Clerk

Complete user management and authentication with drop-in UI and vanilla JavaScript SDK.

• Official Website: clerk.com
• Category: Authentication & User Management
• Type: User Authentication & Management Platform

Overview

Clerk is a comprehensive authentication and user management platform built for modern web applications. While popular in React and Next.js, Clerk also provides a pure vanilla JavaScript SDK that can be loaded on static HTML pages via a script tag.

It includes pre-built modal components for sign-up, sign-in, user profiles, and organization management, eliminating the need to write backend authentication logic.

Key Highlights & Features

• Drop-In Modals: Beautiful, accessible sign-in and profile components out of the box.
• Social Logins & Passkeys: Support for Google, GitHub, Apple, passkeys, and magic links.
• Vanilla JS SDK: Load via CDN without complex build tools or frameworks.
• Session Management: Secure JWT handling and token renewal performed automatically in the browser.

How It Works with Static Websites

Add Clerk to any static HTML page using the JavaScript SDK:

<!-- Load Clerk SDK -->
<script
  async
  crossorigin="anonymous"
  data-clerk-publishable-key="pk_test_YOUR_KEY"
  src="https://cdn.jsdelivr.net/npm/@clerk/clerk-js@latest/dist/clerk.browser.js"
  type="text/javascript">
</script>

<div id="auth-container">
  <button id="sign-in-btn">Sign In</button>
  <div id="user-button"></div>
</div>

<script>
  window.addEventListener("load", async () => {
    await window.Clerk.load();

    if (window.Clerk.user) {
      document.getElementById("sign-in-btn").style.display = "none";
      window.Clerk.mountUserButton(document.getElementById("user-button"));
    } else {
      document.getElementById("sign-in-btn").addEventListener("click", () => {
        window.Clerk.openSignIn();
      });
    }
  });
</script>

When to Use It

• Adding gated content, member portals, or user dashboards to static sites.
• Websites needing secure social logins and passkeys with zero backend maintenance.
• Client portals that require complete user profile management.