ts-sdk-client

TypeScript SDK: Aptos Client

Purpose

Guide creation and configuration of the Aptos client and AptosConfig in @aptos-labs/ts-sdk. One client instance is used for all read/write and account/transaction APIs.

ALWAYS

1. Create one Aptos instance per app (singleton) and reuse it – avoid multiple new Aptos(config) for the same network.
2. Configure network via AptosConfig – use Network.TESTNET or Network.MAINNET (or custom endpoints).
3. Use environment variables for network/URLs in production – e.g. process.env.APTOS_NETWORK or import.meta.env.VITE_APP_NETWORK.
4. Use Network.TESTNET as default for development – devnet resets frequently.

NEVER

1. Do not create a new Aptos client per request – reuse the singleton.
2. Do not hardcode fullnode/indexer URLs in source when using public networks – use Network enum.
3. Do not omit network when using custom endpoints – in v5.2+ use Network.CUSTOM with custom URLs.

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Basic setup

import { Aptos, AptosConfig, Network } from "@aptos-labs/ts-sdk";

const config = new AptosConfig({ network: Network.TESTNET });
const aptos = new Aptos(config);

---

Network options

// Predefined networks
const devnet = new AptosConfig({ network: Network.DEVNET });
const testnet = new AptosConfig({ network: Network.TESTNET });
const mainnet = new AptosConfig({ network: Network.MAINNET });

// Custom endpoints (network is REQUIRED in v5.2+)
const custom = new AptosConfig({
  network: Network.CUSTOM,
  fullnode: "https://your-fullnode.example.com/v1",
  indexer: "https://your-indexer.example.com/v1/graphql",
  faucet: "https://your-faucet.example.com"
});

---

Singleton pattern (recommended)

// lib/aptos.ts or similar
import { Aptos, AptosConfig, Network } from "@aptos-labs/ts-sdk";

function getNetwork(): Network {
  const raw = typeof process !== "undefined" ? process.env.APTOS_NETWORK : import.meta.env?.VITE_APP_NETWORK;
  switch (raw) {
    case "mainnet":
      return Network.MAINNET;
    case "devnet":
      return Network.DEVNET;
    default:
      return Network.TESTNET;
  }
}

const config = new AptosConfig({ network: getNetwork() });
export const aptos = new Aptos(config);