Kraken Derivatives JavaScript SDK example: publicWs.ts
Kraken Derivatives public websocket JavaScript example for the Siebly Kraken SDK, covering exchange REST API and WebSocket integration, setup, and production SDK docs.
We use environment variables in our examples for API keys. It is your responsibility to manage and secure your keys appropriately.
examples/Kraken/Derivatives/WebSockets/publicWs.ts
What this example covers
- Kraken WebSocket stream JavaScript example.
- Uses the Siebly Kraken SDK package
@siebly/kraken-apiinstead of hand-written WebSocket plumbing. - Source path:
Kraken/Derivatives/WebSockets/publicWs.ts. - Example category: Derivatives.
- Imports SDK symbols including
DefaultLogger,WebsocketClient,WS_KEY_MAP. - Calls SDK methods such as
on(),subscribe().
How to use this example
- Start here for the specific request or stream pattern, then check the matching SDK guide for install, credentials, and operational notes.
- For WebSocket examples, keep reconnect, resubscribe, heartbeat, and event-handler behavior explicit in your service.
- Open the repository source when you need the latest committed version: GitHub source file.
/* eslint-disable @typescript-eslint/no-unused-vars */import { DefaultLogger, LogParams, WebsocketClient, WS_KEY_MAP, WSTopicRequest,} from '@siebly/kraken-api';import { WSDerivativesTopic } from '@siebly/kraken-api'; const customLogger: DefaultLogger = { // eslint-disable-next-line @typescript-eslint/no-unused-vars trace: (...params: LogParams): void => { // console.log(new Date(), '--> trace', ...params); }, info: (...params: LogParams): void => { console.log(new Date(), '--> info', ...params); }, error: (...params: LogParams): void => { console.error(new Date(), '--> error', ...params); },}; async function start() { /** * The WebsocketClient is the core class to manage WebSocket subscriptions. Give it the topics you want to subscribe to, and it will handle the rest: * - Connection management (connect, disconnect, reconnect) * - Authentication for private topics * - Subscription management (subscribe, unsubscribe, resubscribe on reconnect) * - Message handling (dispatch messages to appropriate handlers) * * All you need to do is provide the topics you want to subscribe to when calling `subscribe()`, and the client will take care of the rest. * * Here we create a WebsocketClient instance without API key/secret, since we're only connecting to public topics. * * In terms of product groups such as Spot, Derivatives, etc., the WebsocketClient understand the product group from the WsKey you provide when subscribing. For example, using `WS_KEY_MAP.spotPrivateV2` indicates that the subscription is for Spot private topics, as shown below. * * Refer to WS_KEY_MAP in the source code for all available WsKey options. */ const client = new WebsocketClient( { // apiKey: key, // apiSecret: secret, }, customLogger, ); client.on('open', (data) => { console.log(new Date(), 'connected ', data?.wsKey); }); // Data received client.on('message', (data) => { console.info(new Date(), 'data received: ', JSON.stringify(data)); }); // Something happened, attempting to reconnect client.on('reconnecting', (data) => { console.log(new Date(), 'reconnect: ', data?.wsKey); }); // Reconnect successful client.on('reconnected', (data) => { console.log(new Date(), 'reconnected: ', data?.wsKey); }); // Connection closed. If unexpected, expect reconnect -> reconnected. client.on('close', (data) => { console.error(new Date(), 'close: ', data); }); // Reply to a request, e.g. "subscribe"/"unsubscribe"/"authenticate" client.on('response', (data) => { console.info(new Date(), 'server reply: ', JSON.stringify(data), '\n'); }); client.on('exception', (data) => { console.error(new Date(), 'exception: ', data); }); client.on('authenticated', (data) => { console.error(new Date(), 'authenticated: ', data); }); /** * The below examples demonstrate how you can subscribe to public topics. * * Do note that all of these include the "derivativesPublicV1" WsKey reference. This tells the WebsocketClient to use the private "wss://futures.kraken.com/ws/v1" endpoint for these private subscription requests. It will also automatically authenticate the connection when it is established. */ try { // Ticker: https://docs.kraken.com/api/docs/futures-api/websocket/ticker const publicTickerTopicRequest: WSTopicRequest<WSDerivativesTopic> = { topic: 'ticker', payload: { product_ids: ['PI_XBTUSD', 'PI_ETHUSD'], }, }; // client.subscribe(publicTickerTopicRequest, WS_KEY_MAP.derivativesPublicV1); // Ticker Lite: https://docs.kraken.com/api/docs/futures-api/websocket/ticker const publicTickerLiteTopicRequest: WSTopicRequest<WSDerivativesTopic> = { topic: 'ticker_lite', payload: { product_ids: ['PI_XBTUSD', 'PI_ETHUSD'], }, }; // client.subscribe( // publicTickerLiteTopicRequest, // WS_KEY_MAP.derivativesPublicV1, // ); // Book: https://docs.kraken.com/api/docs/futures-api/websocket/ticker const publicBookTopicRequest: WSTopicRequest<WSDerivativesTopic> = { topic: 'book', payload: { product_ids: ['PI_XBTUSD', 'PI_ETHUSD'], }, }; // client.subscribe(publicBookTopicRequest, WS_KEY_MAP.derivativesPublicV1); // Trade: https://docs.kraken.com/api/docs/futures-api/websocket/ticker const publicTradeTopicRequest: WSTopicRequest<WSDerivativesTopic> = { topic: 'trade', payload: { product_ids: ['PI_XBTUSD', 'PI_ETHUSD'], }, }; client.subscribe(publicTradeTopicRequest, WS_KEY_MAP.derivativesPublicV1); } catch (e) { console.error('Req error: ', e); }} start();