail(function()
{
alert("error");
});
by I seem to get no answer, I don't get the success alert nor the error alert.
I have then tried with:
var jqxhr = $.post( "myurl", {"beaconid.minor":2,"beaconid.UUID":"beaconnr","beaconid.major":1}).done(function(data, textStatus, jqXHR)
{
}).fail(function(jqXHR, textStatus, errorThrown)
{
alert(textStatus);
});
At least now I get an alert with the textStatus as an error. It is something...but not enough. I could I do a successful post?

The issue is you're setting dataType: "jsonp" for a POST request. JSONP doesn't support POST requests, only GET requests.
I suggest changing to dataType: "json" to see if the service supports CORS. If it doesn't then you'll have to do something like proxy the request through the local server, to get around CORS.

You should not be sending "post" as "type", rather as "method"
And like pointed above, the data type should be json and not jsonp.
$.ajax({
method: "post",
data: JSON.stringify(beacon),
contentType: "application/json",
dataType: "json",
url: "myurl"}).done(function(response) {
alert("success");
//if in chrome
//console.log(response);
}).fail(function(error)
{
//if using Chrome
//console.log(error);
alert(error);
});

AJAX is not sending request

I have the following code:
$("form").submit(function()
{
//Checking data here:
$("input").each(function(i, obj)
{
});
alert(JSON.stringify($(this).serializeArray()));
var url='http://127.0.0.1:1337/receive';
$.ajax({
url: url,
type: 'POST',
contentType:'application/json',
data: JSON.stringify($(this).serializeArray()),
dataType:'json'
});
});
And after I submit the form, I get a JavaScript alert with the json string, so that is made correct (on my server I only log it so it does not matter what it is in it). If I try to send a request to the same link from postman it works, it logs it.
I think I'm doing something wrong in the ajax call, but I am not able to figure out.

Try below piece of code. Add success and error handler for more details
$("form").submit(function()
{
//Checking data here:
$("input").each(function(i, obj)
{
});
alert(JSON.stringify($(this).serializeArray()));
var url='http://127.0.0.1:1337/receive';
$.ajax({
url: url,
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: JSON.stringify($(this).serializeArray()),
dataType:'json',
success : function(response) {
alert("success");
},
error: function (xhr, status, error) {
alert(error);
}
});
});

data:{ list : JSON.stringify($(this).serializeArray())}

From the Jquery docs:
Due to browser security restrictions, most "Ajax" requests are subject to the same origin policy; the request can not successfully retrieve data from a different domain, subdomain, or protocol.
crossDomain attribute simply force the request to be cross-domain. dataType is jsonp and there is a parameter added to the url.
$.ajax({
url:'http://127.0.0.1:1337/receive',
data:{ apikey: 'secret-key-or-any-other-parameter-in-json-format' },
dataType:'jsonp',
crossDomain: 'true',
success:function (data) {alert(data.first_name);}
});

Uncaught syntax error: Unexpected token < , ajax call

<script>
(function(){
var searchURL = 'http://en.wiktionary.org/wiki/search';
$.ajax({
type: "GET",
url: searchURL,
dataType: "jsonp",
cache: false,
async:false,
success: function(responseData, textStatus, XMLHttpRequest){
iframe(responseData);
}
});
})();
</script>
I added this script to my html file and it is show the following errors, copy pasting the function in console is also showing the same errors.
Uncaught SyntaxError: Unexpected token <
Resource interpreted as Script but transferred with MIME type text/html
could anyone help me resolve this issue, I am using Chrome brower.

You can't request arbitrary pages via AJAX, and jsonp doesn't magically make that work. You need to use the Wiktionary API.
The URL is http://en.wiktionary.org/w/api.php.
$.ajax({
url: 'http://en.wiktionary.org/w/api.php',
dataType: 'jsonp', // will automatically add "?callback=jqueryXXX"
cache: true, // the API complains about the extra parameter
data: { // the parameters to add to the request
format: 'json',
action: 'query',
titles: 'test'
},
success: function(data){
console.log(data);
}
});

Receive serialized in php data by using ajax

I have a php script, which return serialized in php data. And I try to receive this data by using $.ajax() method from jQuery 1.7. Here is the example.
$.ajax({
url: 'http://input.name/get.php?do=lookup' + '&domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
type: 'GET',
dataType: 'text',
cache: 'false',
complete: function(res) {
alert('COMPLETE() done');
console.log(res);
}
});
In console I see only
Object { readyState=0, status=0, statusText="error"}
So, what I do wrong? Could you help me please?
UPD
Interesting notice: if I use JSONP dataType request can receive data, but can't process it.
Here is an example.
$.ajax({
url: 'http://input.name/get.php?do=lookup',
data: 'domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
dataType: 'jsonp',
cache: false,
success: function(data) {
alert("Data: "+data);
},
error: function(jqXHR, textStatus, errorThrown) {
alert("Error: "+textStatus);
console.log(jqXHR);
}
});

Instead of complete: use success: then res will be the returned data from your ajax request.
Remember to use error: as well incase there is an error with you call, as it seems that there might be in your console output.
Code:
$.ajax({
url: 'http://input.name/get.php?do=lookup',
data: 'domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
cache: false,
success: function(data) {
alert("Data: "+data);
},
error: function(jqXHR, textStatus, errorThrown) {
alert("Error: "+textStatus);
console.log(jqXHR);
}
});

Your code is probably fine, but you're trying to violate the same origin policy. Basically, if your site is http://aaa.com/, you cannot make AJAX called to http://bbb.com/.
There are a few ways around it:
Getting around same origin policy in javascript without server side scripts
But most of them require that both sides play nice.

The response is the second parameter of complete function:
$.ajax({
url: 'http://input.name/get.php?do=lookup' + '&domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
type: 'GET',
dataType: 'text',
cache: 'false',
complete: function(res,response) {
alert('COMPLETE() done');
console.log(response);
}
});
More info: http://api.jquery.com/jQuery.ajax/
You should also consider using JSON, not php serialized data