1
Verify the likely cause
Move submission into the event handler, make the API idempotent and keep effects limited to synchronization with external state.
FULL AI ANALYSIS
React form submits twice in development mode
Generated Sep 19, 2026, 11:55:04 AM
Analysis summary
The reported behaviour is consistent with a side effect performs the mutation and is intentionally re-run by Strict Mode. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.
Possible causes
A side effect performs the mutation and is intentionally re-run by Strict Mode.
73%A recent software, firmware or configuration change is exposing an existing compatibility issue.
43%Suggested fixes
2
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.