docs/_docs/code-snippets/nodejs/authentication.js

const IgniteClient = require('apache-ignite-client');
const IgniteClientConfiguration = IgniteClient.IgniteClientConfiguration;

async function connectClient() {
    const igniteClient = new IgniteClient(onStateChanged);
    try {
        //tag::auth[]
        const ENDPOINT = 'localhost:10800';
        const USER_NAME = 'ignite';
        const PASSWORD = 'ignite';

        const igniteClientConfiguration = new IgniteClientConfiguration(
            ENDPOINT).setUserName(USER_NAME).setPassword(PASSWORD);
        //end::auth[]
        // Connect to Ignite node
        await igniteClient.connect(igniteClientConfiguration);
    } catch (err) {
        console.log(err.message);
    }
}

function onStateChanged(state, reason) {
    if (state === IgniteClient.STATE.CONNECTED) {
        console.log('Client is started');
    } else if (state === IgniteClient.STATE.CONNECTING) {
        console.log('Client is connecting');
    } else if (state === IgniteClient.STATE.DISCONNECTED) {
        console.log('Client is stopped');
        if (reason) {
            console.log(reason);
        }
    }
}

connectClient();