IndexedDB Alternatives

IndexedDB is the standard browser storage API for storing significant amounts of structured data, including files/blobs. It is available in every modern browser. However, using the native IndexedDB API is verbose, low-level, and lacks many features modern applications need.

If you are looking for an IndexedDB alternative, you likely want a library that abstracts the complexity away and provides features like Reactivity, Schema Validation, and Sync.

RxDB is the ultimate alternative because it gives you the speed of a local database with the ease of use of a modern JSON-document store.

The Problem with Raw IndexedDB

IndexedDB was designed as a low-level building block, not a developer-facing database engine. Because of that, relying on raw IndexedDB (or thin wrappers) often leads to significant friction:

1. Callback Hell: The API heavily relies on event handlers (onsuccess, onerror), making control flow difficult to read and maintain.
2. Missing Observability: Standard IndexedDB provides no way to listen to data changes. You have to build your own event bus to update the UI when data changes.
3. Complex Transaction Management: You must explicitly create transactions for every read or write, which is repetitive and error-prone.
4. No Schema Enforcement: IndexedDB is schema-less. You can store anything, which sounds good until your app crashes because of inconsistent data structures.
5. Limited Querying: You can only query by simple key ranges. Complex queries (like "find users older than 18 and sort by name") require manually iterating over cursors, which is slow and code-heavy. See Slow IndexedDB.

RxDB solves all of these problems while maintaining the benefits of a local database.

Why RxDB is the Best Alternative

RxDB is a NoSQL database for JavaScript applications. It uses IndexedDB (or faster alternatives) under the hood but provides a rich, feature-complete API on top.

1. Developer Experience

RxDB offers a promise-based API that feels intuitive for JavaScript developers. It uses JSON Schema to define your data structure, ensuring you never store invalid data.

Raw IndexedDB:

const request = indexedDB.open('myDatabase', 1);
request.onupgradeneeded = (event) => { /* Handle versions */ };
request.onsuccess = (event) => {
  const db = event.target.result;
  const transaction = db.transaction(['users'], 'readonly');
  const store = transaction.objectStore('users');
  const getRequest = store.get('user1');
  getRequest.onsuccess = () => {
    console.log(getRequest.result); // Finally got the data
  };
};

RxDB:

const db = await createRxDatabase({
  name: 'myDatabase',
  storage: getRxStorageDexie() // Uses IndexedDB under the hood
});
// Define collection once
await db.addCollections({
  users: { schema: myJsonSchema }
});
// Query data
const user = await db.users.findOne('user1').exec();

2. Reactivity (The "Rx" in RxDB)

Modern UIs (React, Vue, Angular, Svelte) need to be reactive. When data changes, the view should update. RxDB is built on RxJS. Every query, document, or field can be observed.

// Subscribe to a query -> UI updates automatically on change
db.users.find({
  selector: { age: { $gt: 18 } }
}).$.subscribe(users => {
  updateUI(users);
});

This works even across multiple browser tabs. If a user changes data in Tab A, Tab B updates instantly. Implementing this with raw IndexedDB and BroadcastChannel manually is a massive undertaking. See Reactivity.

3. Advanced Query Engine

Searching for data in raw IndexedDB requires opening cursors and iterating over records manually, which is slow and complex. RxDB includes Mango Query syntax (like MongoDB). You can filter, sort, and limit data with a simple JSON object.

const results = await db.users.find({
  selector: {
    age: { $gt: 18 },
    role: { $in: ['admin', 'moderator'] }
  },
  sort: [{ name: 'asc' }],
  limit: 10
}).exec();

4. Synchronization

Raw IndexedDB is purely local. Usage in real-world apps usually requires syncing data with a backend. Building a robust sync protocol (handling offline changes, conflict resolution, delta updates) is one of the hardest problems in software engineering.

RxDB solves this out of the box. It has a robust replication protocol that supports:

• Real-time sync: Changes are pushed/pulled immediately.
• Conflict Resolution: Strategies to handle concurrent edits.
• Multi-Backend: Plugins for CouchDB, GraphQL, Firestore, Supabase, and generic HTTP.

5. Performance & Storage Engines

While IndexedDB is fast enough for simple tasks, it can be the bottleneck for high-performance apps due to serialization overhead and browser implementation details. See RxStorage Performance.

RxDB abstracts the storage layer. You can start with IndexedDB and switch to unparalleled performance engines later without changing your application code:

• Dexie.js RxStorage: A optimized wrapper around IndexedDB.
• OPFS RxStorage: Uses the Origin Private File System, which is significantly faster than IDB for many operations.
• SQLite RxStorage: Uses SQLite via WebAssembly (or Native in React Native/Electron) for robust SQL-based storage.
• Memory RxStorage: For ephemeral data or testing.

6. TypeScript Support

IndexedDB API is loosely typed. You often cast any or struggle with correct event types. RxDB is written in TypeScript and provides first-class type safety. Your database schema generates TypeScript types, so you get autocomplete for every field in your documents and queries.

// TypeScript knows that 'age' is a number
const user = await db.users.findOne().exec();
console.log(user.age.toFixed(2));

7. Encryption & Compression

Storing sensitive data? RxDB has Encryption built-in. You provide a password, and the data is stored encrypted at rest. Storing lots of data? The Key-Compression plugin shrinks your JSON keys to minimize storage usage, often reducing database size by 40%+.

Other Alternatives

There are other ways to store data in the browser, but they all have significant limitations compared to IndexedDB (and RxDB).

LocalStorage

localStorage is a synchronous key-value store. See Using localStorage.

• Why it fails: It blocks the main thread (UI freezes on large reads/writes). It is capped at ~5MB. It only supports strings, so you must constantly JSON.parse and JSON.stringify.
• Use case: Simple settings like "dark mode: on".

Cookies

Cookies are small pieces of data sent with every HTTP request.

• Why it fails: Extremely limited size (4KB). Wastes bandwidth by sending data to the server on every request.
• Use case: Session tokens, authentication.

WebSQL

WebSQL was a wrapper around SQLite but is deprecated and removed from non-Google browsers.

• Why it fails: It is a dead standard. Do not use it.
• Use case: Legacy apps only.

OPFS (Origin Private File System)

OPFS is a new high-performance file system API for the web.

• Why it fails: It is a file system, not a database. It has no indexing, no querying, and no document structure. It is extremely low-level.
• Note: RxDB uses OPFS in its OPFS RxStorage to give you the performance of OPFS with the features of a real database.

Comparison

Feature	Raw IndexedDB	RxDB
Api Style	Event-based / Callback	Promise / Observable
Reactivity	❌ None	✅ Observables / Signals
Sync	❌ Manual Implementation	✅ Built-in & Backend Agnostic
Query Engine	❌ Basic Key-Range	✅ MongoDB-style (Mango)
Transactions	✅ Manual	✅ Automatic
Schema	❌ None	✅ JSON Schema
Migrations	⚠️ Manual	✅ Declarative
Multi-Tab Sync	❌ Manual	✅ Automatic
Encryption	❌ None	✅ Built-in
TypeScript	⚠️ Partial	✅ Full Support

Conclusion

If you are building a toy project, localStorage or a simple wrappers like idb-keyval might suffice. But if you are building a production application that needs to be fast, reliable, and maintainable, relying on raw IndexedDB is a premature optimization that costs you development time.

RxDB is the "Battery Included" alternative that handles the hard parts of local data (sync, reactivity, queries) so you can focus on building your product. For further reading, check out Why Local-First Software Is the Future or RxDB as a Database for Browsers.