Use Supabase with SvelteKit

Learn how to create a Supabase project, add some sample data to your database, and query the data from a SvelteKit app.

Set up a Supabase project with sample data

Create a new project in the Supabase Dashboard.

After your project is ready, create a table in your Supabase database using the SQL Editor in the Dashboard. Use the following SQL statement to create a countries table with some sample data.

-- Create the table
CREATE TABLE countries (
 id SERIAL PRIMARY KEY,
 name VARCHAR(255) NOT NULL
);
-- Insert some sample data into the table
INSERT INTO countries (name) VALUES ('United States');
INSERT INTO countries (name) VALUES ('Canada');
INSERT INTO countries (name) VALUES ('Mexico');

Create a SvelteKit app

Create a SvelteKit app using the npm create command.

1npm create svelte@latest myapp

Install the Supabase client library

The fastest way to get started is to use the supabase-js client library which provides a convenient interface for working with Supabase from a SvelteKit app.

Navigate to the SvelteKit app and install supabase-js.

1cd myapp && npm install @supabase/supabase-js

Create the Supabase client

Create a /src/lib directory in your SvelteKit app, create a file called supabaseClient.js and add the following code to initialize the Supabase client with your project URL and public API (anon) key.

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

  export const supabase = createClient('https://<project>.supabase.co', '<your-anon-key>')

Query data from the app

Use load method to fetch the data server-side and display the query results as a simple list.

Create +page.server.js file in the routes directory with the following code.

  import { supabase } from "$lib/supabaseClient";

  export async function load() {
    const { data } = await supabase.from("countries").select();
    return {
      countries: data ?? [],
    };
  }

Replace the existing content in your +page.svelte file in the routes directory with the following code.

  <script>
    export let data;
    let { countries } = data;
    $: ({ countries } = data);
  </script>

  <ul>
    {#each countries as country}
      <li>{country.name}</li>
    {/each}
  </ul>

Start the app

Start the app and go to http://localhost:5173 in a browser and you should see the list of countries.

1npm run dev

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