Nuxt Auth Utils

Minimalist Authentication module for Nuxt exposing Vue composables and server utils.

Features

Secured & sealed cookies sessions
OAuth Providers

Requirements

This module only works with SSR (server-side rendering) enabled as it uses server API routes. You cannot use this module with nuxt generate.

Quick Setup

Add nuxt-auth-utils dependency to your project

# Using pnpm
pnpm add -D nuxt-auth-utils

# Using yarn
yarn add --dev nuxt-auth-utils

# Using npm
npm install --save-dev nuxt-auth-utils

Add nuxt-auth-utils to the modules section of nuxt.config.ts

export default defineNuxtConfig({
  modules: [
    'nuxt-auth-utils'
  ]
})

Add a NUXT_SESSION_PASSWORD env variable with at least 32 characters in the .env.

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

Nuxt Auth Utils can generate one for you when running Nuxt in development the first time when no NUXT_SESSION_PASSWORD is set.

That's it! You can now add authentication to your Nuxt app ✨

Vue Composables

Nuxt Auth Utils automatically adds some plugins to fetch the current user session to let you access it from your Vue components.

User Session

<script setup>
const { loggedIn, user, session, 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="/api/auth/github">Login with GitHub</a>
  </div>
</template>

Server Utils

The following helpers are auto-imported in your server/ directory.

Session Management

// 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 an 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)

You can define the type for your user session by creating a type declaration file (for example, auth.d.ts) in your project to augment the UserSession type:

declare module '#auth-utils' {
  interface UserSession {
    // define the type here
  }
}
export {}

OAuth Event Handlers

All helpers are exposed from the oauth global variable and can be used in your server routes or API routes.

The pattern is oauth.<provider>EventHandler({ onSuccess, config?, onError? }), example: oauth.githubEventHandler.

The helper returns an event handler that automatically redirects to the provider authorization page and then call onSuccess or onError depending on the result.

The config can be defined directly from the runtimeConfig in your nuxt.config.ts:

export default defineNuxtConfig({
  runtimeConfig: {
    oauth: {
      <provider>: {
        clientId: '...',
        clientSecret: '...'
      }
    }
  }
})

It can also be set using environment variables:

NUXT_OAUTH_<PROVIDER>_CLIENT_ID
NUXT_OAUTH_<PROVIDER>_CLIENT_SECRET

Supported OAuth Providers

Auth0
AWS Cognito
Battle.net
Discord
GitHub
Google
Keycloak
LinkedIn
Microsoft
Spotify
Twitch

You can add your favorite provider by creating a new file in src/runtime/server/lib/oauth/.

Example

Example: ~/server/routes/auth/github.get.ts

export default oauth.githubEventHandler({
  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, '/')
  },
})

Make sure to set the callback URL in your OAuth app settings as <your-domain>/auth/github.

Extend Session

We leverage hooks to let you extend the session data with your own data or to log when the user clear its session.

// 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 useServerSession().clear() or clearUserSession(event)
  sessionHooks.hook('clear', async (session, event) => {
    // Log that user logged out
  })
})

Development

# 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