Edge Functions are easy to miss in a migration. They are not visible in a table view, they carry their own secrets, and they usually integrate with services that live outside the platform. When they break, they break silently until a user hits the code path.
Why Edge Functions are easy to miss during migration
Most migration playbooks focus on the database. Edge Functions live in a separate deployment surface, use per-function secrets, and depend on network policies that do not transfer automatically. Teams often only notice the gap when a webhook or scheduled job fails after cutover.
What Edge Functions depend on
Environment variables
Runtime configuration such as feature flags, base URLs, and log levels.
Secrets
Service role keys, third-party API keys, signing secrets, and OAuth client secrets.
Database access
Correct database URL, permissions for the service role, and any custom search paths.
Storage access
Bucket names and policies that allow the function's role to read or write.
External APIs
IP allow-lists or webhook signatures that may reference the old project.
Auth context
JWT verification keys and expected issuers, which change when the project changes.
Packaging functions for deployment
Package each function with its dependencies pinned, its expected env vars documented, and a smoke test that can run against the destination before real traffic hits it.
Testing after migration
- Invoke each function with a known-safe payload.
- Verify logs are flowing to the destination project.
- Confirm webhooks from third parties reach the new endpoint.
- Re-run any scheduled invocations that failed during cutover.
Common errors
- Missing environment variable, function returns 500 on cold start.
- Service role key still points at the source project.
- External webhook signature fails because the secret was not rotated.
- Function deployed but old caller URL is still cached.
How Miglify helps detect and package Edge Functions
Miglify inspects the source project for every Edge Function, lists the secrets each one reads, and packages them for deployment on the destination. Teams see the full function inventory instead of discovering it in production.
Final thoughts
Treat Edge Functions as first-class migration surface. Package them, test them, and confirm every secret before you move traffic. The cost of an unnoticed broken function grows with every user who hits it.
Miglify keeps every step observable — analyze source, validate destination, and prepare rollback-aware runs before you cut over.