Build a User Management App with Svelte

This tutorial demonstrates how to build a basic user management app. The app authenticates and identifies the user, stores their profile information in the database, and allows the user to log in, update their profile details, and upload a profile photo. The app uses:

Supabase Database - a Postgres database for storing your user data and Row Level Security so data is protected and users can only access their own information.
Supabase Auth - allow users to sign up and log in.
Supabase Storage - users can upload a profile photo.

Supabase User Management example

If you get stuck while working through this guide, refer to the full example on GitHub.

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

Create a new project in the Supabase Dashboard.
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.

Go to the SQL Editor page in the Dashboard.
Click User Management Starter.
Click Run.

You can pull the database schema down to your local project by running the db pull command. Read the local development docs for detailed instructions.

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supabase link --project-ref <project-id># You can get <project-id> from your project's dashboard URL: https://supabase.com/dashboard/project/<project-id>supabase db pull

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 Project URL and anon key from the API settings.

Go to the API Settings page in the Dashboard.
Find your Project URL, anon, and service_role keys on this page.

Building the app

Let's start building the Svelte app from scratch.

Initialize a Svelte app

We can use the Vite Svelte TypeScript Template to initialize an app called supabase-svelte:

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npm create vite@latest supabase-svelte -- --template svelte-tscd supabase-sveltenpm install

Then let's install the only additional dependency: supabase-js

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npm install @supabase/supabase-js

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.

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VITE_SUPABASE_URL=YOUR_SUPABASE_URLVITE_SUPABASE_ANON_KEY=YOUR_SUPABASE_ANON_KEY

Now that we have the API credentials in place, let's create a helper file to initialize the Supabase client. These variables will be exposed on the browser, and that's completely fine since we have Row Level Security enabled on our Database.

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import { createClient } from '@supabase/supabase-js'const supabaseUrl = import.meta.env.VITE_SUPABASE_URLconst supabaseAnonKey = import.meta.env.VITE_SUPABASE_ANON_KEYexport const supabase = createClient(supabaseUrl, supabaseAnonKey)

App styling (optional)

An optional step is to update the CSS file src/app.css to make the app look nice. You can find the full contents of this file here.

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

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<script lang="ts">  import { supabase } from '../supabaseClient'  let loading = false  let email = ''  const handleLogin = async () => {    try {      loading = true      const { error } = await supabase.auth.signInWithOtp({ email })      if (error) throw error      alert('Check your email for login link!')    } catch (error) {      if (error instanceof Error) {        alert(error.message)      }    } finally {      loading = false    }  }</script><div class="row flex-center flex">  <div class="col-6 form-widget" aria-live="polite">    <h1 class="header">Supabase + Svelte</h1>    <p class="description">Sign in via magic link with your email below</p>    <form class="form-widget" on:submit|preventDefault="{handleLogin}">      <div>        <label for="email">Email</label>        <input          id="email"          class="inputField"          type="email"          placeholder="Your email"          bind:value="{email}"        />      </div>      <div>        <button type="submit" class="button block" aria-live="polite" disabled="{loading}">          <span>{loading ? 'Loading' : 'Send magic link'}</span>        </button>      </div>    </form>  </div></div>

Account page

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.svelte.

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<script lang="ts">  import { onMount } from 'svelte'  import type { AuthSession } from '@supabase/supabase-js'  import { supabase } from '../supabaseClient'  export let session: AuthSession  let loading = false  let username: string | null = null  let website: string | null = null  let avatarUrl: string | null = null  onMount(() => {    getProfile()  })  const getProfile = async () => {    try {      loading = true      const { user } = session      const { data, error, status } = await supabase        .from('profiles')        .select('username, website, avatar_url')        .eq('id', user.id)        .single()      if (error && status !== 406) throw error      if (data) {        username = data.username        website = data.website        avatarUrl = data.avatar_url      }    } catch (error) {      if (error instanceof Error) {        alert(error.message)      }    } finally {      loading = false    }  }  const updateProfile = async () => {    try {      loading = true      const { user } = session      const updates = {        id: user.id,        username,        website,        avatar_url: avatarUrl,        updated_at: new Date().toISOString(),      }      const { error } = await supabase.from('profiles').upsert(updates)      if (error) {        throw error      }    } catch (error) {      if (error instanceof Error) {        alert(error.message)      }    } finally {      loading = false    }  }</script><form on:submit|preventDefault="{updateProfile}" class="form-widget">  <div>Email: {session.user.email}</div>  <div>    <label for="username">Name</label>    <input id="username" type="text" bind:value="{username}" />  </div>  <div>    <label for="website">Website</label>    <input id="website" type="text" bind:value="{website}" />  </div>  <div>    <button type="submit" class="button primary block" disabled="{loading}">      {loading ? 'Saving ...' : 'Update profile'}    </button>  </div>  <button type="button" class="button block" on:click={() => supabase.auth.signOut()}> Sign Out  </button></form>

Launch!

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

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<script lang="ts">  import { onMount } from 'svelte'  import { supabase } from './supabaseClient'  import type { AuthSession } from '@supabase/supabase-js'  import Account from './lib/Account.svelte'  import Auth from './lib/Auth.svelte'  let session: AuthSession | null  onMount(() => {    supabase.auth.getSession().then(({ data }) => {      session = data.session    })    supabase.auth.onAuthStateChange((_event, _session) => {      session = _session    })  })</script><div class="container" style="padding: 50px 0 100px 0">  {#if !session}  <Auth />  {:else}  <Account {session} />  {/if}</div>

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

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npm run dev

And then open the browser to localhost:5173 and you should see the completed app.

Svelte uses Vite and the default port is 5173, Supabase uses port 3000. To change the redirection port for Supabase go to: Authentication > Settings and change the Site Url to http://localhost:5173/

Supabase Svelte

Bonus: Profile photos

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

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

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<script lang="ts">  import { createEventDispatcher } from 'svelte'  import { supabase } from '../supabaseClient'  export let size: number  export let url: string | null = null  let avatarUrl: string | null = null  let uploading = false  let files: FileList  const dispatch = createEventDispatcher()  const downloadImage = async (path: string) => {    try {      const { data, error } = await supabase.storage.from('avatars').download(path)      if (error) {        throw error      }      const url = URL.createObjectURL(data)      avatarUrl = url    } catch (error) {      if (error instanceof Error) {        console.log('Error downloading image: ', error.message)      }    }  }  const uploadAvatar = async () => {    try {      uploading = true      if (!files || files.length === 0) {        throw new Error('You must select an image to upload.')      }      const file = files[0]      const fileExt = file.name.split('.').pop()      const filePath = `${Math.random()}.${fileExt}`      const { error } = await supabase.storage.from('avatars').upload(filePath, file)      if (error) {        throw error      }      url = filePath      dispatch('upload')    } catch (error) {      if (error instanceof Error) {        alert(error.message)      }    } finally {      uploading = false    }  }  $: if (url) downloadImage(url)</script><div style="width: {size}px" aria-live="polite">  {#if avatarUrl} <img src={avatarUrl} alt={avatarUrl ? 'Avatar' : 'No image'} class="avatar image"  style="height: {size}px, width: {size}px" /> {:else}  <div class="avatar no-image" style="height: {size}px, width: {size}px" />  {/if}  <div style="width: {size}px">    <label class="button primary block" for="single">      {uploading ? 'Uploading ...' : 'Upload avatar'}    </label>    <span style="display:none">      <input        type="file"        id="single"        accept="image/*"        bind:files        on:change={uploadAvatar}        disabled={uploading}      />    </span>  </div></div>

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

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<script lang="ts">  // Import the new component  import Avatar from './Avatar.svelte'</script><form on:submit|preventDefault="{updateProfile}" class="form-widget">  <!-- Add to body -->  <Avatar bind:url="{avatarUrl}" size="{150}" on:upload="{updateProfile}" />  <!-- Other form elements --></form>

At this stage you have a fully functional application!

Build a User Management App with Svelte

Project setup

Create a project

Set up the database schema

Get the API keys

Building the app

Initialize a Svelte app

App styling (optional)

Account page

Launch!

Bonus: Profile photos

Create an upload widget

Add the new widget

Is this helpful?

Build a User Management App with Svelte

Project setup#

Create a project#

Set up the database schema#

Get the API keys#

Building the app#

Initialize a Svelte app#

App styling (optional)#

Set up a login component#

Account page#

Launch!#

Bonus: Profile photos#

Create an upload widget#

Add the new widget#

Is this helpful?

Project setup

Create a project

Set up the database schema

Get the API keys

Building the app

Initialize a Svelte app

App styling (optional)

Set up a login component

Account page

Launch!

Bonus: Profile photos

Create an upload widget

Add the new widget