[UserScript] Extract and display user unique id in twitter

TwitterUserIDExtractor.js

// ==UserScript==
// @name         Twitter User ID Extractor
// @namespace    https://estar-lab.net/
// @version      5.1
// @description  ユーザの固有IDを抽出します。
// @author       silver-mixer
// @match        https://x.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=twitter.com
// @grant        none
// ==/UserScript==

(() => {
	'use strict';
	const userMap = new Map(); // <screen_name:string, userId:string>

	const updateUserIDElement = () => {
		const screenName = location.href.match(/x\.com\/([a-zA-Z0-9_]+)/)[1] ?? null;
		const userId = userMap.get(screenName) ?? null;
		if(screenName === null || userId === null){
			console.log('failed to get screen_name or userId', screenName, userId);
			return;
		}
		const linkTag = document.getElementById('_tuie_link');
		if(linkTag !== null){
			console.log('update link');
			linkTag.href = `https://x.com/intent/user?user_id=${userId}`;
			linkTag.textContent = `@${screenName} (${userId})`;
		}else{
			console.log('create link');
			const infoPane = document.querySelectorAll('.css-175oi2r.r-1adg3ll.r-6gpygo')[2];
			infoPane.insertAdjacentHTML('beforeend', `<div><a id="_tuie_link" style="color: rgb(139, 152, 165);" href="https://x.com/intent/user?user_id=${userId}">@${screenName} (${userId})</a></div>`);
		}
	};

	// Extract UserID from UserByScreenName
	const oXHROpen = XMLHttpRequest.prototype.open;
	XMLHttpRequest.prototype.open = function(){
		const openURL = arguments[1];
		if(/\/UserByScreenName/.test(openURL)){
			this.addEventListener('load', () => {
				const data = JSON.parse(this.responseText);
				const screenName = data?.data?.user?.result?.core?.screen_name;
				const userId = data?.data?.user?.result?.rest_id;
				if(screenName !== null && userId !== null){
					userMap.set(screenName, userId);
					updateUserIDElement();
				}
			});
		}
		oXHROpen.apply(this, arguments);
	};

	const oPushState = history.pushState.bind(history);
	history.pushState = function(){
		oPushState(...arguments);
		setTimeout(() => {
			updateUserIDElement();
		}, 500);
	};
})();

Twitter User ID Extractor

簡易バージョン履歴

バージョン	修正日	変更内容
v5.1	2026/01/03	ページ遷移時にユーザID表示が消えるバグを修正
v5.0	2025/12/31	Twitter(現X)向けに処理を一新。Tampermonkeyでの動作を前提とした形に修正。
v4		Tampermonkey向けにヘッダコメントを修正
v3		動作しないバグを修正
v2		現Twitter用に再作成
v1		旧Twitter用に作成(非公開)