How to Protect Supabase Service Role Key in Next.js & Client Apps
Secure Supabase Admin Proxy at the Edge
The Supabase service_role key bypasses all Row Level Security (RLS) rules. If leaked, an attacker has unrestricted admin access to your database. RealComposer keeps your service role key in the Secret Vault and exposes locked-down endpoints with strict output filtering.
Service Role Keys Bypass All Database Security
Accidentally importing a service_role key into client components gives users full database permissions.
- Complete database exfiltration
- Bypassing Row Level Security (RLS)
- Malicious record updates
How RealComposer Solves This at the Edge
Keep Service Role Key in Vault
Store SUPABASE_SERVICE_ROLE_KEY in RealComposer.
Project Only Safe Fields
Strip sensitive columns like password_hash or internal audit fields.
[
{
"id": "u_1",
"email": "user@example.com",
"role": "admin",
"password_hash": "$2b$12$...",
"ssn_last4": "1234"
}
]
{
"userId": "u_1",
"email": "user@example.com",
"role": "admin"
}
curl -X GET "https://realcomposer.com/v1/acme/user-admin-view?userId=u_1"
Developer Questions & Troubleshooting
Why use RealComposer instead of Supabase Edge Functions?
RealComposer requires zero code or Deno deployments and provides visual field trimming.
Deploy this Next.js / React + Supabase Recipe
Clone this pre-configured pipeline into your RealComposer workspace in one click. We pre-populate upstream URLs, headers, and mapping rules.