Supabase and Nuxt 3 Quickstart Guide

This example provides the steps to build a simple user management app (from scratch!) using Supabase and Nuxt 3.

Rory Wilding

Jul. 30, 22 · Tutorial

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This example provides the steps to build a simple user management app (from scratch!) using Supabase and Svelte. It includes:

Supabase Database: a Postgres database for storing your user data.
Supabase Auth: users can sign in with magic links (no passwords, only email).
Supabase Storage: users can upload a photo.
Row Level Security: data is protected so that individuals can only access their own data.
Instant APIs: APIs will be automatically generated when you create your database tables.

By the end of this guide you'll have an app that allows users to log in and update some basic profile details:

GitHub

Whenever you get stuck at any point, take a look at this repo.

Project Setup

Before we start building we're going to set up our database and API. This is as simple as starting a new project in Supabase and then creating a "schema" inside the database.

Create a Project

Go to app.supabase.com.
Click on "New Project".
Enter your project details.
Wait for the new database to launch.

Set Up the Database Schema

Now we are going to set up the database schema. We can use the "User Management Starter" quickstart in the SQL editor, or you can just copy/paste the SQL from below and run it yourself.

1. Go to the "SQL Editor" section.
2. Click "User Management Starter".
3. Click "Run".

      SQL
     
 

     -- Create a table for public "profiles"
create table profiles (
  id uuid references auth.users not null,
  updated_at timestamp with time zone,
  username text unique,
  avatar_url text,
  website text,

  primary key (id),
  unique(username),
  constraint username_length check (char_length(username) >= 3)
);

alter table profiles enable row level security;

create policy "Public profiles are viewable by everyone."
  on profiles for select
  using ( true );

create policy "Users can insert their own profile."
  on profiles for insert
  with check ( auth.uid() = id );

create policy "Users can update own profile."
  on profiles for update
  using ( auth.uid() = id );

-- Set up Realtime!
begin;
  drop publication if exists supabase_realtime;
  create publication supabase_realtime;
commit;
alter publication supabase_realtime add table profiles;

-- Set up Storage!
insert into storage.buckets (id, name)
values ('avatars', 'avatars');

create policy "Avatar images are publicly accessible."
  on storage.objects for select
  using ( bucket_id = 'avatars' );

create policy "Anyone can upload an avatar."
  on storage.objects for insert
  with check ( bucket_id = 'avatars' );

    

Get the API Keys

Now that you've created some database tables, you are ready to insert data using the auto-generated API. We just need to get the URL and anon key from the API settings.

1. Go to the "Settings" section.
2. Click "API" in the sidebar.
3. Find your API URL in this page.4. Find your "anon" and "service_role" keys on this page.

Building the App

Let's start building the Vue 3 app from scratch.

Initialize a Nuxt 3 app

We can use nuxi init to create an app called nuxt-user-management:

      Shell
     
     npx nuxi init nuxt-user-management

cd nuxt-user-management

Then let's install the only additional dependency: NuxtSupabase. We only need to import NuxtSupabase as a dev dependency.

      Shell
     
     npm install @nuxtjs/supabase --save-dev

And finally we want to save the environment variables in a .env. All we need are the API URL and the anon key that you copied earlier.

      HTML
     
     .env

SUPABASE_URL="YOUR_SUPABASE_URL"
SUPABASE_KEY="YOUR_SUPABASE_ANON_KEY"

These variables will be exposed on the browser, and that's completely fine since we have Row-Level Security enabled on our Database. The amazing thing about NuxtSupabase is that setting environment variables is all we need to do in order to start using Supabase. No need to initialize Supabase. The library will take care of it automatically.

And one optional step is to update the CSS file assets/main.css to make the app look nice. You can find the full contents of this file here.

      TypeScript
     
     nuxt.config.ts

import { defineNuxtConfig } from 'nuxt'

// https://v3.nuxtjs.org/api/configuration/nuxt.config
export default defineNuxtConfig({
  modules: ['@nuxtjs/supabase'],
  css: ['@/assets/main.css'],
})

Set up Auth Component

Let's set up a Vue component to manage logins and sign-ups. We'll use Magic Links, so users can sign in with their email without using passwords.

      HTML
     
 

     /components/Auth.vue

<template>
    <form class="row flex flex-center" @submit.prevent="handleLogin">
        <div class="col-6 form-widget">
            <h1 class="header">Supabase + Vue 3</h1>
            <p class="description">Sign in via magic link with your email below</p>
            <div>
                <input class="inputField" type="email" placeholder="Your email" v-model="email" />
            </div>
            <div>
                <input type="submit" class="button block" :value="loading ? 'Loading' : 'Send magic link'"
                    :disabled="loading" />
            </div>
        </div>
    </form>
</template>

<script setup>
const supabase = useSupabaseClient()

const loading = ref(false)
const email = ref("")
const handleLogin = async () => {
    try {
        loading.value = true
        const { error } = await supabase.auth.signIn({ email: email.value })
        if (error) throw error
        alert("Check your email for the login link!")
    } catch (error) {
        alert(error.error_description || error.message)
    } finally {
        loading.value = false
    }
}
</script>
    

User State

To access the user information in other places, will create a user state. Create a new file called states.ts and utilize useState method of Nuxt 3.

      TypeScript
     
     composables/states.ts

export const useUser = () => useState('user', () => null)

Account Component

After a user is signed in we can allow them to edit their profile details and manage their account. Let's create a new component for that called Account.vue.

      HTML
     
 

     components/Account.vue

<template>
    <form class="form-widget" @submit.prevent="updateProfile">
        <div>
            <label for="email">Email</label>
            <input id="email" type="text" :value="user.email" disabled />
        </div>
        <div>
            <label for="username">Name</label>
            <input id="username" type="text" v-model="username" />
        </div>
        <div>
            <label for="website">Website</label>
            <input id="website" type="website" v-model="website" />
        </div>

        <div>
            <input type="submit" class="button block primary" :value="loading ? 'Loading ...' : 'Update'"
                :disabled="loading" />
        </div>

        <div>
            <button class="button block" @click="signOut" :disabled="loading">
                Sign Out
            </button>
        </div>
    </form>
</template>

<script setup>
const supabase = useSupabaseClient()

const loading = ref(true)
const username = ref('')
const website = ref('')
const avatar_path = ref('')


loading.value = true
const user = useUser();
let { data } = await supabase
    .from('profiles')
    .select(`username, website, avatar_url`)
    .eq('id', user.value.id)
    .single()
if (data) {
    username.value = data.username
    website.value = data.website
    avatar_path.value = data.avatar_url
}
loading.value = false

async function updateProfile() {
    try {
        loading.value = true
        const user = useUser();
        const updates = {
            id: user.value.id,
            username: username.value,
            website: website.value,
            avatar_url: avatar_path.value,
            updated_at: new Date(),
        }
        let { error } = await supabase.from('profiles').upsert(updates, {
            returning: 'minimal', // Don't return the value after inserting
        })
        if (error) throw error
    } catch (error) {
        alert(error.message)
    } finally {
        loading.value = false
    }
}

async function signOut() {
    try {
        loading.value = true
        let { error } = await supabase.auth.signOut()
        if (error) throw error
    } catch (error) {
        alert(error.message)
    } finally {
        loading.value = false
    }
}
</script>
    

Launch!

Now that we have all the components in place, let's update app.vue:

      HTML
     
     app.vue

<template>
  <div>
    <NuxtPage />
  </div>
</template>

Once that's done, run this in a terminal window:

      Shell
     
     npm run dev

And then open the browser to localhost:3000 and you should see the completed app.

Bonus: Profile Photos

Every Supabase project is configured with Storage for managing large files like photos and videos.

Create an Upload Widget

Let's create an avatar for the user so that they can upload a profile photo. We can start by creating a new component:

      HTML
     
 

     components/Avatar.vue

<template>
    <div>
        <img v-if="src" :src="src" alt="Avatar" class="avatar image" style="width: 10em; height: 10em;" />
        <div v-else class="avatar no-image" :style="{ height: size, width: size }" />

        <div style="width: 10em; position: relative;">
            <label class="button primary block" for="single">
                {{ uploading ? "Uploading ..." : "Upload" }}
            </label>
            <input style="position: absolute; visibility: hidden;" type="file" id="single" accept="image/*"
                @change="uploadAvatar" :disabled="uploading" />
        </div>
    </div>
</template>

<script setup>
const props = defineProps(['path'])
const { path } = toRefs(props)

const emit = defineEmits(['update:path', 'upload'])

const supabase = useSupabaseClient()

const uploading = ref(false)
const src = ref("")
const files = ref()
const downloadImage = async () => {
    try {
        const { data, error } = await supabase.storage
            .from("avatars")
            .download(path.value)
        if (error) throw error
        src.value = URL.createObjectURL(data)
    } catch (error) {
        console.error("Error downloading image: ", error.message)
    }
}

const uploadAvatar = async (evt) => {
    files.value = evt.target.files
    try {
        uploading.value = true
        if (!files.value || files.value.length === 0) {
            throw new Error("You must select an image to upload.")
        }
        const file = files.value[0]
        const fileExt = file.name.split(".").pop()
        const fileName = `${Math.random()}.${fileExt}`
        const filePath = `${fileName}`
        let { error: uploadError } = await supabase.storage
            .from("avatars")
            .upload(filePath, file)
        if (uploadError) throw uploadError
        emit("update:path", filePath)
        emit("upload")
    } catch (error) {
        alert(error.message)
    } finally {
        uploading.value = false
    }
}

downloadImage()

watch(path, () => {
    if (path.value) {
        downloadImage()
    }
})
</script>
    

Add the New Widget

And then we can add the widget to the Account page:

      HTML
     
 

     components/Account.vue

<template>
    <form class="form-widget" @submit.prevent="updateProfile">
        <Avatar v-model:path="avatar_path" @upload="updateProfile" />
        <div>
            <label for="email">Email</label>
            <input id="email" type="text" :value="user.email" disabled />
        </div>
        <div>
            <label for="username">Name</label>
            <input id="username" type="text" v-model="username" />
        </div>
        <div>
            <label for="website">Website</label>
            <input id="website" type="website" v-model="website" />
        </div>

        <div>
            <input type="submit" class="button block primary" :value="loading ? 'Loading ...' : 'Update'"
                :disabled="loading" />
        </div>

        <div>
            <button class="button block" @click="signOut" :disabled="loading">
                Sign Out
            </button>
        </div>
    </form>
</template>

<script setup>
const supabase = useSupabaseClient()

const loading = ref(true)
const username = ref('')
const website = ref('')
const avatar_path = ref('')


loading.value = true
const user = useUser();
let { data } = await supabase
    .from('profiles')
    .select(`username, website, avatar_url`)
    .eq('id', user.value.id)
    .single()
if (data) {
    username.value = data.username
    website.value = data.website
    avatar_path.value = data.avatar_url
}
loading.value = false

async function updateProfile() {
    try {
        loading.value = true
        const user = useUser();
        const updates = {
            id: user.value.id,
            username: username.value,
            website: website.value,
            avatar_url: avatar_path.value,
            updated_at: new Date(),
        }
        let { error } = await supabase.from('profiles').upsert(updates, {
            returning: 'minimal', // Don't return the value after inserting
        })
        if (error) throw error
    } catch (error) {
        alert(error.message)
    } finally {
        loading.value = false
    }
}

async function signOut() {
    try {
        loading.value = true
        let { error } = await supabase.auth.signOut()
        if (error) throw error
    } catch (error) {
        alert(error.message)
    } finally {
        loading.value = false
    }
}
</script>
    

That is it! You should now be able to upload a profile photo to Supabase Storage.

Next Steps

At this stage, you have a fully functional application!

Got a question? Ask here.
Sign in: app.supabase.com

Database Profile (engineering)

Published at DZone with permission of Rory Wilding. See the original article here.

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