var Web3 = require('web3');
var web3 = new Web3(new Web3.providers.IpcProvider("\\.\pipe\geth.ipc", require("net")));

web3.setProvider(new web3.providers.IpcProvider("\\.\pipe\geth.ipc", require("net")));

var subscription = web3.eth.subscribe('pendingTransactions', function(error, result){
if (!error)
    console.log(result);
else
    console.log(error);
})
.on("data", function(transaction){
    console.log(transaction);
});