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All topics›JavaScript›Offline & storage

Pick the right storage for the job

intermediatelayer I9 · Offline & storage4 tests

Write pickStorage({ sizeMB, structured, mustSurviveTabClose, sentToServer }) returning one of "cookie", "IndexedDB", "sessionStorage", "localStorage" — in that priority order:

  • Needs to ride along on server requests automatically → "cookie"
  • Otherwise, big (>5MB) or structured (not a plain string) → "IndexedDB"
  • Otherwise, doesn't need to survive closing the tab → "sessionStorage"
  • Otherwise → "localStorage"

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