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Ajax Post request returns internal error 500?

I am making a project for local use using jQuery and Node.js + Express API.
When I "place an order" using Postman there is no problem:
When I do, what seems to me, the same with jQuery, I get an internal server error 500:
$.ajax({
type: "post",
url: "http://localhost:3001/roomorder",
data: {
roomOrderLines: global_orderSummary,
},
dataType: "json",
success: (placeOrderResult) => {
$('#appContent').html(`success!`);
},
error: (xhr, ajaxOptions, thrownError) => {
global_setError("An error occurred. / "+xhr.status+" / "+thrownError);
}
});
the global_orderSummary looks like this when I console.log it, looks identical to me as what I use as data in Postman:
Any help would be much appreciated!

I had to make these adjustments, now it works:
type: "post",
url: "http://localhost:3001/roomorder",
data: JSON.stringify ({roomOrderLines: global_orderSummary}),
dataType: "json",
contentType: "application/json",

Show Ajax error response as a webpage

from an Ajax call that was build up like this:
function GetData() {
$.ajax({
type: "POST",
url: "#Model.RouteForAjaxLastValue",//"/RCharts/AjaxMethod",//
data: "{Id: " + lastID+ "}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
},
failure: function (response) {
alert(response.responseText);
},
error: function (response) {
alert(response.responseText);
}
})
I sometimes get responses like this:
I can see that this is meant to be displayed as a webpage since its an entire page html formatted.
But is there a way to display that directly as a new page mabye?
It cuts of the rest of the message in the alert before I can even get to read what the error may be...

Use $("html").html(response.responseText); inside your success function .
success : function(response){
$("html").html(response.responseText);
}

You should probably use console.log()
but this should append it to the body:
$('body').append(response.responseText);

Jquery $.ajax not posting a string of data in ASP.NET MVC

I have a situation where I am building the json data to post dynamically. so I create it in a for loop and then attempt to use the $.ajax command, but on the server side the model is null. If I hard code the data section as would be normal, it works fine. I tried the same process with a simple model just to check and the same happens.
So this works:
$.ajax({
url: '#Url.Action("SetupQuestions", "Login")',
type: 'POST',
dataType: 'json',
cache: false,
data: {SharedSecret: 'Bob'},
success: function (data, status, xhr) {
$('#divMFAQuestion').html(data).fadeIn('slow');
},
error: function (xhr, status, error) {
alert("MFA Challenge Error (b): " + error);
}
});
But this doesn't:
var datastring = '{SharedSecret: Bob}';
$.ajax({
url: '#Url.Action("SetupQuestions", "Login")',
type: 'POST',
dataType: 'json',
cache: false,
processData: false,
data: JSON.stringify(datastring),
success: function (data, status, xhr) {
$('#divMFAQuestion').html(data).fadeIn('slow');
},
error: function (xhr, status, error) {
alert("MFA Challenge Error (b): " + error);
}
});
Nor this:
var datastring = 'SharedSecret: Bob';
Any thoughts?

You have quotes around your entire JSON data structure:
var datastring = '{SharedSecret: Bob}';
JSON.stringify expects a JSON structure, so the quotes should only be around the string part for JSON.stringify to work:
var datastring = {SharedSecret: 'Bob'};
However, the reason that your AJAX call is not working is that the data parameter accepts a JSON data structure. JSON.stringify will serialize it as a string, which data does not expect. So you need to just pass the fixed datastring without JSON.stringify.
data: datastring

Ajax response not showing in JS

I have an AJAX script like this
function savetoDB(inp) {
var userID = (FB.getAuthResponse() || {}).userID;
jQuery.ajax({
url: URL,
type: 'GET',
data:{ 'input': JSON.stringify(inp) },
contentType: 'application/json; charset=utf-8',
dataType: 'json',
async: true,
success: function(msg) {
console.log(msg);
alert(msg);
}
});
}
The problem I am facing is that the php returns (echo's) some string , but I am unable to see it in alert.
I used the inspect element and Inside inspect element I can see the Response, and also the status is 200, what could be the reason that it is not showing the response in alert?

You are returning a JSON object, so it won't show in alert, which only displays strings. Convert it to a string first:
success: function(msg) {
console.log(msg);
alert(JSON.stringify(msg));
}

Replace "URL" with the actual url of file you're extracting data from otherwise you'll get an empty response as is the case.

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);
}
});