app.js

 // npm install web3
 var Web3 = require('web3');
 var web3 = new Web3('wss://ropsten.infura.io/ws');
 console.log(web3.version)
 
 // 0x9490d2d67f5455d6b1772a928cb1f3f05f2db32a
 var privateKey = '0x1A6EDBD9EC44934671718982671A2E2B7A2573430BFEACEA65EB54E7F765442E';
 
 var weiValue = web3.utils.toWei('0.001', 'ether');
 
 var tx = {
 	to: '0x14ef8277775c680ac000443e9bde9dbb74a7ee74',
 	value: weiValue,
 	gasPrice: 20000000000,
 	gas: 2000000	
 }
 
 web3.eth.accounts.signTransaction(tx, privateKey, function(error, result) {
 	console.log(error);
 	console.log(result);
 });