Security & Quality

Clerk Authentication

Integrate Clerk for complete user management with pre-built UI components and multi-factor authentication.

Claude Code Cursor Copilot Windsurf

Overview

Clerk is a modern authentication and user management platform that provides drop-in UI components, flexible APIs, and admin dashboards. Unlike traditional auth libraries, Clerk handles the entire user lifecycle including sign-up, sign-in, profile management, organization management, and multi-factor authentication.

Clerk offers pre-built, customizable components like SignIn, SignUp, UserButton, and UserProfile that can be embedded directly into your application. These components support theming and localization out of the box. The platform integrates with Next.js, React, Remix, Expo, and other frameworks with dedicated SDKs.

Security features include bot detection, brute-force protection, device tracking, and session management with configurable token lifetimes. Clerk also provides organization management for B2B applications, allowing you to implement team-based access control with invitations and role hierarchies.

Who Is This For?

Add authentication with pre-built UI to a Next.js app
Implement organization-based multi-tenancy
Set up multi-factor authentication with SMS or TOTP
Protect routes with Clerk middleware in Next.js

Installation

Setup for Claude Code

npm install @clerk/nextjs

Configuration

// middleware.ts
import { clerkMiddleware } from "@clerk/nextjs/server"
export default clerkMiddleware()

export const config = {
  matcher: ["/((?!.*\..*|_next).*)", "/", "/(api|trpc)(.*)"],
}