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Hashgraph Online Standards SDK

The Hashgraph Online Standards SDK provides a complete implementation of the Hashgraph Consensus Standards (HCS) protocols, giving developers all the tools needed to build applications on Hedera.

What This SDK Does​

  • Implements HCS Protocols - Provides full implementations of standards at Hashgraph Online
  • Simplifies Complex Interactions - Handles protocol details through clean interfaces and developer-friendly APIs
  • Enables Cross-Platform Development - Works across Node.js, browsers, and edge runtimes

Getting Started​

Installation​

# Using npm
npm install @hashgraphonline/standards-sdk

# Using yarn
yarn add @hashgraphonline/standards-sdk

# Using pnpm
pnpm add @hashgraphonline/standards-sdk

Quick Example​

Here's how to inscribe text data on Hedera using the SDK:

import { inscribe } from '@hashgraphonline/standards-sdk';

async function inscribeText() {
  const result = await inscribe(
    {
      type: 'text',
      content: 'Hello, Hedera!',
      fileName: 'greeting.txt',
    },
    {
      network: 'testnet',
      accountId: '0.0.123456',
      privateKey: 'your-private-key',
    }
  );

  console.log(`Inscription successful on topic ${result.topicId}`);
  console.log(`Transaction ID: ${result.transactionId}`);
}

inscribeText().catch(console.error);

Key Capabilities​

HCS-1: File Data Management​

The foundation for storing and retrieving file data on Hedera:

  • Split large files into manageable chunks
  • Store content on Hedera with metadata
  • Retrieve and reconstruct files from the network

Learn about inscription tools →

HCS-3: Recursion​

Reference and load resources across the graph:

  • Create references to other on-chain resources
  • Securely verify resource integrity
  • Compose complex data structures

Explore HCS-3 features →

HCS-7: Dynamic Assets​

Build programmable on-graph assets:

  • Create assets with state and behaviors
  • Execute state transitions securely
  • Manage asset ownership and transfers

Discover dynamic assets →

HCS-10: Agent Communication​

Enable secure AI agent communication:

  • Register agents on the Hedera Hashgraph
  • Establish secure communication channels
  • Exchange messages between agents

View agent communication →

HCS-11: Identity Profiles​

Implement decentralized identity management:

  • Create and manage identity profiles
  • Verify identities securely
  • Link profiles to Hedera accounts

Learn about identity management →

Technical Benefits​

  • Type Safety - Full TypeScript support with comprehensive type definitions
  • Modular Architecture - Import only the components you need
  • Consistent Interfaces - Common patterns across all standards
  • Developer Utilities - Helper functions for common operations
  • Clean Abstractions - Implementation details hidden behind intuitive APIs

Community and Support​