Vue Integration Guide

Learn how to integrate Supabase with Vue 3 using the Composition API, Pinia for state management, and reactive data patterns.

Why Vue + Supabase?

Reactive data with Vue’s reactivity system
Composition API for clean, reusable logic
Type-safe with TypeScript support
Pinia for centralized state management
Zero backend configuration

Quick Start

Create a Vue App

Using Vite:

npm create vite@latest my-app -- --template vue-ts
cd my-app
npm install

Install Supabase

npm install @supabase/supabase-js
npm install pinia

Set Up Environment Variables

Create .env:

VITE_SUPABASE_URL=your-project-url
VITE_SUPABASE_ANON_KEY=your-anon-key

Create Supabase Client

Create src/lib/supabase.ts:

import { createClient } from '@supabase/supabase-js'

const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
const supabaseAnonKey = import.meta.env.VITE_SUPABASE_ANON_KEY

export const supabase = createClient(supabaseUrl, supabaseAnonKey)

Set Up Pinia

Update src/main.ts:

import { createApp } from 'vue'
import { createPinia } from 'pinia'
import App from './App.vue'

const app = createApp(App)
app.use(createPinia())
app.mount('#app')

Authentication Store

Create a Pinia store for authentication:

// src/stores/auth.ts
import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import { supabase } from '@/lib/supabase'
import type { User, Session } from '@supabase/supabase-js'

export const useAuthStore = defineStore('auth', () => {
  const user = ref<User | null>(null)
  const session = ref<Session | null>(null)
  const loading = ref(true)

  const isAuthenticated = computed(() => !!user.value)

  async function initialize() {
    try {
      const { data: { session: currentSession } } = await supabase.auth.getSession()
      session.value = currentSession
      user.value = currentSession?.user ?? null

      supabase.auth.onAuthStateChange((_event, newSession) => {
        session.value = newSession
        user.value = newSession?.user ?? null
      })
    } finally {
      loading.value = false
    }
  }

  async function signIn(email: string, password: string) {
    const { error } = await supabase.auth.signInWithPassword({ email, password })
    if (error) throw error
  }

  async function signUp(email: string, password: string) {
    const { error } = await supabase.auth.signUp({ email, password })
    if (error) throw error
  }

  async function signOut() {
    const { error } = await supabase.auth.signOut()
    if (error) throw error
  }

  return {
    user,
    session,
    loading,
    isAuthenticated,
    initialize,
    signIn,
    signUp,
    signOut,
  }
})

Create an authentication component:

<!-- src/components/Auth.vue -->
<script setup lang="ts">
import { ref } from 'vue'
import { useAuthStore } from '@/stores/auth'

const authStore = useAuthStore()
const email = ref('')
const password = ref('')
const loading = ref(false)
const error = ref<string | null>(null)

const handleSignIn = async () => {
  try {
    loading.value = true
    error.value = null
    await authStore.signIn(email.value, password.value)
  } catch (err: any) {
    error.value = err.message
  } finally {
    loading.value = false
  }
}

const handleSignUp = async () => {
  try {
    loading.value = true
    error.value = null
    await authStore.signUp(email.value, password.value)
    alert('Check your email for the confirmation link!')
  } catch (err: any) {
    error.value = err.message
  } finally {
    loading.value = false
  }
}
</script>

<template>
  <div class="max-w-md mx-auto mt-8 p-6 bg-white rounded-lg shadow">
    <h1 class="text-2xl font-bold mb-6">Welcome</h1>
    
    <div v-if="error" class="mb-4 p-3 bg-red-100 text-red-700 rounded">
      {{ error }}
    </div>

    <form @submit.prevent class="space-y-4">
      <div>
        <label for="email" class="block text-sm font-medium mb-1">Email</label>
        <input
          id="email"
          v-model="email"
          type="email"
          class="w-full px-3 py-2 border rounded-lg"
          required
        />
      </div>
      
      <div>
        <label for="password" class="block text-sm font-medium mb-1">Password</label>
        <input
          id="password"
          v-model="password"
          type="password"
          class="w-full px-3 py-2 border rounded-lg"
          required
        />
      </div>
      
      <div class="flex gap-2">
        <button
          type="button"
          @click="handleSignIn"
          :disabled="loading"
          class="flex-1 px-4 py-2 bg-blue-500 text-white rounded-lg disabled:opacity-50"
        >
          Sign In
        </button>
        <button
          type="button"
          @click="handleSignUp"
          :disabled="loading"
          class="flex-1 px-4 py-2 bg-gray-200 rounded-lg disabled:opacity-50"
        >
          Sign Up
        </button>
      </div>
    </form>
  </div>
</template>

Database Operations

Fetching Data with Composables

Create a reusable composable:

// src/composables/useSupabase.ts
import { ref, onMounted, onUnmounted } from 'vue'
import { supabase } from '@/lib/supabase'
import type { RealtimeChannel } from '@supabase/supabase-js'

export function useSupabaseQuery<T>(table: string, select = '*') {
  const data = ref<T[]>([])
  const loading = ref(true)
  const error = ref<Error | null>(null)

  async function fetch() {
    try {
      loading.value = true
      const { data: result, error: err } = await supabase
        .from(table)
        .select(select)

      if (err) throw err
      data.value = result || []
    } catch (err: any) {
      error.value = err
    } finally {
      loading.value = false
    }
  }

  onMounted(() => {
    fetch()
  })

  return { data, loading, error, refetch: fetch }
}

export function useSupabaseRealtime<T>(table: string, select = '*') {
  const data = ref<T[]>([])
  const loading = ref(true)
  const error = ref<Error | null>(null)
  let channel: RealtimeChannel | null = null

  async function fetch() {
    try {
      loading.value = true
      const { data: result, error: err } = await supabase
        .from(table)
        .select(select)

      if (err) throw err
      data.value = result || []
    } catch (err: any) {
      error.value = err
    } finally {
      loading.value = false
    }
  }

  onMounted(async () => {
    await fetch()

    // Subscribe to real-time changes
    channel = supabase
      .channel(`${table}_changes`)
      .on(
        'postgres_changes',
        { event: 'INSERT', schema: 'public', table },
        (payload) => {
          data.value = [payload.new as T, ...data.value]
        }
      )
      .on(
        'postgres_changes',
        { event: 'DELETE', schema: 'public', table },
        (payload) => {
          data.value = data.value.filter((item: any) => item.id !== payload.old.id)
        }
      )
      .on(
        'postgres_changes',
        { event: 'UPDATE', schema: 'public', table },
        (payload) => {
          data.value = data.value.map((item: any) =>
            item.id === payload.new.id ? (payload.new as T) : item
          )
        }
      )
      .subscribe()
  })

  onUnmounted(() => {
    if (channel) {
      supabase.removeChannel(channel)
    }
  })

  return { data, loading, error, refetch: fetch }
}

Using the Composable

<!-- src/components/Posts.vue -->
<script setup lang="ts">
import { useSupabaseRealtime } from '@/composables/useSupabase'

interface Post {
  id: string
  title: string
  content: string
  created_at: string
}

const { data: posts, loading } = useSupabaseRealtime<Post>('posts')
</script>

<template>
  <div class="space-y-4">
    <h2 class="text-2xl font-bold">Posts</h2>
    
    <div v-if="loading" class="text-center py-8">
      Loading...
    </div>
    
    <div v-else-if="posts.length === 0" class="text-center py-8 text-gray-500">
      No posts yet
    </div>
    
    <div v-else class="space-y-4">
      <div
        v-for="post in posts"
        :key="post.id"
        class="p-4 border rounded-lg"
      >
        <h3 class="text-xl font-bold">{{ post.title }}</h3>
        <p class="text-gray-600 mt-2">{{ post.content }}</p>
        <p class="text-sm text-gray-400 mt-2">
          {{ new Date(post.created_at).toLocaleDateString() }}
        </p>
      </div>
    </div>
  </div>
</template>

Create Form Component

<!-- src/components/CreatePost.vue -->
<script setup lang="ts">
import { ref } from 'vue'
import { supabase } from '@/lib/supabase'

const title = ref('')
const content = ref('')
const loading = ref(false)
const error = ref<string | null>(null)

const handleSubmit = async () => {
  try {
    loading.value = true
    error.value = null

    const { error: err } = await supabase
      .from('posts')
      .insert({ title: title.value, content: content.value })

    if (err) throw err

    title.value = ''
    content.value = ''
    alert('Post created successfully!')
  } catch (err: any) {
    error.value = err.message
  } finally {
    loading.value = false
  }
}
</script>

<template>
  <div class="max-w-2xl mx-auto">
    <h2 class="text-2xl font-bold mb-4">Create Post</h2>
    
    <div v-if="error" class="mb-4 p-3 bg-red-100 text-red-700 rounded">
      {{ error }}
    </div>

    <form @submit.prevent="handleSubmit" class="space-y-4">
      <div>
        <label for="title" class="block text-sm font-medium mb-1">Title</label>
        <input
          id="title"
          v-model="title"
          type="text"
          class="w-full px-3 py-2 border rounded-lg"
          required
        />
      </div>
      
      <div>
        <label for="content" class="block text-sm font-medium mb-1">Content</label>
        <textarea
          id="content"
          v-model="content"
          class="w-full px-3 py-2 border rounded-lg"
          rows="4"
          required
        />
      </div>
      
      <button
        type="submit"
        :disabled="loading"
        class="px-4 py-2 bg-blue-500 text-white rounded-lg disabled:opacity-50"
      >
        {{ loading ? 'Creating...' : 'Create Post' }}
      </button>
    </form>
  </div>
</template>

File Upload

<!-- src/components/FileUpload.vue -->
<script setup lang="ts">
import { ref } from 'vue'
import { supabase } from '@/lib/supabase'

const uploading = ref(false)
const fileUrl = ref<string | null>(null)

const uploadFile = async (event: Event) => {
  try {
    uploading.value = true

    const target = event.target as HTMLInputElement
    if (!target.files || target.files.length === 0) {
      throw new Error('You must select a file to upload.')
    }

    const file = target.files[0]
    const fileExt = file.name.split('.').pop()
    const fileName = `${Math.random()}.${fileExt}`
    const filePath = `uploads/${fileName}`

    const { error: uploadError } = await supabase.storage
      .from('files')
      .upload(filePath, file)

    if (uploadError) throw uploadError

    const { data } = supabase.storage.from('files').getPublicUrl(filePath)
    fileUrl.value = data.publicUrl
  } catch (error: any) {
    alert(error.message)
  } finally {
    uploading.value = false
  }
}
</script>

<template>
  <div class="space-y-4">
    <div>
      <label class="block text-sm font-medium mb-1">Upload File</label>
      <input
        type="file"
        @change="uploadFile"
        :disabled="uploading"
        class="block w-full"
      />
    </div>
    
    <div v-if="uploading" class="text-gray-600">
      Uploading...
    </div>
    
    <div v-if="fileUrl" class="space-y-2">
      <p class="text-green-600">File uploaded successfully!</p>
      <a
        :href="fileUrl"
        target="_blank"
        rel="noopener noreferrer"
        class="text-blue-500 underline"
      >
        View file
      </a>
    </div>
  </div>
</template>

Main App Structure

<!-- src/App.vue -->
<script setup lang="ts">
import { onMounted } from 'vue'
import { useAuthStore } from '@/stores/auth'
import Auth from '@/components/Auth.vue'
import Dashboard from '@/components/Dashboard.vue'

const authStore = useAuthStore()

onMounted(() => {
  authStore.initialize()
})
</script>

<template>
  <div v-if="authStore.loading" class="flex items-center justify-center h-screen">
    Loading...
  </div>
  
  <div v-else-if="!authStore.isAuthenticated">
    <Auth />
  </div>
  
  <div v-else>
    <nav class="bg-white shadow px-4 py-3 flex justify-between items-center">
      <h1 class="text-xl font-bold">My App</h1>
      <button
        @click="authStore.signOut"
        class="px-4 py-2 bg-red-500 text-white rounded"
      >
        Sign Out
      </button>
    </nav>
    
    <main class="container mx-auto p-4">
      <Dashboard />
    </main>
  </div>
</template>

Best Practices

Composition API

Use composables for reusable Supabase logic.

Pinia for State

Manage authentication and global state with Pinia.

Type Safety

Use TypeScript for type-safe database operations.

Reactive Data

Leverage Vue’s reactivity for real-time updates.

Lifecycle Hooks

Clean up subscriptions in onUnmounted.

Next Steps

Todo App Tutorial

Build a complete application

User Management

Add user profiles

File Uploads

Handle file storage

Examples

Explore more examples

Tutorials

Integration Guides

Examples

Vue Integration Guide

Why Vue + Supabase?

Quick Start

Authentication Store

Database Operations

Fetching Data with Composables

Using the Composable

Create Form Component

File Upload

Main App Structure

Best Practices

Composition API

Pinia for State

Type Safety

Reactive Data

Lifecycle Hooks

Next Steps

Todo App Tutorial

User Management

File Uploads

Examples

​Why Vue + Supabase?

​Quick Start

​Authentication Store

​Login Component

​Database Operations

​Fetching Data with Composables

​Using the Composable

​Create Form Component

​File Upload

​Main App Structure

​Best Practices

Composition API

Pinia for State

Type Safety

Reactive Data

Lifecycle Hooks

​Next Steps

Todo App Tutorial

User Management

File Uploads

Examples

Why Vue + Supabase?

Quick Start

Authentication Store

Login Component

Database Operations

Fetching Data with Composables

Using the Composable

Create Form Component

File Upload

Main App Structure

Best Practices

Next Steps