Field Guide
Use Supabase to Make Websites Feel Alive
Add real data without turning a small website into a heavy system.
A beginner guide to using Supabase for tables, Row Level Security, anonymous feedback, client reads and writes, and safe fallbacks.
Steps from the workbench
Choose one useful interaction
Pick a small data-backed feature such as feedback, waitlist signups, comments, saved prompts, or guide progress.
What to check
The database feature has a clear purpose and does not require user accounts for the first version.
Design the table around the workflow
Keep columns plain and validate lengths, allowed values, and required fields in the database.
What to check
The table can reject malformed rows even if a client-side check is bypassed.
Turn on Row Level Security
RLS should be enabled before public clients use the table. Policies should describe exactly who can read, insert, or update.
What to check
Anonymous visitors can only do the actions the public UI truly needs.
Use the public key carefully
Supabase publishable or anon keys are meant for browser use, but they are only safe when RLS policies are correct.
What to check
No service role key or private secret is exposed to the browser.
Keep the site demoable
For simple public experiments, consider a local fallback so the UI still works before Supabase is connected.
What to check
The feature degrades clearly when environment variables are missing.
Prompts to adapt
Design a safe table
Design a Supabase table for [feature]. Include columns, constraints, indexes, and RLS policies for anonymous public use. Explain what each policy allows and what it blocks.
Audit RLS
Review these Supabase policies for accidental public writes, overbroad reads, missing validation, and abuse risk. Suggest safer policies for a public website.