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Unable to load JSON (Javascript)

I'm trying to load a JSON file by link and then align data (like title, date etc) to variables so I can use them. Right now, I don't care about variables. I just want to alert() them but something seems like I'm doing it wrong, alert returns nothing!
I use JSfidle to run the code. The code is this:
var JSON_unparsed = $.getJSON('http://www.14deftera.gr/feeds/posts/default?orderby=published&alt=json') ;
var JSON = JSON.parse(JSON_unparsed) ;
alert(JSON.feed.entry[0].title.$t) ;
The URL I want to parse is: http://www.14deftera.gr/feeds/posts/default?orderby=published&alt=json
and here you can see the JSON how is structured if that can help you:

You can use JSONP for this:
Update, for better understanding how to work with returned JSON.
var id, title;
$.ajax({
url: 'http://www.14deftera.gr/feeds/posts/default?orderby=published&alt=json',
jsonp: "callback",
dataType: "jsonp"
}).done(function(r){
// r is returned JSON
for(var i in r)
// for ex ID is this
id = r[i].id.$t;
// and title
title = r[i].title.$t;
// and so on, check the json, I mean check the browser console by hitting F12, below code will print the whole JSON
console.log(r[i]);
});
Codepen link: http://codepen.io/m-dehghani/pen/grXrrp?editors=0010

In addition to adeneo's reply, in your code, JSON_unparsed variable is holding something called (differed or promise object), this object might be holding the data inside it,but you are using the wrong way to pull it out. in order for you to get it out, you need to call (.done()) function, see the below:
var JSON_unparsed = $.getJSON('http://www.14deftera.gr/feeds/posts/default?orderby=published&alt=json').done(function(json){
console.log(json);
console.log(json.feed.entry[0].title.$t);
});
aside from that, if you got an error with something like this:
XMLHttpRequest cannot load http://www.14deftera.gr/feeds/posts/default?orderby=published&alt=json&_=1459788714707. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://stackoverflow.com' is therefore not allowed access.
it means that you are not allowed to call this API/URL from your current domain.
One more thing, if you are using getJSON method, there is no need to parse the returned data, jquery will parse it for you

connecting javascript to a Web API

I am new to the web development world and I would like to be able to connect an HTML page to a web api through . and I was really not successful in this.
I followed this tutorial to be able to make this connection : http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/tutorial-your-first-web-api
All I need is to send some inputs from an HTML page to a web api that takes these parameters and returns an object
I am using this code
$.getJSON("api/GeneratorController/setparameters/"+firstparameter+"/"+secondparameter+"/"+thirdparameter+"/"+fourthparameter+"/"+fifthparameter+"/"+sixthparameter,
function (data) {
alert(data); //never comes here
}).fail(function (jqXHR, textStatus, err) {
alert("All checks are correct, image was not generated. jqXHR = " + jqXHR.valueOf() + " textStatus=" + textStatus + " Error" + err);
});
it always goes into the fail portion , I attached the alert message that comes out of it
Any Reason why it is doing this ?
#smartmeta (I changed the typo , thanks) I followed your advice and here is the output of the alert (as expected , values that I have inserted are displayed):

Your url needs to start with your domain, not 'api/generatorcontroller/...'. If you are developing locally, something like http://localhost:[port]/api/generatorController/....
Also, webApi maps to url verbs, (get, post, put, delete..), not functions like setparameters, unless you have a [name=setparameters] above your get() function.
Also, I am pretty sure you don't have a route setup to handle the url with all those parameters. What you want to look at, as it seems your using jQuery, is jQuery.get documentation. The second example near the bottom shows where to place parameters. WebAPI will check for them in the body if they are not in the query string. so it would end up looking like:
$.getJSON("http://"+window.location.host+"/api/GeneratorController/setparameters", {parameter1: parameter1, parameter2:parameter2 ...});

Well, the first thing to check is to make sure that your server-side function is returning the values you expect. You can do this with Chrome's developer tools or with the Firebug Firefox extension, and I think IE10 has something equivalent, too. Go to the "net" tab, find the request corresponding to your API call, and take a look at what the server responded with.

Please add the line
alert("api/GeneratorController/setparameters/"+firstparemeter+"/"+secondparameter+"/"+thirdparameter+"/"+fourthparameter+"/"+fifthparameter+"/"+sixthparameter)
Then call your script and take the output of the alert into a browser. Then check if your application Handels that route.
By the way I think you have a typo. I guess it should be firstparameter.
I assume you would like to do
"api/GeneratorController?foo=Bar
But when you are new to this, I would suggest that you first try the example like it is. And After that you can start changing setails.

So I found what was the problem with my code
Two things :
1- I shouldn't use the word "Controller" when I call my API ,it should be api/Generator/...
2- the function name needs to start with "get" and not "set" since it "gets" the return value from the api
Thanks everyone!

Problems with displaying JSON data I got from a server

I'm new to JSON/AJAX and
I've some problems with displaying data out of a JSON-object I've got from a server..
The url "http://localhost:8387/rest/resourcestatus.json" represents this object, which I would like to display via HTML/Javascript.. This object stores some monitoring information:
{"groupStatus":[
{"id":"AL Process","time":1332755316976,"level":0,"warningIds":[],"errorIds":[]},
{"id":"AL:instance1","time":1332919465317,"level":0,"warningIds":[],"errorIds":[]},
{"id":"AL:instance2","time":1332919465317,"level":1,"warningIds":["documentarea.locked"],"errorIds":[]},
{"id":"SL","time":1331208543687,"level":0,"warningIds":[],"errorIds":[]}
]}
Since the requested url is different from my domain I can't create a typical XMLHttpRequest.. So I found out that there's an AJAX cross-domain request which can be realised via jQuerys "getJSON()" method.
I want to display the ids and their level in a table.
Any solution to achieve this?

i think you are referring to JSONP. see jQuery.ajax Ex:
var url = 'http://localhost:8387/rest/resourcestatus.json';
$.getJSON(url+'?callback=?', function(data)
{
//data is
/*{
"groupStatus":
[
{"id":"AL Process","time":1332755316976,"level":0,"warningIds":[],"errorIds":[]},
{"id":"AL:instance1","time":1332919465317,"level":0,"warningIds":[],"errorIds":[]},
{"id":"AL:instance2","time":1332919465317,"level":1,"warningIds":["documentarea.locked"],"errorIds":[]},
{"id":"SL","time":1331208543687,"level":0,"warningIds":[],"errorIds":[]}
]
}*/
});
on the server side you will need to wrap the response into a JavaScript function: response = Request["callback"] +"("+ response+")";
the result will look like this:
?({"groupStatus":[{"id":"AL ....})
So the browser will actually load a valid java script code.

The callback function of $.getJSON contains the result of the AJAX call in it's argument.
$.getJSON('http://localhost:8387/rest/resourcestatus.json', function(data) {
$(data.groupStatus).each(function() {
// do something with $(this).id
});
});

Facebook Search API Untrusted Connection

I am trying to search the Facebook API from my application using javascript FB.api(url, success function) and the JSON object that comes back contains the error: "Search queries are unsupported for this connection."
The url I'm using is: "https://graph.facebook.com/search?q=Bamboo&type=page&access_token=", which works when I'm testing it in browser
Why is my search unsupported???

The problem is your url. You only put your graph api command in the url parameter, thus the "https://graph.facebook.com" shouldn't be included.
For using the search call,
var urlCall = "/search?q=Bamboo&type=page&access_token=";
FB.api(urlCall, function(response) {
//you code to execute
});
and not the following
url = "https://graph.facebook.com/search?q=Bamboo&type=page&access_token="

jsonp request not working in firefox

I am trying a straightforward remote json call with jquery. I am trying to use the reddit api. http://api.reddit.com. This returns a valid json object.
If I call a local file (which is what is returned from the website saved to my local disk) things work fine.
$(document).ready(function() {
$.getJSON("js/reddit.json", function (json) {
$.each(json.data.children, function () {
title = this.data.title;
url = this.data.url;
$("#redditbox").append("<div>" + title + "<div>");
});
});
});
If I then try to convert it to a remote call:
$(document).ready(function() {
$.getJSON("http://api.reddit.com", function (json) {
$.each(json.data.children, function () {
title = this.data.title;
url = this.data.url;
$("#redditbox").append("<div>" + title + "<div>");
});
});
});
it will work fine in Safari, but not Firefox. This is expect as Firefox doesnt do remote calls due to security or something. Fine.
In the jquery docs they say to do it like this (jsonp):
$(document).ready(function() {
$.getJSON("http://api.reddit.com?jsoncallback=?", function (json) {
$.each(json.data.children, function () {
title = this.data.title;
url = this.data.url;
$("#redditbox").append("<div>" + title + "<div>");
});
});
});
however it now stops working on both safari and firefox. The request is made but what is return from the server appears to be ignored.
Is this a problem with the code I am writing or with something the server is returning? How can I diagnose this problem?
EDIT Changed the address to the real one.

JSONP is something that needs to be supported on the server. I can't find the documentation, but it appears that, if Reddit supports JSONP, it's not with the jsoncallback query variable.
What JSONP does, is wrap the JSON text with a JavaScript Function call, this allows the JSON text to be processed by any function you've already defined in your code. This function does need to be available from the Global scope, however. It appears that the JQuery getJSON method generates a function name for you, and assigns it to the jsoncallback query string variable.

The URL you are pointing to (www.redit.com...) is not returning JSON! Not sure where the JSON syndication from reddit comes but you might want to start with the example from the docs:
$(document).ready(function() {
$.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?", function (data) {
$.each(data.items, function(i,item){
$("<img/>").attr("src", item.media.m).appendTo("#redditbox");
if ( i == 4 ) return false;
});
});
});
(apologies for formatting)
EDIT Now I re read your post, I see you intended to go to api.reddit.com unfortunately you haven't got the right parameter name for the json callback parameter. You might need to further consult the reddit documentation to see if they support JSONP and what the name of the callback param should be.

I'm not sure about reddit.com, but for sites that don't support the JSONP idiom you can still create a proxy technique (on the backend) that would return the reddit JSON, and then you would just make an ajax request to that that.
So if you called http://mydomain.com/proxy.php?url=http://api.reddit.com:
<?php
$url = $_GET["url"];
print_r(file_get_contents($url));
?>

http://api.reddit.com/ returns JSON, but doesn't appear to be JSONP-friendly. You can verify this, if you have GET, via
% GET http://api.reddit.com/?callback=foo
which dumps a stream of JSON without the JSONP wrapper.
http://code.reddit.com/browser/r2/r2/controllers/api.py (line 84) shows the code looking for 'callback' (not 'jsoncallback'). That may be a good starting point for digging through Reddit's code to see what the trick is.