What is the best method to retrieve JSON data from a Rest API?

Question

What is the best method to retrieve JSON data from a Rest API?

In my JavaScript code, I am creating an object:

    var t = null;
            $.getJSON('http://localhost:53227/Home/GetData', function (data) {
                alert(data);
                t = data;
            });
            alert(t);

After alerting data, I receive an object, but when I alert t, it shows null.

Could someone provide guidance on how to assign the returned data to "t"?

javascript ajax json

Answer 1

Answer №1

The operation will function as intended - the problem lies not in the fact that t is not defined, but in the fact that you are triggering alert(t) before the getJSON callback is completed. It is recommended to execute alert(t) immediately after t = data;

To clarify, your current sequence of actions is as follows:

Define t as null
Execute server script
alert(t) --> t remains null!
(some time passes) receive JSON response
alert data
update t with data

...as shown, at step 3 't' will still be null. To resolve this issue, try the following:

var t = null;

$.getJSON('http://localhost:53227/Home/GetData', function (data) {
    alert(data);
    t = data;
    alert(t);
});

Thank you

Answer 2

The operation will function as intended - the problem lies not in the fact that t is not defined, but in the fact that you are triggering alert(t) before the getJSON callback is completed. It is recommended to execute alert(t) immediately after t = data;

To clarify, your current sequence of actions is as follows:

Define t as null
Execute server script
alert(t) --> t remains null!
(some time passes) receive JSON response
alert data
update t with data

...as shown, at step 3 't' will still be null. To resolve this issue, try the following:

var t = null;

$.getJSON('http://localhost:53227/Home/GetData', function (data) {
    alert(data);
    t = data;
    alert(t);
});

Thank you

What is the best method to retrieve JSON data from a Rest API?

Answer №1

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