What are the key features of IndexedDB?

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Ponu Maurya · Answer

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 and 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 queuesCaching API responsesStoring user sessions/profilesMedia storage (offline images, PDFs)Synchronization with a backend when online
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What are the key features of IndexedDB?

Ponu Maurya

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Key Features of IndexedDB

1. Client-Side NoSQL Database

2. Large Storage Capacity

3. Asynchronous API

4. Structured Data Storage

5. Indexed Object Stores

6. Transactional Support

7. Versioned Database Schema

8. Binary Data Storage

9. Works Offline

10. Origin-Based Security

11. Event-Driven & Promise Support

12. Supports Compound Keys and Key Paths

Example Use Cases

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