Array.Push overwrites the previous Value Node Js

Good day. I have an global array and it MUST be global.

var comments= [];

I have an callback of a socket where i am iterating through it and adding the values.

Better with the code :

    socket.on('commentAdded', function (data) {
    if (data !== null) {
        var stringify = JSON.stringify(data);
        var json = JSON.parse(stringify);

        Object.keys(users).forEach(function (key) {
            if (key !== "null") {
                data.eachUserId = key;
                console.log("data added with id " + key + " the size of comments is " + comments.size);
                comments.push(data);
            }
        });
        console.log("comment was added");
    }

    socket.broadcast.emit('onCommentAdded', data);
});

Here my console.Log("data added with id)... is printing everything correctly and ideally i want to add a new value to the existing data which is a json data and the name of a new value is eachUserId which value must be fully different as i am doing it inside the loop as you can see.

And here is how i get the items afterwards.

   for (var f = 0; f < Object.keys(comments).length; f++) {
        var comment = comments[f];
        var eachUserId = comment.eachUserId;
        console.log("checking with current user id" + userId + " each user id" + eachUserId + " or each user id in [] way " + comment['eachUserId']);
        if (eachUserId === userId) {
            socket.emit('onCommentAdded', comment);
        }
    }

Here the eachUserId is always the very last item which was added in loop... what am i doing wrong? Why the push() method overwrite every value?

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