Node.js API wrapper to the OKCoin bitcoin exchange

A node.js wrapper for the REST APIs exposed by bitcoin exchange OKCoin. You will need have a registered account with OKCoin and generated API keys to access the private methods.

Please contact [email protected] if you are having trouble opening and account or generating an API key.

Install

npm install z_okcoin

Design Principles

• thin the client is just a simple wrapper to the OKCoin API. There is no parameter validation as this is delegated to the OKCoin API server. Similarly, there is no data transformation.
• errors all errors are returned as detailed Error objects which can be used programatically or for support
• no retries it's up to the calling program to handle retries as it'll vary between programs. For example, error handling timeouts on mutable API calls like addTrade and cancelOrder is not as simple as retying the API call as the operation my have been successful on the exchange but the response back was not.

Error handling

The first parameter to each API function is a callback function which is passed error and data objects.

The error object is an instance of VError which is an extension of the standard Error object. The three main properties are:

• message a description of the error with all the available information so problems in production can be diagnosed. For example the url, http request method, parameters, error codes and messages
• name the HTTP or OKCoin error code so specific errors can be programatically detected. For example, 503 if you are sending too many requests per second or 10010 if there is not enough funds to add a trade
• cause the underlying error object. eg the error object from a failed request or json parse. Note there will be no cause error for OKCoin errors

Examples

var OKCoin = require('z_okcoin');

// Test public data APIs
var publicClient = new OKCoin();

// get BTCUSD ticker
publicClient.getTicker(console.log, 'btc_usd');

// get BTCUSD order book
publicClient.getDepth(console.log, 'btc_usd');

// get trades defaulting to BTCUSD
publicClient.getTrades(console.log);

// replace the parameters with your API key and secret
var privateClient = new OKCoin('your-api-key', 'your-api-secret');

privateClient.getUserInfo(console.log);

// buy limit order for 0.01 BTC at price 100 USD
privateClient.addTrade(console.log, 'btc_usd', 'buy', '0.01', '100');
// sell limit order for 0.01 BTC at price 900 USD
privateClient.addTrade(console.log, 'btc_usd', 'sell', '0.01', '900');

// market buy of 25 USD
privateClient.addTrade(console.log, 'btc_usd', 'buy_market', null, '25');
// market sell of 0.01 BTC
privateClient.addTrade(console.log, 'btc_usd', 'sell_market', '0.01');

privateClient.cancelOrder(console.log, 'btc_usd', 31234567);

// get all open orders
privateClient.getOrderInfo(console.log, 'btc_usd', '-1');

// get the first 20 unfilled orders
privateClient.getOrderHistory(console.log, 'btc_usd', 0, 1, 20);
// get the third 20 filled orders
privateClient.getOrderHistory(console.log, 'btc_usd', 1, 3, 20);

// get the first 5 account deposits
privateClient.getAccountRecords(console.log, 'btc_usd', 0, 1, 5);
// get the first 5 account withdrawals
privateClient.getAccountRecords(console.log, 'btc_usd', 1, 1, 5);

Please see the exmaples.js file for more examples