Async and fetch repair deck
Recall the basic async and fetch checks that prevent stuck UI and misleading errors.
Event loop Promise callback vs zero-delay timer A timer with zero delay is not the same as synchronous execution. HTTP status The request did not throw, so the API call must have worked. The server returned a 500 response and an HTML error page. Your line fetch can resolve with a non-OK response. Check response.ok before parsing and throw a useful error if it is false. Going straight to response.json() can turn a status failure into a misleading parse failure. It separates transport success from application-level HTTP success. Cleanup Where should loading cleanup go in a basic async flow? In…
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