Use Supabase with Nuxt

Help me add Supabase to my Nuxt project. Create a Supabase project at
database.new and run the instruments table SQL. Then:
1. Run `npx nuxi@latest init my-app` to scaffold the app.
2. Run `npm install @supabase/supabase-js`.
3. Create `.env` with `SUPABASE_URL` and `SUPABASE_PUBLISHABLE_KEY` and expose
   them via `nuxt.config.ts` runtimeConfig.
4. Update `app.vue` to create a Supabase client and fetch and display the
   instruments table on mount.
5. Run `npm run dev` and open http://localhost:3000.

REFERENCE
https://supabase.com/docs/guides/getting-started/quickstarts/nuxtjs.md

1. Create a Supabase project

To start, you need a Supabase project.

Create a new Supabase project from the Dashboard of any organization you belong to.

2. Set up your database

When your Supabase project is up and running, create an instruments table with some sample data. Then set only the privileges each Postgres role needs, add Row Level Security (RLS) for enhanced security for database data by default, and create an RLS policy to make the data in the table publicly readable.

Do these steps within your project's dashboard by copying and running the snippet in your project's SQL Editor.

-- Create the table
create table instruments (
  id bigint primary key generated always as identity,
  name text not null
);

-- Insert sample data into the table
insert into instruments (name)
values
  ('violin'),
  ('viola'),
  ('cello');

-- Grant the privileges the role needs, which is read access
grant select on public.instruments to anon;

-- Enable row level security for the table
alter table instruments enable row level security;

-- Create a policy to allow the anon role to read from the instruments table
create policy "public can read instruments"
on public.instruments
for select to anon
using (true);

3. Create a Nuxt app

Create a Nuxt app using the npx nuxi command.

npx nuxi@latest init my-app

npx nuxi@latest init my-app --template minimal --no-gitInit --packageManager npm

4. Set up AI tooling (optional)

Supabase provides two ways to give AI tools context about your project: Agent Skills, which give your AI coding agent procedural knowledge, and the MCP server, which connects AI assistants to your Supabase project directly.

Agent Skills

Agent Skills is a curated set of instructions that give your AI agent procedural knowledge about working with Supabase.

Install them so your AI coding agent can produce more accurate, reliable code using current Supabase patterns, such as authentication, server-side rendering, and database migrations, rather than relying solely on training data.

Installing Agent Skills

To install, run the following command in the root of your project:

npx skills add supabase/agent-skills

Supabase MCP server

The Supabase MCP server connects AI assistants to Supabase, so they can inspect your schema and act on your projects on your behalf. Find out how to add it to your client in the MCP docs.

5. 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 Nuxt app.

Navigate to the Nuxt app and install supabase-js.

cd my-app && npm install @supabase/supabase-js

6. Declare Supabase environment variables

Create a .env file and populate with your Supabase connection variables that you can get from the helper below, or from the project Connect panel:

SUPABASE_URL=<SUBSTITUTE_SUPABASE_URL>
SUPABASE_PUBLISHABLE_KEY=<SUBSTITUTE_SUPABASE_PUBLISHABLE_KEY>

export default defineNuxtConfig({
  runtimeConfig: {
    public: {
      supabaseUrl: process.env.SUPABASE_URL,
      supabasePublishableKey: process.env.SUPABASE_PUBLISHABLE_KEY,
    },
  },
})

Get API details

To interact with data in database tables, you use the client libraries that wrap the auto-generated Data API endpoints, authenticating using the Project URL and key from the project Connect dialog.

Project URL: https://<project-ref>.supabase.co (find yours in the dashboard)

Publishable key: sb_publishable_... (find yours in the dashboard)

7. Create the Supabase client

Create a composable at app/composables/useSupabase.ts that builds the client from your config values. useRuntimeConfig() is only available inside a Nuxt context, such as a composable or a component's setup, so the client is created there rather than at the top level of a module. Nuxt auto-imports anything in app/composables/, so you don't need to import useSupabase where you use it.

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

export function useSupabase() {
  const config = useRuntimeConfig()
  return createClient(config.public.supabaseUrl, config.public.supabasePublishableKey)
}

8. Query data from the app

In app/app.vue, replace the existing content with the following code.

<script setup>
const supabase = useSupabase()
const instruments = ref([])
const error = ref(null)

async function getInstruments() {
  const { data, error: fetchError } = await supabase.from('instruments').select()

  if (fetchError) {
    error.value = fetchError
    return
  }

  instruments.value = data
}

onMounted(() => {
  getInstruments()
})
</script>

<template>
  <p v-if="error">Error loading instruments: {{ error.message }}</p>
  <ul v-else>
    <li v-for="instrument in instruments" :key="instrument.id">{{ instrument.name }}</li>
  </ul>
</template>

9. Start the app

Start the app, navigate to http://localhost:3000 in the browser, and you should see the list of instruments.

npm run dev

Production requirements

The quickstart procedure in this guide optimizes for getting you to a working app, not for production.

Before you deploy:

• If your app reads or writes through the Data API, review your Row Level Security policies. Any policy you added here is scoped to this quickstart's sample data, not to real user data.
• Set your Supabase credentials as environment variables on whatever platform you deploy to, rather than committing them to source control.
• Configure a custom domain for your Supabase project once you're ready to go live.

Next steps

• Set up Auth for your app
• Insert more data into your database
• Upload and serve static files using Storage
• Explore drop-in UI components for your Supabase app