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Ponu Maurya
Ponu Maurya

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Ponu Maurya
Ponu Maurya 01 Jul 2025
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Here are the key features of IndexedDB — a powerful browser-based storage system:

Key Features of IndexedDB

1. Client-Side NoSQL Database

  • IndexedDB stores data as key-value pairs.
  • You can store JavaScript objects, not just strings.

2. Large Storage Capacity

  • Supports tens to hundreds of MBs, depending on the browser.
  • Much higher limit than localStorage (which is ~5MB).

3. Asynchronous API

  • Most operations are non-blocking, using events or Promises.
  • Prevents UI freezing during data access or heavy reads.

4. Structured Data Storage

  • Supports complex objects, arrays, nested data.
  • No need to serialize/deserialize with JSON.stringify().

5. Indexed Object Stores

  • Create indexes for fast lookup on specific fields.
  • Example: search users by email or username.

6. Transactional Support

  • All read/write operations happen inside a transaction.
  • Ensures data integrity and consistency.

7. Versioned Database Schema

  • Use onupgradeneeded to update structure (add object stores, indexes).
  • Each schema change increases the version number.

8. Binary Data Storage

  • Can store Blobs, ArrayBuffers, and Files.
  • Useful for offline caching of images, audio, or video.

9. Works Offline

  • Ideal for offline-first applications.
  • Combine with Service Workers or Background Sync for robust PWAs.

10. Origin-Based Security

  • IndexedDB data is isolated to a single domain or origin.
  • Secure and sandboxed per website.

11. Event-Driven & Promise Support

  • Originally event-based, but now widely used with Promise wrappers (like the idb library).

12. Supports Compound Keys and Key Paths

  • Use object paths (like user.id) as primary keys.
  • Supports auto-increment and composite keys.

Example Use Cases

  • Offline form submission queues
  • Caching API responses
  • Storing user sessions/profiles
  • Media storage (offline images, PDFs)
  • Synchronization with a backend when online
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