Here is my code. I am trying to send ether from one account to another.

var Tx     = require('ethereumjs-tx')
const Web3 = require('web3')
const web3 = new Web3('https://ropsten.infura.io/v3/1ac73a4112ab456cb5bdd3ac33e4fe82')

const account1 = '<Account 1>'
const account2 = '<Account 2>'

const k1 = Buffer.from('<Private key 1>','hex')
const k2 = Buffer.from('<Private key 2>','hex')

    //building a transaction
    const txObject = {
    nonce:    web3.utils.toHex(txCount),
    to:       account2,
    value:    web3.utils.toHex(web3.utils.toWei('0.1', 'ether')),
    gasLimit: web3.utils.toHex(21000),
    gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei'))

  // Sign the transaction
  const tx = new Tx(txObject)

  const serializedTx = tx.serialize()
  const raw = '0x' + serializedTx.toString('hex')

  // Broadcast the transaction
  web3.eth.sendSignedTransaction(raw, (err, txHash) => {
    console.log('txHash:', txHash)

The error thrown is as follows:

UnhandledPromiseRejectionWarning: TypeError: Tx is not a constructor at GetTransactionCountMethod.web3.eth.getTransactionCount (C:\Users\Atul\Web3_code\send_transaction.js:22:14) at GetTransactionCountMethod._callee$ (C:\Users\Atul\node_modules\web3-core-method\dist\web3-core-method.cjs.js:126:22) at tryCatch (C:\Users\Atul\node_modules\regenerator-runtime\runtime.js:45:40) at Generator.invoke [as _invoke] (C:\Users\Atul\node_modules\regenerator-runtime\runtime.js:271:22) at Generator.prototype.(anonymous function) [as next] (C:\Users\Atul\node_modules\regenerator-runtime\runtime.js:97:21) at asyncGeneratorStep (C:\Users\Atul\node_modules@babel\runtime\helpers\asyncToGenerator.js:3:24) at _next (C:\Users\Atul\node_modules@babel\runtime\helpers\asyncToGenerator.js:25:9) at process._tickCallback (internal/process/next_tick.js:68:7) (node:10632) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:10632) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I'm extremely new to this. Pls help.


In the new version you should


const Tx = require('ethereumjs-tx')


const Tx = require('ethereumjs-tx').Transaction
  • 1
    Thanks that worked – Atul Anand Jul 19 '19 at 8:01
  • 1
    You're welcome! Our pleasure! Please accept the answer then other people can know when they face the same issue :) – Ha ĐANG Jul 19 '19 at 8:12
  • 1
    You're a hero @HaĐANG, but do you have where this change is documented? This wasted a couple hours of my time before finding this question. Google is now the worst for searching because of their quest for propaganda, I had to go 15 pages deep on Bing. This answer should be #1. – ThickMiddleManager Jul 23 '19 at 15:53
  • Thank you for nice words. I don’t have the document. Just look into the latest code to understand:) – Ha ĐANG Jul 24 '19 at 14:01

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.