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Better Auth integrates with Nuxt through a server event handler and a Vue-aware auth client. Before you start, make sure you have a Better Auth instance configured. If you haven’t done that yet, check out the installation.

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Create an API route

Create a catch-all server route at server/api/auth/[...all].ts. Use Nuxt’s defineEventHandler and toWebRequest helpers to bridge the Nitro request into Better Auth’s web-standard handler.
server/api/auth/[...all].ts
import { auth } from "~/lib/auth";

export default defineEventHandler((event) => {
  return auth.handler(toWebRequest(event));
});
You can change the base path in your Better Auth configuration, but /api/auth is the recommended default.

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Create a client

Create an auth client instance and export it from a shared module. Import from better-auth/vue to get Vue-specific reactive helpers.
lib/auth-client.ts
import { createAuthClient } from "better-auth/vue";

export const authClient = createAuthClient({
  // optional client configuration
});

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useSession composable

The useSession composable returns a reactive reference to the current session. Use it directly in component <script setup> blocks.
components/UserMenu.vue
<script setup lang="ts">
import { authClient } from "~/lib/auth-client";

const session = authClient.useSession();
</script>

<template>
  <div>
    <button
      v-if="!session?.data"
      @click="() => authClient.signIn.social({ provider: 'github' })"
    >
      Continue with GitHub
    </button>
    <div v-else>
      <pre>{{ session.data }}</pre>
      <button @click="authClient.signOut()">Sign out</button>
    </div>
  </div>
</template>

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SSR usage

When using Nuxt SSR, pass useFetch to useSession so the session is fetched on the server and hydrated on the client without an extra round-trip.
pages/index.vue
<script setup lang="ts">
import { authClient } from "~/lib/auth-client";

const { data: session } = await authClient.useSession(useFetch);
</script>

<template>
  <p>{{ session }}</p>
</template>

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Server-side session access

The auth.api object exposes every Better Auth endpoint as a callable function. Access the session from any server route by passing the event headers.
server/api/me.ts
import { auth } from "~/lib/auth";

export default defineEventHandler(async (event) => {
  const session = await auth.api.getSession({
    headers: event.headers,
  });

  if (!session) {
    throw createError({ statusCode: 401, message: "Unauthorized" });
  }

  return {
    user: session.user,
    session: session.session,
  };
});

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Route middleware

Use the auth client inside a Nuxt route middleware to protect pages. Calling useSession with useFetch ensures the session check runs on the server during SSR.
middleware/auth.global.ts
import { authClient } from "~/lib/auth-client";

export default defineNuxtRouteMiddleware(async (to) => {
  const { data: session } = await authClient.useSession(useFetch);

  if (!session.value && to.path === "/dashboard") {
    return navigateTo("/");
  }
});

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