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AJAX call error - status of 400 (Bad Request)

I'm trying to use the BloomAPI to retrieve Doctor's NPI number by querying with their first and last name. I'm using Jquery Ajax to make a get request for the JSON data.
I am able to get the JSON data when I do CURL in the terminal: curl -X GET 'http://www.bloomapi.com/api/search?offset=0&key1=last_name&op1=eq&value1=LIN&key2=first_name&op2=eq&value2=JOHN'
For the purpose below - I just hardcoded in the params into the URL.
I get a "Failed to load resource: the server responded with a status of 400 (Bad Request" Error. Any idea what I might be doing wrong?
$.ajax({
type: 'GET',
url: 'http://www.bloomapi.com/api/search?offset=0&key1=last_name&op1=eq&value1=LIN&key2=first_name&op2=eq&value2=JOHN',
dataType: 'jsonp'
}).done(function(server_data) {
console.log(server_data)
}).fail(console.log("failed"));

This was a weird one... your code is actually basically correct, however, it appears bloomapi does not support disabling caching in the way jquery does it.
When you make the jquery call you have, the actual url becomes something like this:
http://www.bloomapi.com/api/search?offset=0&key1=last_name&op1=eq&value1=LIN&key2=first_name&op2=eq&value2=JOHN&callback=jQuery111207365460020955652_1428455335256&_=1428455335257
The callback is a jsonp construct, and the _ is a way of breaking caching. However, bloomapi appears to not like this:
jQuery111207365460020955652_1428455335256({"name":"ParameterError","message":"_ are unknown parameters","parameters":{"_":"is an unknown parameter"}});
To get around this, you can disable cache busting like so:
$.ajax({
type: 'GET',
url: 'http://www.bloomapi.com/api/search?offset=0&key1=last_name&op1=eq&value1=LIN&key2=first_name&op2=eq&value2=JOHN',
dataType: 'jsonp',
cache: true
}).done(function(server_data) {
console.log(server_data)
}).fail(function() { console.log("failed") });
You will have to be careful of how else you break the cache if that's an issue; the api provider may be able to provide feedback on how to do this.
In the future, you can easily check the errors you are receiving/what you are sending using a web debugger; I used Fiddler to figure this out.

Script5007 error "object not found" only on Internet Explorer

When I first load a page I make an ajax call to bring some data for the client-side. The call is made to a different domain and the answer comes as JSONP. The call looks similar to:
$.ajax({
type: "GET",
url: url + "?callback=?",
dataType: "jsonp",
contentType: "application/javascript;charset=UTF-8",
async: true,
success: successCallback,
error: errorCallback,
cache: true,
jsonpCallback: jsonCB
});
'application/javascript' would be the possible culprit here as I did my research on the subject but this is present in a previous version of the code which never had this problem.
On all browsers except IE I receive the following error (sometimes, usually the first time and then the problem dissappears) :
script5007 object not found - line 1, char 1
The JSONP received looks like that:
func({"result":"abc"})
The param of the func is a valid JSON as I checked this using jslint.
Any idea will be highly appreciated! Thank you!

You're missing the object brackets { } inside your $.ajax function. Modify it like so:
$.ajax({
url:'',
contentType: 'application/javascript;charset=UTF-8',
crossDomain:true
......
});
The jQuery $.ajax method either takes a url parameter and an optional parameter of additional options specified as an object, or an object parameter including the url.

Unable to get a simple jQuery.Ajax call to work

I'm pretty new to the web-dev world, and I'm having a bear of a time getting a simple jQuery.ajax call to work. Here is the call:
var url = "http://client.the_url.com/get_account_data.php";
$.ajax({
url: url,
dataType: 'json',
success: function(resultsData){
resultsDataString = JSON.stringify(resultsData, null, 4);
alert("We're finally making the call.");
},
error:function (xhr, ajaxOptions, error){
alert("Error");
}
});
I can copy and paste the url into a browser and it renders what I would expect:
{
"id":"Level 3.xpusdscah",
"type":"Level 3",
"name":"xpusdscah",
"total":0,
"in":0,
"out":0
}
Instead, I get the Error alert every time. :/.
The php script I'm hitting starts with the header:
header('Content-type: application/json');
I was trying to pass params to the php script, but now I'm not even doing that. I would think this should be a 'no brainer', but if it is, then I have no brain. I'm trying to figure out how to use wireshark right now, but should I really need to use wireshark to debug a call that is as simple as it gets to a php file?
Can anyone help me? What I'm really hoping for is a "Well duh, you didn't do (insert obvious solution here)!
Thanks in advance,
Fledgling web developer

First, your callback function isn't helpful. It just shows the text "Error" every time. You want to actually display what the error is, like this:
$.ajax({
url: url,
dataType: 'json',
data: data,
success: function(resultsData){
resultsDataString = JSON.stringify(resultsData, null, 4);
alert("We're finally making the call.");
},
error:error(jqXHR, textStatus, errorThrown){
alert("Error:" + textStatus+ "," + errorThrown);
}
});
Your parameters for the error callback were named strangely. The documentation says the second param is a text error code, and the errorThrown is the HTTP status code provided by the web server. See the documentation here: http://api.jquery.com/jQuery.ajax/
Next, you'll want to grab a packet sniffer. This will allow you to inspect the packets going to and from the web server and see the error message that it is throwing. A good free option is Fiddler.

The data you're sending is not json.
var data = "login="+localLogin+"&pw="+localPassword+"&forAccount="+forAccount+"&forAccountType="+forAccountType+"&topAccount="+topAccount+"&fromDate="+fromDate+"&toDate="+toDate;
Should be something like this:
var data = '{"Key1":"' + Value1 + '","Key2":"' + Value2 .... + '""}';
And perhaps you should add the type as POST and content type like this:
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: ....

try these:
inspect the Network tab on your console.
copy and paste the response and parse it in the console command line to verify the JSON is well formed.
show more verbose error description.

How do I pass or parse that access_token from the Dom to a Variable I can then Store and call for access_token?

With help from others I've gotten to the point where I can see the json return from foursquare but any attempts to call it yield an error.
Essentially, if I'm in Firebug and look at the net objects I see the status 200
If I click on the JSON tab I can see my access_token, but how do I extract it from there so I can use for API calls?
Here's the latest code tried.
var jsonUrl = url +"&callback=?";
var access_token;
$("#getJSON").click(function() {
$.getJSON(jsonUrl, { dataType: "JSONP" }, function(json){
...
access_token = json.access_token;
...
});
});
also tried
$.ajax({
dataType: 'jsonp',
jsonp: 'callback',
url: url,
success: function (json) {
console.log(json.access_token);
},
});
But when I try and alert(access_token); or run a foursquare api call I get the following errors
Resource interpreted as Script but transferred with MIME type application/json.
Uncaught SyntaxError: Unexpected token :
checkinsGET https://api.foursquare.com/v2/users/self/checkins?oauth_token=undefined&format=json 401 (Unauthorized)
I feel like its ready and waiting for me to call it, but how on earth do I print it from the Dom into a var that I can use? Been fighting for hours and been trying all my research techniques for some reason this one's elluding me. Thanks for everyone's help so far, I'm really hoping to get passed this!

Try removing the "&callback=?" from the url. I think jQuery adds that for you if you set the dataType to jsonp.
EDIT:
from the jquery ajax documentation describing the dataType parameter:
"jsonp": Loads in a JSON block using
JSONP. Will add an extra "?callback=?"
to the end of your URL to specify the
callback.

jQuery Ajax call No element found issue

I am getting a javascript error on firefox 3.5, when trying to call an ajax method.
Please find the error below:
XML Parsing Error: no element found Location: moz-nullprincipal:{1a2c8133-f48f-4707-90f3-1a2b2f2d62e2} Line Number 1, Column 1:
^
this is my javascript function:
function Update(Id) {
$.ajax({
type: "GET",
url: ROOT_URL + "/sevice/udates.svc/Update?Id=" + Id,
success: function(response) {
},
async: false
});
}

I fixed the problem by setting mimeType to "text/html"

The ajax call expects XML back (perhaps due to bad guessing) and tries to parse it and fails if nothing is returned or it is not valid XML..
Use the dataType option to specify the format of the response.
From the comments it looks like some browsers cannot handle an no-content response. So, a workaround for such cases might be to return something from your service (even a single space).

I've come across an alternative cause of this - might help someone.
If you make a $.ajax request (in my case a PUT request) that returns a 200 header but no body content I've seen this same XML Parsing error message occur - even when the dataType is set to json.
(At least) two solutions work:
Make all API PUT requests return some content, or
Return a 204 'No Content' header instead (what I ended up doing)

It's a known FireFox bug.
https://bugzilla.mozilla.org/show_bug.cgi?id=547718
to quick fix this , you maybe can return an response with html structure(but no content).

async is also part of options. Also specify the dataType as xml
function Update(Id) {
$.ajax({
type: "GET",
async: false,
dataType: "XML",
url: ROOT_URL + "/sevice/udates.svc/Update?Id=" + Id,
success: function(response) {
}
});
}

You need to send html document to the output (the output udates.svc in your case) . If you use ASP.NET, you could do the following:
Response.Clear();
Response.Write("<html xmlns=”http://www.w3.org/1999/xhtml”>");
Response.Write("<head><title></title></head>");
Response.Write("<body>");
Response.Write("your output");
Response.Write("</body>");
Response.Write("</html>");
Response.ContentType = "text/HTML";
Response.End();