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Karma display for old reddit

Displays karma in every post/title/comment

// ==UserScript==
// @name         Karma display for old reddit
// @version      1.0
// @description  Displays karma in every post/title/comment
// @author       Zenith005
// @match        https://old.reddit.com/*
// @license      none
// @grant        GM_addStyle
// @namespace https://greasyfork.org/users/1226710
// ==/UserScript==

(function() {
    'use strict';

    // Fetch User Karma
    function fetchUserKarma(username, callback) {
        const apiURL = `https://www.reddit.com/user/${username}/about.json`;

        fetch(apiURL)
            .then(response => response.json())
            .then(data => {
                const karma = data.data.total_karma || 0;
                callback(karma);
            })
            .catch(error => {
                console.error('Error fetching user karma:', error);
                callback(0);
            });
    }

    // Display User Karma
    function displayUserKarma() {
        const usernames = document.querySelectorAll('a.author');
        usernames.forEach(username => {
            const user = username.textContent;

            fetchUserKarma(user, karma => {
                const karmaSpan = document.createElement('span');
                karmaSpan.textContent = ` (${karma} karma)`;
                karmaSpan.classList.add('user-karma');
                username.parentNode.insertBefore(karmaSpan, username.nextSibling);
            });
        });
    }

    // Styling
    GM_addStyle(`
        .user-karma {
            font-weight: bold;
            color: black;
        }
    `);
})();