Spent a day debugging a WebSocket that connected twice. React 18 Stri…

Kabir Singh

Full Stack Dev | Node.js, React, MongoDB | Travel-tech | Open to backend-heavy roles

8 Oct 2026 Frontend Folks

Spent a day debugging a WebSocket that connected twice. React 18 Strict Mode mounts components twice in dev to surface missing cleanups. Returning a cleanup function that closes the socket fixed it. Strict Mode was right all along 😅

8 reactions2 comments

Comments

VP
Vivaan Patel8 Oct 2026
Strict Mode double-mount has caught so many bugs for us.
AR
Ananya Rao8 Oct 2026
I understood half of this but I'm happy for you 😄

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Spent a day debugging a WebSocket that connected twice. React 18 Strict Mode mounts components twice in dev…

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Spent a day debugging a WebSocket that connected twice. React 18 Strict Mode mounts components twice in dev…

Comments