Connectivity gaps still exist — rural courthouses, low-income neighborhoods, crowded shelters. Justice tools that require internet exclude the most vulnerable users. When someone needs to file a form or check a deadline and there is no signal, the system fails them.

A local-first database that works offline, syncs when connection returns, and falls back to SMS for critical communications. Full functionality without internet — forms can be filled, documents reviewed, and deadlines tracked regardless of connectivity.

graph LR
    A[Local-First Database] --> A1[IndexedDB]
    A --> A2[SQLite]
    A --> B[Offline Operation]
    B --> B1[Full CRUD]
    B --> B2[Operation Queue]
    B --> C[Connection Monitor]
    C --> D[Sync Engine]
    D --> D1[Conflict Resolution - CRDT]
    D --> D2[Delta Sync]
    D --> D3[Retry Queue]
    D --> E[Remote Server]
    C --> F[SMS Fallback]
    F --> F1[Critical Alerts via Twilio]

• Rural court users — access justice tools in areas with poor connectivity
• Shelter residents — use legal tools on shared or limited devices
• Low-income communities — work with unreliable or no internet access
• Disaster-affected areas — maintain case access during emergencies
• Mobile court programs — operate in the field without infrastructure

• Local-first database — IndexedDB (browser) + SQLite (mobile/desktop)
• Full offline CRUD operations — create, read, update, delete without internet
• Automatic sync on reconnection — seamless background synchronization
• Conflict resolution (CRDT-based) — deterministic merge without data loss
• SMS fallback for critical notifications — deadline alerts via text message
• Bandwidth-optimized delta sync — only transfer what changed
• Connection quality monitoring — adapt behavior to network conditions

npm install @justice-os/offline-sync

import { LocalStore, SyncEngine, ConnectionMonitor } from '@justice-os/offline-sync';

// Initialize the local-first database
const store = new LocalStore({ database: 'indexeddb', name: 'justice-app' });
await store.initialize();

// Work offline — all operations are local-first
await store.put('cases', { id: 'case-1', title: 'Housing Dispute', status: 'active' });
const myCase = await store.get('cases', 'case-1');

// Monitor connectivity
const monitor = new ConnectionMonitor();
monitor.on('online', () => console.log('Back online!'));
monitor.on('offline', () => console.log('Working offline'));

// Sync when connection returns
const sync = new SyncEngine({
  localStore: store,
  remoteUrl: 'https://api.justice-os.org/sync',
});

monitor.on('online', () => sync.syncAll());

See docs/architecture.md for system design and Mermaid diagrams.

See docs/data-model.md for entity relationship diagrams.

See CONTRIBUTING.md for guidelines.

This repository is part of the Justice OS open-source ecosystem — 32 interconnected projects building the infrastructure for accessible justice technology.

Built with purpose. Open by design. Justice for all.

This project is provided for informational and educational purposes only and does not constitute legal advice, legal representation, or an attorney-client relationship. No warranty is made regarding accuracy, completeness, or fitness for any particular legal matter. Always consult a licensed attorney in your jurisdiction before making legal decisions. Use of this software does not create any professional-client relationship.

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