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

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

const igniteClient = new IgniteClient(onStateChanged);

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