breezedb

BreezeDB

A lightweight, feature-rich persistent key-value store with TTL, compression, encryption, and event support.

Features

• 🚀 Simple API - Easy to use key-value operations
• 💾 Persistent Storage - Automatic saving to JSON files
• ⏰ TTL Support - Set expiration times for keys
• 🗜️ Compression - Optional gzip compression
• 🔐 Encryption - Optional AES-256-CBC encryption
• 📦 Batch Operations - Efficient bulk operations
• 🎯 Events - Listen to database operations
• 🔄 Atomic Writes - Safe concurrent access
• 💨 Fast - In-memory operations with async persistence
• 🛡️ Backup & Recovery - Automatic backup files

Installation

npm install breezedb

Quick Start

JavaScript (ES Modules)

import BreezeDB from 'breezedb';

// Create a new database
const db = new BreezeDB('./mydata.json');

// Set values
db.set('user:1', { name: 'Alice', age: 30 });
db.set('config', { theme: 'dark', lang: 'en' });

// Get values
const user = db.get('user:1');
console.log(user); // { name: 'Alice', age: 30 }

// Set with expiration (TTL)
db.set('session:abc', { token: 'xyz' }, 3600); // expires in 1 hour

// Delete keys
db.delete('user:1');

// Check existence
if (db.has('config')) {
  console.log('Config exists!');
}

// Get all keys
console.log(db.keys()); // ['config', 'session:abc']

// Database info
console.log('Size:', db.size());
console.log('Empty:', db.isEmpty());

TypeScript

import BreezeDB from 'breezedb';
import type { BreezeDBOptions } from 'breezedb';

interface User {
  name: string;
  age: number;
  email?: string;
}

// Type-safe database operations
const db = new BreezeDB('./users.json');

// Set with type inference
db.set<User>('user:1', { name: 'Alice', age: 30 });

// Get with type assertion
const user = db.get<User>('user:1');
if (user) {
  console.log(user.name); // TypeScript knows this is a string
}

// Configuration with types
const options: BreezeDBOptions = {
  compression: true,
  encryption: true,
  encryptionKey: process.env.DB_KEY,
  autoSave: true,
};

const secureDb = new BreezeDB('./secure.json', options);

Advanced Features

TTL (Time To Live)

// Set with TTL (in seconds)
db.set('cache:data', { result: [1, 2, 3] }, 300); // expires in 5 minutes

// Update TTL for existing key
db.setTTL('cache:data', 600); // extend to 10 minutes

// Get remaining TTL
const remaining = db.getTTL('cache:data'); // seconds remaining

// Clear TTL (make permanent)
db.clearTTL('cache:data');

Compression

const db = new BreezeDB('./data.json', {
  compression: true, // Enable gzip compression
});

// Automatically compresses large datasets
db.set('big-data', hugeArray);

Encryption

const db = new BreezeDB('./secure.json', {
  encryption: true,
  encryptionKey: 'your-secret-key-here',
});

// Data is encrypted at rest
db.set('secret', 'confidential-data');

Batch Operations

const operations = [
  { type: 'set', key: 'key1', value: 'value1' },
  { type: 'set', key: 'key2', value: 'value2', ttl: 60 },
  { type: 'delete', key: 'old-key' },
];

const results = db.batch(operations);
console.log(results); // Array of operation results

Events

// Listen to database events
db.on('set', ({ key, value, oldValue, ttl }) => {
  console.log(`Set ${key} = ${value}`);
});

db.on('get', ({ key, value }) => {
  console.log(`Got ${key} = ${value}`);
});

db.on('delete', ({ key, oldValue }) => {
  console.log(`Deleted ${key}`);
});

db.on('expired', ({ keys }) => {
  console.log(`Expired keys: ${keys.join(', ')}`);
});

db.on('save', ({ filePath }) => {
  console.log(`Saved to ${filePath}`);
});

db.on('error', error => {
  console.error('Database error:', error);
});

Manual Persistence

// Auto-save is enabled by default
const db = new BreezeDB('./data.json', {
  autoSave: false, // Disable auto-save
});

// Save manually (async)
await db.save();

// Save manually (sync)
db.saveSync();

// Load from disk
await db.load();

Configuration Options

const db = new BreezeDB('./data.json', {
  // Auto-save settings
  autoSave: true, // Enable auto-save (default: true)
  autoSaveInterval: 5000, // Auto-save interval in ms (default: 5000)

  // TTL settings
  ttlCleanupInterval: 60000, // TTL cleanup interval in ms (default: 60000)

  // Compression
  compression: false, // Enable compression (default: false)

  // Encryption
  encryption: false, // Enable encryption (default: false)
  encryptionKey: null, // Encryption key (required if encryption enabled)

  // Formatting
  pretty: false, // Pretty-print JSON (default: false)
});

API Reference

Constructor

new BreezeDB(filePath, options)

• filePath (string): Path to the database file
• options (object): Configuration options

Core Methods

set(key, value, ttl?)

Set a key-value pair with optional TTL in seconds.

get(key)

Get a value by key. Returns undefined if not found or expired.

has(key)

Check if a key exists and is not expired.

delete(key)

Delete a key. Returns true if the key existed.

clear()

Remove all keys from the database.

TTL Methods

setTTL(key, ttl)

Set TTL for an existing key. Returns true if successful.

getTTL(key)

Get remaining TTL in seconds. Returns null if no TTL set.

clearTTL(key)

Remove TTL from a key. Returns true if TTL was cleared.

Batch Methods

batch(operations)

Execute multiple operations atomically.

Utility Methods

keys()

Get array of all non-expired keys.

values()

Get array of all non-expired values.

entries()

Get array of all non-expired [key, value] pairs.

size()

Get number of non-expired keys.

isEmpty()

Check if database is empty.

Persistence Methods

save()

Save database to disk (async).

saveSync()

Save database to disk (sync).

load()

Load database from disk (async).

close()

Close database and clean up resources.

Performance

BreezeDB is designed for applications that need:

• Fast read/write operations (in-memory)
• Persistent storage (JSON files)
• Moderate data sizes (up to ~100MB recommended)

For larger datasets or high-concurrency scenarios, consider using a dedicated database server.

Error Handling

// Handle errors with events
db.on('error', error => {
  console.error('Database error:', error);
});

// Or with try-catch for specific operations
try {
  await db.save();
} catch (error) {
  console.error('Save failed:', error);
}

File Recovery

BreezeDB automatically creates backup files:

• database.json - Main database file
• database.json.backup - Previous version backup
• database.json.tmp - Temporary file during writes

If the main file becomes corrupted, BreezeDB will attempt to restore from the backup automatically.

Examples

See the examples directory for more usage examples:

• Basic Usage
• Advanced Features

License

MIT © Jesse Palmer

Contributing

Pull requests are welcome! Please feel free to submit issues and enhancement requests.

Changelog

1.0.0

• Initial release
• Core key-value operations
• TTL support
• Compression and encryption
• Batch operations
• Event system
• Atomic writes and backup recovery