Handle Google Calendar API sync token expiration (410 Gone) and recover with a full resync
domain: developers.google.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Perform an initial events.list call without a syncToken, paginating with pageToken until the last page returns nextSyncToken; store that token.
On subsequent polls, call events.list with syncToken set and no other filters — timeMin, timeMax, q, and syncToken cannot be combined (returns 400).
Apply only the last page's nextSyncToken as the new stored token; earlier pages only carry nextPageToken.
Catch HTTP 410 responses (sync token no longer valid) by discarding the stored token, wiping your local mirror of that calendar's state, and re-running a full, non-incremental sync.
After the full resync completes, capture the new nextSyncToken from the final page as usual.
Known gotchas
A 410 can happen well before any documented expiry window (token rotation, ACL changes, or prolonged inactivity can all invalidate it), so treat it as a normal recoverable case, not a rare edge case.
Combining incremental syncToken requests with query filters like q/timeMin/timeMax is rejected outright — filters can only be used on full (non-incremental) list calls.
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