Stored in a variable named "response", I have the JSON value below:
{"rsuccess":true,"errorMessage":" ","ec":null,"responseList":[{"id":2,"description":"user1"},{"id":1,"description”:"user2"}]}var users=response.responseList;
var l = users.length;
However, this code results in an error.
[Error] TypeError: undefined is not an object (evaluating 'users.length')Once you have received the response from the callback function, you will need to transform the JSON string into an object by utilizing
JSON.parse(response);
It seems there is a syntax error in this line that you might have missed
[{"id":2,"description":"user1"},{"id":1,"description”:"user2"}]}
The double quote around the description identifier is not closed properly. Simply adjust it to:
{"id":1,"description":"user2"}
Once you make this change, everything should work correctly
Variables that are undefined do not function as objects, and therefore do not possess properties like length.
You have yet to change your JSON data into an object.
To do so, utilize the following code:
var obj = eval("(" + json + ')');The eval() function runs the code provided and generates a native JavaScript object.
However, many individuals critique the use of eval() when handling unsanitized input.
Your safest option is to employ the native JavaScript method: JSON.parse(jsonString);, which was specifically designed for parsing JSON data and converting it into an object.
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