Simple Connect

The following example shows how to instantiate a Polkadot API object and use it to connect to a node using ApiPromise.

// Required imports

const { ApiPromise, WsProvider } = require('@polkadot/api');

async function main () {

// Initialise the provider to connect to the local node

const provider = new WsProvider('ws://127.0.0.1:9944');

// Create the API and wait until ready

const api = await ApiPromise.create({ provider });

// Retrieve the chain & node information information via rpc calls

const [chain, nodeName, nodeVersion] = await Promise.all([

api.rpc.system.chain(),

api.rpc.system.name(),

api.rpc.system.version()

]);

console.log(`You are connected to chain ${chain} using ${nodeName} v${nodeVersion}`);

}

main().catch(console.error).finally(() => process.exit());