JSON解析返回未定义

Question

I'm receiving a STOMP message with some JSON data, the problem is that I one case the code that I'm using works

function connect() {
    var socket = new SockJS('/gs-guide-websocket');
    stompClient = Stomp.over(socket);
    stompClient.connect({}, function (frame) {
        setConnected(true);
        console.log('Connected: ' + frame);
        stompClient.subscribe('/topic/greetings', function (greeting) {
            console.log("data -->" +greeting + " <-- data");
            console.log(JSON.parse(greeting.body) + " <-- JSON object");
            console.log(JSON.parse(greeting.body).content + " <-- parsed data");
            showGreeting(JSON.parse(greeting.body).content);
        });
    });
}

the result

data -->MESSAGE
content-length:34
message-id:4wb1eunw-1
subscription:sub-0
content-type:application/json;charset=UTF-8
destination:/topic/greetings
content-length:34

{"content":"user has subscribed!"} <-- data
[object Object] <-- JSON object
user has subscribed! <-- parsed data

And I'm using almost the same code in another project

function connect() {
    var socket = new SockJS('/gs-guide-websocket');
    stompClient = Stomp.over(socket);
    stompClient.connect({}, function (frame) {
        setConnected(true);
        console.log('Connected: ' + frame);
        stompClient.subscribe('/golden/notification', function (notification) {
            console.log("data -->" +notification + " <-- data");
            console.log(JSON.parse(notification.body) + " <-- JSON object");
            console.log(JSON.parse(notification.body).content + " <-- parsed data");
            showNotification(JSON.parse(notification.body).content);
        });
    });
}

But the result is somehow different

data -->MESSAGE
content-length:39
message-id:wh4z1ahx-0
subscription:sub-0
content-type:application/json;charset=UTF-8
destination:/golden/notification
content-length:39

{"notification": "user has subscribed!"} <-- data
[object Object] <-- JSON object
undefined <-- parsed data

I'm a bit new to Js so the answer may be really simple but i can't findany solutions to solve this problem.

PS this script is part of a Sring Boot application and the librarys are the same.

Answer 1

So thanks to @CertainPerformance. As you see in the first example my JSON object had an element "content"

{"content":"user has subscribed!"}

And it got its value by using JSON.parse(notification.body).content

But in the second example, there was no element "content" only "notification"

{"notification": "user has subscribed!"}

So to get the value of "notification" you need to use JSON.parse(notification.body).notification

I hope that this post will be helpful for someone.