如何使用javascript访问json对象？

Question

I am not an expert in json parsing so please bear with me if i ask simple question.I have a json response like this :

{
    "resp": [{
        "Key": "123423544235343211421412",
        "id": "12"
    }]
}

I want to access value of key and id (123423544235343211421412,12) .I tried following but i can't get the values!

I appreciate if you guys show me how to get those values.Thanks

var postData = {
    Name: "Galaxy",
    action: "token"
};  

$.ajax("https://someapiurl/getit.aspx",{
    type : 'POST',      
    data: JSON.stringify(postData),
    contentType: "application/json",    
    success: function(data) {
        var json = JSON.parse(data);
        alert(json.resp[0].Key); 
        alert(json.resp[1].id);  
    },
    contentType: "application/json",
    dataType: 'json'
});

Answer 1

You're almost there. jQuery automatically parses the response as JSON for you when you specify dataType: 'json'

$.ajax('https://someapiurl/getit.aspx', {
    method: 'POST',
    contentType: 'application/json; charset=UTF-8',
    dataType: 'json',
    data: JSON.stringify(postData)
}).done(function(obj) {
    alert(obj.resp[0].Key);
    alert(obj.resp[0].id);
})