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Home Interviews How do you log and trace errors when many IndexedDB requests are failing silently in production? – MindStick
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ICSM Computer
ICSM Computer 13 Jul 2025
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Logging and Tracing Silent IndexedDB Failures in Production

IndexedDB is essential for offline-first web apps, but it often fails silently—especially when developers omit proper error handling. These silent issues can result from quota limits, browser restrictions, incognito mode, or missing onerror handlers.

To trace such issues, always handle errors explicitly:

const request = store.get("key");
request.onerror = e => logError("Read failed", e.target.error);

For promise-based wrappers like Dexie:

try {
  await db.store.get("key");
} catch (err) {
  logError("Dexie error", err);
}

Implement a centralized logging function:

function logError(context, error) {
  const payload = {
    context,
    message: error?.message || String(error),
    time: new Date().toISOString(),
    userAgent: navigator.userAgent
  };
  console.error(payload);
  fetch("/log-error", {
    method: "POST",
    body: JSON.stringify(payload),
    headers: { "Content-Type": "application/json" }
  }).catch(() => {
    // fallback to localStorage
    const logs = JSON.parse(localStorage.getItem("errorLogs") || "[]");
    logs.push(payload);
    localStorage.setItem("errorLogs", JSON.stringify(logs));
  });
}

Catch global unhandled exceptions too:

window.onerror = (msg, src, line, col, err) => logError("window.onerror", err);
window.onunhandledrejection = e => logError("Promise rejection", e.reason);

Detect known errors like QuotaExceededError, InvalidStateError, and NotFoundError to provide better context.

Wrap and log all critical DB operations, and if offline, save logs locally to sync later using navigator.onLine.

Lastly, use DevTools to inspect IndexedDB, and tools like Sentry for central monitoring.

By proactively catching, logging, and syncing IndexedDB errors, you’ll avoid data loss and maintain app reliability—even in complex offline conditions.

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