How to Fix IndexedDB Error in Angular

If you've encountered a IndexedDB Error while working with Angular, you're not alone. This is one of the most common issues developers face.

What Causes This Error

IndexedDB errors in Angular commonly occur due to version conflicts when the schema changes, blocked database opens when another tab holds a connection, or storage quota exceeded errors on the user's device.

The Fix

The key is to handle onupgradeneeded for schema creation and wrap IndexedDB calls in Promises:

@Injectable({ providedIn: "root" })
export class DbService {
  private db: IDBDatabase | null = null;

  open(): Promise<IDBDatabase> {
    return new Promise((resolve, reject) => {
      const request = indexedDB.open("appDB", 1);
      request.onerror = () => reject(request.error);
      request.onupgradeneeded = (event) => {
        const db = request.result;
        if (!db.objectStoreNames.contains("items")) {
          db.createObjectStore("items", { keyPath: "id" });
        }
      };
      request.onsuccess = () => {
        this.db = request.result;
        this.db.onerror = (e) => console.error("DB error:", e);
        resolve(this.db);
      };
    });
  }
}

Common Pitfall

A common mistake is to ignore this error during development because it only surfaces under specific conditions. Always test with production-like settings to catch these issues early. If you're working in a team, document this fix in your project's troubleshooting guide so others don't hit the same wall.

Verify the Fix

After applying the fix, restart your Angular application and verify the error no longer appears in the console or logs. Test both the happy path and edge cases to be thorough. If the error persists, double-check that your changes were saved and the application fully restarted.

Prevention

Tools like [Bugsly](https://bugsly.dev) can catch these Angular errors in real time, giving you stack traces and context to fix issues faster.