Auth UI Components#

Complete login and signup pages with Better Auth for Next.js.

// app/(auth)/login/page.tsx
'use client'

import { signIn } from "@/lib/auth-client";
import { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";

export default function LoginPage() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const router = useRouter();

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError("");
    setIsLoading(true);

    const { data, error: authError } = await signIn.email({
      email,
      password,
    });

    setIsLoading(false);

    if (authError) {
      setError(authError.message || "Invalid email or password");
      return;
    }

    router.push("/dashboard");
    router.refresh();
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50">
      <div className="max-w-md w-full space-y-8 p-8 bg-white rounded-lg shadow">
        <div>
          <h2 className="text-3xl font-bold text-center">
            Sign in to your account
          </h2>
        </div>

        <form onSubmit={handleSubmit} className="space-y-6">
          {error && (
            <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded">
              {error}
            </div>
          )}

          <div>
            <label htmlFor="email" className="block text-sm font-medium">
              Email address
            </label>
            <input
              id="email"
              type="email"
              required
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium">
              Password
            </label>
            <input
              id="password"
              type="password"
              required
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
            />
          </div>

          <button
            type="submit"
            disabled={isLoading}
            className="w-full flex justify-center py-2 px-4 border border-transparent rounded-md shadow-sm text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50"
          >
            {isLoading ? "Signing in..." : "Sign in"}
          </button>

          <p className="text-center text-sm text-gray-600">
            Don't have an account?{" "}
            <Link href="/signup" className="font-medium text-blue-600 hover:text-blue-500">
              Sign up
            </Link>
          </p>
        </form>
      </div>
    </div>
  );
}

// app/(auth)/signup/page.tsx
'use client'

import { signUp } from "@/lib/auth-client";
import { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";

export default function SignupPage() {
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [error, setError] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const router = useRouter();

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError("");

    // Validation
    if (password !== confirmPassword) {
      setError("Passwords don't match");
      return;
    }

    if (password.length < 8) {
      setError("Password must be at least 8 characters");
      return;
    }

    setIsLoading(true);

    const { data, error: authError } = await signUp.email({
      email,
      password,
      name,
    });

    setIsLoading(false);

    if (authError) {
      setError(authError.message || "Failed to create account");
      return;
    }

    router.push("/dashboard");
    router.refresh();
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50">
      <div className="max-w-md w-full space-y-8 p-8 bg-white rounded-lg shadow">
        <div>
          <h2 className="text-3xl font-bold text-center">
            Create your account
          </h2>
        </div>

        <form onSubmit={handleSubmit} className="space-y-6">
          {error && (
            <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded">
              {error}
            </div>
          )}

          <div>
            <label htmlFor="name" className="block text-sm font-medium">
              Full name
            </label>
            <input
              id="name"
              type="text"
              required
              value={name}
              onChange={(e) => setName(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md"
            />
          </div>

          <div>
            <label htmlFor="email" className="block text-sm font-medium">
              Email address
            </label>
            <input
              id="email"
              type="email"
              required
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md"
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium">
              Password
            </label>
            <input
              id="password"
              type="password"
              required
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md"
            />
          </div>

          <div>
            <label htmlFor="confirmPassword" className="block text-sm font-medium">
              Confirm password
            </label>
            <input
              id="confirmPassword"
              type="password"
              required
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              className="mt-1 block w-full px-3 py-2 border border-gray-300 rounded-md"
            />
          </div>

          <button
            type="submit"
            disabled={isLoading}
            className="w-full py-2 px-4 bg-blue-600 hover:bg-blue-700 text-white rounded-md disabled:opacity-50"
          >
            {isLoading ? "Creating account..." : "Sign up"}
          </button>

          <p className="text-center text-sm text-gray-600">
            Already have an account?{" "}
            <Link href="/login" className="font-medium text-blue-600 hover:text-blue-500">
              Sign in
            </Link>
          </p>
        </form>
      </div>
    </div>
  );
}

Logout Button Component#

// components/auth/logout-button.tsx
'use client'

import { signOut } from "@/lib/auth-client";
import { useRouter } from "next/navigation";

export default function LogoutButton() {
  const router = useRouter();

  const handleLogout = async () => {
    await signOut();
    router.push("/login");
    router.refresh();
  };

  return (
    <button
      onClick={handleLogout}
      className="px-4 py-2 text-sm text-red-600 hover:text-red-700"
    >
      Logout
    </button>
  );
}

// components/auth/user-dropdown.tsx
'use client'

import { useSession } from "@/lib/auth-client";
import LogoutButton from "./logout-button";
import Link from "next/link";

export default function UserDropdown() {
  const { data: session, isPending } = useSession();

  if (isPending) {
    return <div className="h-8 w-8 rounded-full bg-gray-200 animate-pulse" />;
  }

  if (!session) {
    return (
      <div className="flex gap-4">
        <Link href="/login" className="text-blue-600 hover:text-blue-700">
          Login
        </Link>
        <Link href="/signup" className="text-blue-600 hover:text-blue-700">
          Sign up
        </Link>
      </div>
    );
  }

  return (
    <div className="flex items-center gap-4">
      <span className="text-sm text-gray-700">
        {session.user.name || session.user.email}
      </span>
      <LogoutButton />
    </div>
  );
}

Protected Page Layout#

// app/(protected)/layout.tsx
import { auth } from "@/lib/auth";
import { headers } from "next/headers";
import { redirect } from "next/navigation";
import UserDropdown from "@/components/auth/user-dropdown";

export default async function ProtectedLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  const session = await auth.api.getSession({
    headers: await headers(),
  });

  if (!session) {
    redirect("/login");
  }

  return (
    <div className="min-h-screen bg-gray-50">
      <nav className="bg-white shadow">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div className="flex justify-between h-16 items-center">
            <h1 className="text-xl font-bold">My App</h1>
            <UserDropdown />
          </div>
        </div>
      </nav>

      <main className="max-w-7xl mx-auto py-6 sm:px-6 lg:px-8">
        {children}
      </main>
    </div>
  );
}

Dashboard Page#

// app/(protected)/dashboard/page.tsx
import { auth } from "@/lib/auth";
import { headers } from "next/headers";

export default async function DashboardPage() {
  const session = await auth.api.getSession({
    headers: await headers(),
  });

  return (
    <div className="px-4 py-6">
      <h1 className="text-3xl font-bold mb-4">
        Welcome, {session?.user.name}!
      </h1>

      <div className="bg-white shadow rounded-lg p-6">
        <h2 className="text-lg font-semibold mb-4">Your Profile</h2>
        <dl className="space-y-2">
          <div>
            <dt className="text-sm font-medium text-gray-500">Name</dt>
            <dd className="text-sm text-gray-900">{session?.user.name}</dd>
          </div>
          <div>
            <dt className="text-sm font-medium text-gray-500">Email</dt>
            <dd className="text-sm text-gray-900">{session?.user.email}</dd>
          </div>
          <div>
            <dt className="text-sm font-medium text-gray-500">User ID</dt>
            <dd className="text-sm text-gray-900 font-mono">{session?.user.id}</dd>
          </div>
        </dl>
      </div>
    </div>
  );
}

Form Validation with Zod#

// lib/validations.ts
import { z } from "zod";

export const loginSchema = z.object({
  email: z.string().email("Invalid email address"),
  password: z.string().min(1, "Password is required"),
});

export const signupSchema = z.object({
  name: z.string().min(2, "Name must be at least 2 characters"),
  email: z.string().email("Invalid email address"),
  password: z.string().min(8, "Password must be at least 8 characters"),
  confirmPassword: z.string(),
}).refine((data) => data.password === data.confirmPassword, {
  message: "Passwords don't match",
  path: ["confirmPassword"],
});

// Usage in form
import { loginSchema } from "@/lib/validations";

try {
  const validated = loginSchema.parse({ email, password });
  // Proceed with login
} catch (error) {
  if (error instanceof z.ZodError) {
    setError(error.errors[0].message);
  }
}

Loading States#

// components/auth/loading-button.tsx
interface LoadingButtonProps {
  isLoading: boolean;
  children: React.ReactNode;
}

export default function LoadingButton({ isLoading, children }: LoadingButtonProps) {
  return (
    <button
      type="submit"
      disabled={isLoading}
      className="w-full py-2 px-4 bg-blue-600 hover:bg-blue-700 text-white rounded-md disabled:opacity-50 disabled:cursor-not-allowed"
    >
      {isLoading ? (
        <div className="flex items-center justify-center gap-2">
          <div className="h-4 w-4 border-2 border-white border-t-transparent rounded-full animate-spin" />
          Loading...
        </div>
      ) : (
        children
      )}
    </button>
  );
}

Best Practices#

✅ Validate on both client and server - Use Zod schemas
✅ Show loading states - Disable buttons while submitting
✅ Handle errors gracefully - Display user-friendly messages
✅ Redirect after auth - Use router.push() and router.refresh()
✅ Use route groups - (auth) and (protected) for organization
✅ Style consistently - Use Tailwind CSS classes
✅ Accessibility - Add labels, ARIA attributes

Next Steps#

Better Auth Setup - Authentication configuration
Getting Started - Next.js project basics

Auth UI Components#

Login Page#

Signup Page#

Logout Button Component#

User Avatar Dropdown#

Protected Page Layout#

Dashboard Page#

Form Validation with Zod#

Loading States#

Best Practices#

Next Steps#