node-bitcoin-async

This is a Bitcoin Core JSON-RPC API client with async processing in the style of the Async Node.js module.

Note: it is a modified version of the bitcoin Node.js module. In particular it changes the way how batch RPC method calls are processed. See below for more details.

The API is equivalent to the API document here. The methods are exposed as lower camelcase methods on the bitcoin.Client object, or you may call the API directly using the cmd method.

Install

npm install @veritwin/bitcoin-async

Examples

Create client

// all config options are optional
var client = new bitcoin.Client({
  host: 'localhost',
  port: 8332,
  user: 'username',
  pass: 'password',
  wallet: 'walletname',
  timeout: 30000
});

Get balance across all accounts with minimum confirmations of 6

client.getBalance('*', 6, function(err, balance, resHeaders) {
  if (err) return console.log(err);
  console.log('Balance:', balance);
});

Getting the balance directly using cmd

client.cmd('getbalance', '*', 6, function(err, balance, resHeaders){
  if (err) return console.log(err);
  console.log('Balance:', balance);
});

Batch multiple RPC calls into single HTTP request

var batch = [];
for (var i = 0; i < 10; ++i) {
  batch.push({
    method: 'getnewaddress',
    params: ['myaccount']
  });
}
client.cmd(batch, function(address, resHeaders, cb) {
  // This function is called after a successful call for each of the RPC methods
  //  in the batch
  console.log('Address:', address);
  cb();
}, function (err) {
  // This method is called after calling all the RPC methods or whenever an error takes
  //  place while calling ony of the methods
  if (err) return console.log(err);
});

SSL

See Enabling SSL on original client.

If you're using this to connect to bitcoind across a network it is highly recommended to enable ssl, otherwise an attacker may intercept your RPC credentials resulting in theft of your bitcoins.

When enabling ssl by setting the configuration option to true, the sslStrict option (verifies the server certificate) will also be enabled by default. It is highly recommended to specify the sslCa as well, even if your bitcoind has a certificate signed by an actual CA, to ensure you are connecting to your own bitcoind.

var client = new bitcoin.Client({
  host: 'localhost',
  port: 8332,
  user: 'username',
  pass: 'password',
  ssl: true,
  sslStrict: true,
  sslCa: fs.readFileSync(__dirname + '/myca.cert')
});