npm install socket.io-client

import io from "socket.io-client";

// {Your websocket message ID} - This is a unique identifier for your WebSocket message. You need to replace this placeholder with an actual ID that is relevant to your application.
const messageId = "{Your websocket message ID}"; 

// eventType specifies the type of event you want to subscribe to on the blockchain. For example, "BLOCK_PERIOD" could be used to receive events related to blockchain block timings.
const eventType = "BLOCK_PERIOD";

// The WebSocket URL to connect to. You need to use the appropriate URL provided by your blockchain service provider.
const url = "wss://web3.nodit.io/v1/websocket";

// Parameters for configuring the subscription. You should replace the placeholder in 'description' with a brief description of your WebSocket connection's purpose.
const params = {
  description: "{description about your websocket}",
  condition: {
    period: 1 // You can set this to any integer greater than zero. This could be used to specify the frequency of events, such as receiving an event every 'n' blocks.
  }
};

// Options for the WebSocket connection. These include security settings and additional parameters required by the server.
const options = {
  rejectUnauthorized: false, // This should be true in production for better security unless your server uses a self-signed certificate.
  transports: ["websocket"],
  path: "/v1/websocket/",
  auth: {
      apiKey: "{Your Api Key}", // Replace this with your actual API key provided by the service.
  },
  query: {
      protocol: "{protocol}", // Replace this with the blockchain protocol you are interacting with, e.g., "ethereum", "arbitrum", etc.
      network: "{network}", // Replace this with the specific network you are targeting, e.g., "mainnet", "testnet".
  },
};

// This function establishes a connection to the server and handles various WebSocket events.
function connectToServer() {
  return new Promise((resolve, reject) => {
    const socket = io(url, options);

    socket.on("connect", () => {
      socket.on("subscription_registered", (message) => {
        console.log("registered", message);
      });

      socket.on("subscription_connected", (message) => {
        console.log("subscription_connected", message);

        // Emit a subscription message with your specific messageId, eventType, and parameters.
        socket.emit("subscription", messageId, eventType, JSON.stringify(params));
      });

      socket.on("subscription_error", (message) => {
        console.error(`nodit_subscription_error: ${message}`);
      });

      socket.on("subscription_event", (message) => {
        console.log("subscription Event : ", message);
      });

      socket.on("disconnect", (message) => {
        console.warn(`disconnect`, message);
      });

      resolve(socket);
    });

    socket.on("connect_error", (error) => {
      console.error(`Socket connection error to : `, error);
      reject(error);
    });
  });
}

connectToServer();

node your_file_name.js

subscriptionId: 97139
subscription Event :
  eventType: "BLOCK_PERIOD",
  event: {
    "period":1,
    "message":{
      "number":17767702,
      "hash":"0x836c2ada70123019592fc52763757c87061935bbab2609d2dac1d0e9a93a6186",
      "parent_hash":"0xc8936f4c504b1640df7e1c920dbd1879a0906c7d44cf369d7f26b2939bfa2864",
      "nonce":"0x0000000000000000",
      "sha3_uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
      "logs_bloom":"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",
      "transactions_root":"0xed72506de019800931029aa7f4efdb255b9a6c2ebab2751afd98e3d2875e4159",
      "state_root":"0x35ee38917ecf6a96f9512690b4717002f233dd0dfe08f404097c0eff91f4aa20",
      "receipts_root":"0x59f4b1fc17aa8e408eec5377f4b37314333476229b350fe4b4549868ba8c7fdc",
      "miner":"0x1f9090aae28b8a3dceadf281b0f12828e676c326",
      "difficulty":0,
      "total_difficulty":5.875000371659836e+22,
      "size":58801,
      "extra_data":"0x7273796e632d6275696c6465722e78797a",
      "gas_limit":30000000,
      "gas_used":11663189,
      "timestamp":1690258955,
      "transaction_count":107,
      "base_fee_per_gas":17895212572
    }
  }