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JavaScript IndexedDB Transaction Error Fix

DodaTech Updated 2026-06-24 3 min read

In this tutorial, you'll learn about JavaScript IndexedDB Transaction Error Fix. We cover key concepts, practical examples, and best practices.

The Problem

IndexedDB transactions auto-commit when all pending requests complete and control returns to the event loop. Attempting to use a transaction after it has committed throws TransactionInactiveError. Concurrent transaction conflicts and version upgrade errors also cause data loss.

Quick Fix

Step 1: Complete all operations before transaction commits

const db = await openDatabase();

// Wrong — transaction auto-commits before second operation
const tx = db.transaction('store', 'readwrite');
const store = tx.objectStore('store');
store.put({ id: 1, name: 'Alice' });

setTimeout(() => {
    store.put({ id: 2, name: 'Bob' });
    // DOMException: TransactionInactiveError
}, 100);

// Right — do all operations synchronously within the transaction
const tx = db.transaction('store', 'readwrite');
const store = tx.objectStore('store');
store.put({ id: 1, name: 'Alice' });
store.put({ id: 2, name: 'Bob' });
tx.done.then(() => console.log('Transaction complete'));

Step 2: Use a single transaction for batch writes

// Wrong — multiple separate transactions (slow)
for (const item of items) {
    const tx = db.transaction('store', 'readwrite');
    tx.objectStore('store').put(item);
}

// Right — batch in one transaction
const tx = db.transaction('store', 'readwrite');
const store = tx.objectStore('store');
for (const item of items) {
    store.put(item);
}
tx.done.then(() => console.log('All items saved'));

Step 3: Handle version upgrade errors

// Wrong — no version handling
const request = indexedDB.open('MyDB', 3);

// Right — handle upgrade and error
const request = indexedDB.open('MyDB', 3);

request.onupgradeneeded = (event) => {
    const db = event.target.result;
    if (!db.objectStoreNames.contains('store')) {
        db.createObjectStore('store', { keyPath: 'id' });
    }
};

request.onerror = (event) => {
    console.error('Database error:', event.target.error.message);
};

request.onblocked = () => {
    console.warn('Database upgrade blocked — close other tabs');
};

Step 4: Handle transaction abort

const tx = db.transaction('store', 'readwrite');

tx.onabort = (event) => {
    console.error('Transaction aborted:', event.target.error?.message);
};

tx.onerror = (event) => {
    console.error('Transaction error:', event.target.error?.message);
    event.preventDefault();
};

try {
    tx.objectStore('store').put(invalidData);
} catch (e) {
    console.error('Failed to put data:', e.message);
}

Prevention

  • Complete all operations synchronously after creating a transaction
  • Use tx.done to wait for transaction completion
  • Handle onupgradeneeded for schema changes during database open
  • Listen for onabort and onerror on transactions
  • Close the database connection properly when done

Common Mistakes with indexeddb transaction

  1. Using foldl instead of foldl' causing stack overflow on large lists
  2. Forgetting deriving (Show, Eq) on custom data types needed for debugging
  3. Placing the wildcard pattern first in case expressions, making all subsequent patterns unreachable

These mistakes appear frequently in real-world JS code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

### Why does my IndexedDB transaction become inactive?

Transactions auto-commit when the current event loop task finishes and no more requests are queued. To keep a transaction alive, queue another request before control returns to the event loop. Use tx.done to detect when it commits.

Can I use multiple object stores in one transaction?

Yes. Create a transaction with multiple store names: db.transaction(['store1', 'store2'], 'readwrite'). All operations on these stores share the same transaction lifetime.

What happens when two tabs write to the same store?

IndexedDB uses pessimistic concurrency. If two transactions conflict, one succeeds and the other throws ConstraintError or AbortError. Use onabort to retry failed transactions.

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