🗃️ DWS KV Store

A lightweight, abstract key-value store with TTL support, increment/decrement operations, and built-in input validation.
Swap between in-memory and Redis without changing a single line of business logic.

Why this package?

Every project eventually needs a key-value store — for caching, rate-limiting, sessions, counters, etc.
You either couple yourself to a specific backend or build your own abstraction every time.

@dws-std/kv-store gives you a clean KvStore base class with two ready-to-use adapters:

• MemoryStore — in-memory Map with TTL, automatic expired-entry cleanup, and configurable max size.
• BunRedisStore — thin wrapper around Bun's native RedisClient, same API, no surprises.

Both share the same interface, so switching from memory to Redis (or writing your own adapter) is trivial.

📌 Table of Contents

• Features
• Installation
• Usage
• API Reference
• License
• Contact

✨ Features

• 🔑 Unified API : get, set, del, increment, decrement, expire, ttl, clean — same interface for every adapter.
• ⏱️ TTL Support : Set expiration in seconds on any key.
• 🛡️ Built-in Validation : Keys, TTL values, and amounts are validated before reaching the storage layer.
• 🧠 MemoryStore : Zero-dependency in-memory store with background cleanup and optional max size.
• 🔴 BunRedisStore : Native Bun Redis adapter, async by default.
• 📦 Zero External Dependencies : Only depends on @dws-std/error.

🔧 Installation

bun add @dws-std/kv-store

⚙️ Usage

MemoryStore — In-Memory

import { MemoryStore } from '@dws-std/kv-store';

const store = new MemoryStore();

store.set('user:42', { name: 'Alice' }, 300); // TTL of 5 minutes
const user = store.get<{ name: string }>('user:42');

store.set('hits', 0);
store.increment('hits');      // 1
store.increment('hits', 5);   // 6
store.decrement('hits');      // 5

store.ttl('user:42');         // remaining seconds
store.del('user:42');         // true
store.clean();                // removes all keys, returns count

store.destroy();              // stops cleanup timer and clears data

You can configure the cleanup interval and max size:

const store = new MemoryStore(
  60_000, // cleanup every 60 seconds (default: 5 minutes)
  10_000  // max 10 000 entries (default: Infinity)
);

BunRedisStore — Redis

import { BunRedisStore } from '@dws-std/kv-store';

const store = new BunRedisStore('redis://localhost:6379');
await store.connect();

await store.set('session:abc', { userId: 1 }, 3600);
const session = await store.get<{ userId: number }>('session:abc');

await store.increment('rate:ip:127.0.0.1');
await store.expire('rate:ip:127.0.0.1', 60);

store.close();

Custom Adapter

Extend KvStore and implement the abstract methods:

import { KvStore } from '@dws-std/kv-store';

class MyStore extends KvStore {
  get<T>(key: string): T | null { /* ... */ }
  set<T>(key: string, value: T, ttlSec?: number): void { /* ... */ }
  increment(key: string, amount?: number): number { /* ... */ }
  decrement(key: string, amount?: number): number { /* ... */ }
  del(key: string): boolean { /* ... */ }
  expire(key: string, ttlSec: number): boolean { /* ... */ }
  ttl(key: string): number { /* ... */ }
  clean(): number { /* ... */ }
}

Use KvStore._validateKey(), KvStore._validateTtl(), and KvStore._validateAmount() for built-in validation.

📚 API Reference

Full docs: Dominus-Web-Service.github.io/packages

⚖️ License

MIT — Feel free to use it.

📧 Contact

• GitHub: Dominus-Web-Service