KuCoin Auth JavaScript SDK example: fasterHmacSign.ts
KuCoin Auth faster hmac sign JavaScript example for the Siebly KuCoin 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/Kucoin/Auth/fasterHmacSign.ts
What this example covers
- KuCoin authentication and request-signing JavaScript example.
- Uses the Siebly KuCoin SDK package
kucoin-apiinstead of hand-written signing code. - Source path:
Kucoin/Auth/fasterHmacSign.ts. - Example category: Auth.
- Imports SDK symbols including
DefaultLogger,SpotClient,WebsocketClient. - Calls SDK methods such as
on(),subscribe(),getBalances().
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 private or order-management examples, keep credentials in environment variables or a secret manager. Use read-only keys where possible, and check the execution mode reference before any exchange write path can run.
- Open the repository source when you need the latest committed version: GitHub source file.
import { createHmac } from 'crypto';import { DefaultLogger, SpotClient, WebsocketClient } from 'kucoin-api'; // import { DefaultLogger, SpotClient, WebsocketClient } from 'kucoin-api'; /** * Injecting a custom signMessage function. * * As of version 3.0.0 of the kucoin-api Node.js/TypeScript/JavaScript * SDK for Kucoin, the SDK uses the Web Crypto API for signing requests. * While it is compatible with Node and Browser environments, it is * slightly slower than using Node's native crypto module (only * available in backend Node environments). * * For latency sensitive users, you can inject the previous node crypto sign * method (or your own even faster implementation), if this change affects you. * * This example demonstrates how to inject a custom sign function, to achieve * the same peformance as seen before the Web Crypto API was introduced. * * For context on standard usage, the "signMessage" function is used: * - During every single API call * - After opening a new private WebSocket connection */ const apiKey = process.env.API_KEY_COM;const apiSecret = process.env.API_SECRET_COM;const apiPass = process.env.API_PASS_COM; const restClient = new SpotClient({ apiKey: apiKey, apiSecret: apiSecret, apiPassphrase: apiPass, /** * Overkill in almost every case, but if you need any optimisation available, * you can inject a faster sign mechanism such as node's native createHmac: */ customSignMessageFn: async (message, secret) => { return createHmac('sha256', secret).update(message).digest('hex'); },}); // Optional, uncomment the "trace" override to log a lot more info about what the WS client is doingconst customLogger = { ...DefaultLogger, // trace: (...params) => console.log('trace', ...params),}; const wsClient = new WebsocketClient( { apiKey: apiKey, apiSecret: apiSecret, apiPassphrase: apiPass, /** * Overkill in almost every case, but if you need any optimisation available, * you can inject a faster sign mechanism such as node's native createHmac: */ customSignMessageFn: async (message, secret) => { return createHmac('sha256', secret).update(message).digest('hex'); }, }, customLogger,); function setWsClientEventListeners( websocketClient: WebsocketClient, accountRef: string,): Promise<void> { return new Promise((resolve) => { websocketClient.on('update', (data) => { console.log(new Date(), accountRef, 'data ', JSON.stringify(data)); // console.log('raw message received ', JSON.stringify(data, null, 2)); }); websocketClient.on('open', (data) => { console.log( new Date(), accountRef, 'connection opened open:', data.wsKey, ); }); websocketClient.on('response', (data) => { console.log( new Date(), accountRef, 'log response: ', JSON.stringify(data, null, 2), ); if (typeof data.req_id === 'string') { const topics = data.req_id.split(','); if (topics.length) { console.log(new Date(), accountRef, 'Subscribed to topics: ', topics); return resolve(); } } }); websocketClient.on('reconnect', ({ wsKey }) => { console.log( new Date(), accountRef, 'ws automatically reconnecting.... ', wsKey, ); }); websocketClient.on('reconnected', (data) => { console.log(new Date(), accountRef, 'ws has reconnected ', data?.wsKey); }); websocketClient.on('exception', (data) => { console.error(new Date(), accountRef, 'ws exception: ', data); }); });} (async () => { try { const onSubscribed = setWsClientEventListeners(wsClient, 'testAccount1'); wsClient.subscribe( [ '/market/match:BTC-USDT', '/spotMarket/tradeOrders', '/spotMarket/tradeOrdersV2', '/account/balance', '/spotMarket/advancedOrders', ], 'spotPrivateV1', ); // Simple promise to ensure we're subscribed before trying anything else await onSubscribed; // Start trading const balResponse1 = await restClient.getBalances(); console.log('balResponse1: ', JSON.stringify(balResponse1, null, 2)); } catch (e) { console.error('request failed: ', e); }})();