Node.js & JavaScript SDK for Kucoin REST APIs, WebSockets & WebSocket API

Updated & performant JavaScript & Node.js SDK for the Kucoin REST APIs and WebSockets:

• Complete integration with all Kucoin REST APIs and WebSockets.
• TypeScript support (with type declarations for most API requests & responses)
• Robust WebSocket integration with configurable connection heartbeats & automatic reconnect then resubscribe workflows.
• Browser-friendly HMAC signature mechanism.
• Automatically supports both ESM and CJS projects.
• Proxy support via axios integration.
• Active community support & collaboration in telegram: Node.js Algo Traders.

Installation

npm install --save kucoin-api

Issues & Discussion

• Issues? Check the issues tab.
• Discuss & collaborate with other node devs? Join our Node.js Algo Traders engineering community on telegram.

Related projects

Check out my related JavaScript/TypeScript/Node.js projects:

• Try my REST API & WebSocket SDKs:
  • Bybit-api Node.js SDK
  • Okx-api Node.js SDK
  • Binance Node.js SDK
  • Gateio-api Node.js SDK
  • Bitget-api Node.js SDK
  • Bitmart-api Node.js SDK
• Try my misc utilities:
  • OrderBooks Node.js
  • Crypto Exchange Account State Cache
• Check out my examples:
  • awesome-crypto-examples Node.js

Documentation

Most methods accept JS objects. These can be populated using parameters specified by Kucoin's API documentation.

• Kucoin API Documentation

• Node.js Quick Start Guides

  • Spot Node.js Kucoin Quick Start Guide
  • Futures Node.js Kucoin Quick Start Guide

• Futures Node.js Kucoin Order Placement Guide

• REST Endpoint Function List

Structure

This project uses typescript. Resources are stored in 2 key structures:

• src - the whole connector written in typescript
• examples - some implementation examples & demonstrations. Contributions are welcome!

Usage

Create API credentials

• Kucoin API Key Management

REST API

To use any of Kucoin's REST APIs in JavaScript/TypeScript/Node.js, import (or require) the SpotClient (for spot and margin APIs) or FuturesClient (for futures APIs):

const { SpotClient, FuturesClient } = require('kucoin-api');

const client = new SpotClient({
  apiKey: 'apiKeyHere',
  apiSecret: 'apiSecretHere',
  apiPassphrase: 'apiPassPhraseHere',
});

try {
  const spotBuyResult = await client.submitOrder({
    clientOid: client.generateNewOrderID(),
    side: 'buy',
    type: 'market',
    symbol: 'BTC-USDT',
    size: '0.00001',
  });
  console.log('spotBuy ', JSON.stringify(spotBuyResult, null, 2));

  const spotSellResult = await client.submitOrder({
    clientOid: client.generateNewOrderID(),
    side: 'sell',
    type: 'market',
    symbol: 'BTC-USDT',
    size: '0.00001',
  });
  console.log('spotSellResult ', JSON.stringify(spotSellResult, null, 2));
} catch (e) {
  console.error(`Req error: `, e);
}

See SpotClient and FuturesClient for further information, or the examples for lots of usage examples.

WebSockets

All available WebSockets can be used via a shared WebsocketClient. The WebSocket client will automatically open/track/manage connections as needed. Each unique connection (one per server URL) is tracked using a WsKey (each WsKey is a string - see WS_KEY_MAP for a list of supported values).

Any subscribe/unsubscribe events will need to include a WsKey, so the WebSocket client understands which connection the event should be routed to. See examples below or in the examples folder on GitHub.

Data events are emitted from the WebsocketClient via the update event, see example below:

const { WebsocketClient } = require('kucoin-api');

const client = new WebsocketClient();

client.on('open', (data) => {
  console.log('open: ', data?.wsKey);
});

// Data received
client.on('update', (data) => {
  console.info('data received: ', JSON.stringify(data));
});

// Something happened, attempting to reconenct
client.on('reconnect', (data) => {
  console.log('reconnect: ', data);
});

// Reconnect successful
client.on('reconnected', (data) => {
  console.log('reconnected: ', data);
});

// Connection closed. If unexpected, expect reconnect -> reconnected.
client.on('close', (data) => {
  console.error('close: ', data);
});

// Reply to a request, e.g. "subscribe"/"unsubscribe"/"authenticate"
client.on('response', (data) => {
  console.info('response: ', data);
  // throw new Error('res?');
});

client.on('exception', (data) => {
  console.error('exception: ', {
    msg: data.msg,
    errno: data.errno,
    code: data.code,
    syscall: data.syscall,
    hostname: data.hostname,
  });
});

try {
  // Optional: await a connection to be ready before subscribing (this is not necessary)
  // await client.connect('futuresPublicV1');

  /**
   * Examples for public futures websocket topics (that don't require authentication).
   *
   * These should all subscribe via the "futuresPublicV1" wsKey. For detailed usage, refer to the ws-spot-public.ts example.
   */
  client.subscribe(
    [
      '/contractMarket/tickerV2:XBTUSDM',
      '/contractMarket/ticker:XBTUSDM',
      '/contractMarket/level2:XBTUSDM',
      '/contractMarket/execution:XBTUSDM',
      '/contractMarket/level2Depth5:XBTUSDM',
      '/contractMarket/level2Depth50:XBTUSDM',
      '/contractMarket/limitCandle:XBTUSDTM_1hour',
      '/contract/instrument:XBTUSDM',
      '/contract/announcement',
      '/contractMarket/snapshot:XBTUSDM',
    ],
    'futuresPublicV1',
  );
} catch (e) {
  console.error(`Subscribe exception: `, e);
}

See WebsocketClient for further information and make sure to check the examples folder for much more detail, especially ws-spot-public.ts, which explains a lot of detail.

Customise Logging

Pass a custom logger which supports the log methods trace, info and error, or override methods from the default logger as desired.

const { WebsocketClient, DefaultLogger } = require('kucoin-api');

// E.g. customise logging for only the trace level:
const logger = {
  // Inherit existing logger methods, using an object spread
  ...DefaultLogger,
  // Define a custom trace function to override only that function
  trace: (...params) => {
    if (
      [
        'Sending ping',
        // 'Sending upstream ws message: ',
        'Received pong',
      ].includes(params[0])
    ) {
      return;
    }
    console.log('trace', JSON.stringify(params, null, 2));
  },
};

const ws = new WebsocketClient(
  {
    apiKey: 'apiKeyHere',
    apiSecret: 'apiSecretHere',
    apiPassphrase: 'apiPassPhraseHere',
  },
  logger,
);

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Contributions & Pull Requests

Contributions are encouraged, I will review any incoming pull requests. See the issues tab for todo items.

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