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value missing on AJAX response

I can't find what the error is in an AJAX call.
I have a PHP file output:
[{"value":"123","name":"My Name"}]
and this output is correct. And my AJAX call returns undefined after success:
$.ajax({
type: "POST",
url: "correct_file_location.php",
data: $(this.form).serialize(),
dataType: "json",
success: function (pk) {
alert(pk.value);
$("#label_id_name").text(pk.value);
},
error: function (){
alert("error");
}
});

Since the result is an array of objects, you need to first get the object from the array, and then access the properties of that object.
pk[0].value
should work.

*It is showing undefined because you are getting an array of objects and not only object *
try what #freedomn-m suggested in the comments

Try below code it will be work.
$.ajax({
type: "POST",
url: "correct_file_location.php",
//data: $(this.form).serialize(),
dataType: "json",
success: function (pk) {
var data1 = JSON.parse(pk[0].value);
console.log(data1);
// $("#label_id_name").text(pk.value);
},
error: function (){
alert("error");
}
}) ;

Your code will also work but your php response code must be in javascript object.
Please add below code in 'correct_file_location.php' and check with your ajax code.
'{"value":"123","name":"My Name"}';

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.

AJAX: How to use returned array?

I have an ajax POST that sends data to a controller function and that function returns a string array back to the ajax call as the default 1st parameter in the ajax success method. When I tried to use the returned data, it won't let me print the 1st element to an alert box. How come?
i.e.
$.ajax(
{
type: "POST",
url: "../Home/stringSplitFunct",
data: { 'parameter1': Input },
success: function (response)
{
alert(response[0]);
}
});
In fact, I don't think it even recognize it as a string array.

You need to specify dataType. Read more here.
$.ajax({
type: "POST",
url: "../Home/stringSplitFunct",
data: { 'parameter1': Input },
dataType: 'json',
success: function (response)
{
alert(response[0]);
}
});

Looks like the data is being returned as a raw sting.
Use dataType property for your ajax request
dataType: 'json'
Also avoid using alert as it stops the execution flow. Use console.log instead

javascript jquery and using eval

i am currenty using jquery plugin to read a data file (data.html)
data.html has below format
[10,20,30,40,50]
my jquery data request and the javascript to return values is below
function test(){
var result=$.ajax({
url:'data.html',
type:'get',
dataType:'text',
async:false,
cache:false
}).responseText
return result;};
var my=test();
alert(my[0])
i want to get these values in the array format i.e i want my[0] to be value 10, but instead i get "[".
If i use eval function
my=eval(test());
i can get 10, but is there any other better way to store the returned ajax calls into an array instead of string?
Thanks
i tried the below answer and i am bit puzzled, the follow code results in myArray is null (in firebug), but i put async:false then it works. why do i need async:false to store the values into array ? (http://stackoverflow.com/questions/133310/how-can-i-get-jquery-to-perform-a-synchronous-rather-than-asynchronous-ajax-req)
jQuery.extend({getValues: function(url) {
var result = null;
$.ajax({
url: url,
type: 'get',
dataType: 'json',
cache: false,
success: function(data) {result = data;}
});
return result;}});
myArray=$.getValues("data.html");
alert(myArray[1]);

You don't need eval. Just indicate the proper dataType: 'json':
function test() {
return $.ajax({
url: 'data.html',
type: 'get',
dataType: 'json',
async: false,
cache: false
}).responseText;
}
var my = test();
alert(my[0]);
or even better do it asynchronously:
function test() {
$.ajax({
url: 'data.html',
type: 'get',
dataType: 'json',
cache: false,
success: function(result) {
alert(result[0]);
}
});
}
test();

I think jquery $.getScript('data.html',function(){alert("success"+$(this).text())} might be simpler. I have not had time to try it so if I'm on right track, improve this answer, if not I'm happy to learn now...

Can't query JSON using jQuery

I'm using jQuery to grab some JSON data. I've stored it in a variable called "ajaxResponse". I cant pull data points out of it; I'm getting ajaxResponse.blah is not defined. typeof is a string. Thought it should be an object.
var getData = function (url) {
var ajaxResponse = "";
$.ajax({
url: url,
type: "post",
async: false,
success: function (data) {
ajaxResponse = data;
}
});
return ajaxResponse;
},
...
typeof ajaxResponse; // string
ajaxResponse.blah[0].name // ajaxResponse.blah is not defined

make sure you specify option dataType = json
$.ajax({
url: url,
type: "post",
dataType: "json",
async: false,
success: function (data) {
ajaxResponse = data;
}
});

Q8-coder has the right of it, but to give you some details: your server is really passing back a string that you've formatted into JSON. You'll need to tell jQuery what to expect, otherwise it just assumes it received a string.
Add the following to your $.ajax options:
dataType: "json"
Also, refer to the jQuery API for examples and documentation for these options.