npx nuxi@latest module add auth-utils

# .env
NUXT_SESSION_PASSWORD=password-with-at-least-32-characters

<script setup>
const { loggedIn, user, session, fetch, clear } = useUserSession()
</script>

<template>
  <div v-if="loggedIn">
    <h1>Welcome {{ user.login }}!</h1>
    <p>Logged in since {{ session.loggedInAt }}</p>
    <button @click="clear">Logout</button>
  </div>
  <div v-else>
    <h1>Not logged in</h1>
    <a href="/auth/github">Login with GitHub</a>
  </div>
</template>

interface UserSessionComposable {
  /**
   * Computed indicating if the auth session is ready
   */
  ready: ComputedRef<boolean>
  /**
   * Computed indicating if the user is logged in.
   */
  loggedIn: ComputedRef<boolean>
  /**
   * The user object if logged in, null otherwise.
   */
  user: ComputedRef<User | null>
  /**
   * The session object.
   */
  session: Ref<UserSession>
  /**
   * Fetch the user session from the server.
   */
  fetch: () => Promise<void>
  /**
   * Clear the user session and remove the session cookie.
   */
  clear: () => Promise<void>
}

// Set a user session, note that this data is encrypted in the cookie but can be decrypted with an API call
// Only store the data that allow you to recognize a user, but do not store sensitive data
// Merges new data with existing data using defu()
await setUserSession(event, {
  user: {
    // ... user data
  },
  loggedInAt: new Date()
  // Any extra fields
})

// Replace a user session. Same behaviour as setUserSession, except it does not merge data with existing data
await replaceUserSession(event, data)

// Get the current user session
const session = await getUserSession(event)

// Clear the current user session
await clearUserSession(event)

// Require a user session (send back 401 if no `user` key in session)
const session = await requireUserSession(event)

// auth.d.ts
declare module '#auth-utils' {
  interface User {
    // Add your own fields
  }

  interface UserSession {
    // Add your own fields
  }
}

export {}

export default defineNuxtConfig({
  runtimeConfig: {
    oauth: {
      // provider in lowercase (github, google, etc.)
      <provider>: {
        clientId: '...',
        clientSecret: '...'
      }
    }
  }
})

export default oauthGitHubEventHandler({
  config: {
    emailRequired: true
  },
  async onSuccess(event, { user, tokens }) {
    await setUserSession(event, {
      user: {
        githubId: user.id
      }
    })
    return sendRedirect(event, '/')
  },
  // Optional, will return a json error and 401 status code by default
  onError(event, error) {
    console.error('GitHub OAuth error:', error)
    return sendRedirect(event, '/')
  },
})

// server/plugins/session.ts
export default defineNitroPlugin(() => {
  // Called when the session is fetched during SSR for the Vue composable (/api/_auth/session)
  // Or when we call useUserSession().fetch()
  sessionHooks.hook('fetch', async (session, event) => {
    // extend User Session by calling your database
    // or
    // throw createError({ ... }) if session is invalid for example
  })

  // Called when we call useUserSession().clear() or clearUserSession(event)
  sessionHooks.hook('clear', async (session, event) => {
    // Log that user logged out
  })
})

<script setup lang="ts">
// When using useAsyncData
const { data } = await useAsyncData('team', () => useRequestFetch()('/api/protected-endpoint'))

// useFetch will automatically use useRequestFetch during SSR
const { data } = await useFetch('/api/protected-endpoint')
</script>

<template>
  <header>
    <AuthState v-slot="{ loggedIn, clear }">
      <button v-if="loggedIn" @click="clear">Logout</button>
      <NuxtLink v-else to="/login">Login</NuxtLink>
    </AuthState>
  </header>
</template>

<template>
  <header>
    <AuthState>
      <template #default="{ loggedIn, clear }">
        <button v-if="loggedIn" @click="clear">Logout</button>
        <NuxtLink v-else to="/login">Login</NuxtLink>
      </template>
      <template #placeholder>
        <button disabled>Loading...</button>
      </template>
    </AuthState>
  </header>
</template>

export default defineNuxtConfig({
  modules: ['nuxt-auth-utils'],
  runtimeConfig: {
    session: {
      maxAge: 60 * 60 * 24 * 7 // 1 week
    }
  }
})

{
  name: 'nuxt-session',
  password: process.env.NUXT_SESSION_PASSWORD || '',
  cookie: {
    sameSite: 'lax'
  }
}

# Install dependencies
npm install

# Generate type stubs
npm run dev:prepare

# Develop with the playground
npm run dev

# Build the playground
npm run dev:build

# Run ESLint
npm run lint

# Run Vitest
npm run test
npm run test:watch

# Release new version
npm run release