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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchSupabase is deprecating its legacy anon and service_role API keys by the end of 2026. Their replacements are publishable keys for public clients and secret keys for trusted backends. Adding replacements does not revoke the old keys, so errors during migration usually come from a mismatched key location, missing authorization, or a permission/RLS issue—not simply from having both key types present.
A DEV Community listing credits Kavya with an article titled “I kept hitting Supabase errors, so I built a scanner for the legacy API key deprecation,” dated Sep 28 (the listing does not show a year). It establishes that a scanner article was published, but does not identify the scanner’s features, repository, or testing status. The practical steps below are based on Supabase’s migration guidance.
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Which Supabase key replaces each legacy key?
| Key | Intended location | Access and exposure |
|---|---|---|
Publishable (sb_publishable_...) |
Public clients, such as web or mobile apps | Maps to the low-privilege anon role for unauthenticated requests. It is suitable for public client code when your database access is protected appropriately by grants and RLS policies. |
Secret (sb_secret_...) |
Trusted, developer-controlled backends | Maps to service_role, has elevated access, and bypasses RLS. Keep it out of browsers, client bundles, user-distributed apps, and source control. |
Supabase says the publishable key carries the same low privileges as the legacy anon key, so existing Row Level Security policies behave the same. An authenticated user is still represented by that user’s Supabase Auth JWT; a publishable key does not make every request anonymous.
See Supabase’s migration guide and API-key guide for the current key behavior and project settings.
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Why do errors appear after changing a key?
The new key is being sent as a JWT
Publishable and secret keys are not JWTs. Send the key in the apikey header; do not treat it as a bearer token or assume that JWT validation authenticates it. This matters especially with Edge Functions: verify_jwt behavior alone does not replace application-level authorization when a caller presents only an API key. Check Supabase’s migration instructions for the current Edge Function setup.
A service-role client is using a user’s Authorization header
If a backend client configured with a secret key unexpectedly encounters RLS restrictions, inspect the request’s Authorization header as well as its apikey value. A user session or explicitly supplied user JWT can take precedence over the expected service-role authorization context. Confirm which identity the request actually sends before changing policies.
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A query returns no rows, or reports a permission error
These outcomes point to different checks. An empty result can mean that an RLS policy matches no rows. A missing Postgres grant can instead produce a permission error. Check the table privileges and the applicable RLS policies separately; changing API keys does not itself repair either condition.
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That is expected while migrating. Creating publishable and secret keys does not deactivate the legacy keys; Supabase supports a period when both are active. Legacy keys require a separate deactivation step once you have located and migrated their consumers.
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How to migrate without breaking deployed clients
- Create the replacements. In the project dashboard, open Settings > API Keys and create a publishable key and a secret key. They can coexist with the legacy keys during the transition.
- Replace public-client uses. Change the legacy
anonkey to the publishable key in web, mobile, desktop, CLI, or script code distributed to users. Keep access controls in place; a public key is not a substitute for RLS or database grants. - Replace backend uses. Change the legacy
service_rolekey to a secret key in trusted server-side components. Store it in secure configuration rather than source code or a client bundle, and review which requests are made with a user JWT versus the privileged server identity. - Update Edge Functions. Supabase documents
SUPABASE_PUBLISHABLE_KEYSandSUPABASE_SECRET_KEYSenvironment values containing JSON objects keyed by key name, alongside the older variables. A function can parse the relevant object and read the named key. Supabase describes both a minimal environment-variable approach and use of the@supabase/serverSDK, recommending the SDK for new functions. Whichever approach you use, send the new key inapikeyand implement the handler’s authorization explicitly. - Inventory every consumer before deactivation. Search deployed and stored configuration, including app versions already in users’ hands, CI/CD and deployment pipelines, third-party integrations, webhooks, cron jobs, workers,
pg_net, and Database Webhooks. Supabase does not provide an automatic indicator that finds every legacy-key consumer for you. - Deactivate the legacy keys. When you have migrated the consumers you found, return to Settings > API Keys and deactivate the old keys. Supabase says deactivation can be reversed if you discover a client that was missed.
Can a scanner find every old Supabase key?
A scanner can be useful as one part of an inventory, but the DEV Community listing alone does not establish what Kavya’s scanner checks, what languages or files it supports, whether it is publicly available, or how accurate or tested it is. Do not treat that listing as evidence that a particular tool covers your deployment.
Regardless of tool, a repository search cannot by itself establish that every deployed app, CI/CD secret, integration, webhook, scheduled job, or worker has been updated. Check those systems and configurations directly, then verify requests in the environments where they actually run before deactivating legacy keys. The article listing appears on the DEV Community Supabase tag page.
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