Supabase Hello World — First Query

Overview

Execute your first real Supabase query: create a todos table in the dashboard, insert a row with the JS client, and read it back. This validates that your project URL, anon key, and Row Level Security are configured correctly before you build anything else.

Prerequisites

• Completed supabase-install-auth setup (project URL + anon key in .env)
• @supabase/supabase-js v2+ installed (npm install @supabase/supabase-js)
• A Supabase project at supabase.com/dashboard

Instructions

The workflow is three steps: create the table (dashboard SQL), insert a row with the JS client, and read it back to prove the round-trip. The skeleton below is enough to follow along; the fully annotated code for every step — including the error-branch comments and expected console output — lives in the full implementation walkthrough.