[Ethereum] Error Truffle Console: web3.fromWei is not a function

truffletruffle-console

I am executing commands from a tutorial at:

I am executing the command:

> truffle(ganache)> balanceInEth = address =>
> web3.fromWei(getBalance(address).toString())

I am getting the message:

[Function: balanceInEth] truffle(ganache)>
balanceInEth(victim.address) evalmachine.:0 balanceInEth =
address => web3.fromWei(getBalance(address).toString())
^

TypeError: web3.fromWei is not a function
at balanceInEth (evalmachine.:0:32)
at evalmachine.:0:1
at sigintHandlersWrap (vm.js:98:15)
at ContextifyScript.Script.runInContext (vm.js:56:12)
at runScript (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:465120:21)

Somebody please guide me.

Zulfi.

Best Answer

As @goodvibration mentioned, you must be using web3.js v1 So you should use web3.utils.fromWei method instead But you also need to use the await prefix before getBalance, because getBalance return a promise which fromWei doesn't understand So my sugestion end up being like this

truffle(ganache)> web3.eth.getAccounts(function(err, acc) { accounts = acc });
truffle(ganache)> const boo = async () => { return web3.utils.fromWei(await web3.eth.getBalance(accounts[0]), 'ether'); }
truffle(ganache)> boo()
'99.0015542'

Related Solutions

[Ethereum] Cannot read property ‘call’ of undefined

Just do

HelloWorld.deployed().balance.call()

[Ethereum] Invalid JSON RPC response error for sendTransaction on Infura + Ropsten node + Truffle console

Let me post the complete answer here (Credits to @Ismael).

Relevant packages -
web3@0.18.2
ethereumjs-tx@1.3.3
crypto-js

const Web3 = require('web3')  
let web3 = new Web3()  
web3.providers.HttpProvider('https://ropsten.infura.io/my_access_token_here'))  
let contract = web3.eth.contract(abi).at(address)  
var coder = require('web3/lib/solidity/coder')  
var CryptoJS = require('crypto-js')  
var privateKey = new Buffer(myPrivateKey, 'hex')  

var functionName = 'addRecord'  
var types = ['uint','bytes32','bytes20','bytes5','bytes']  
var args = [1, 'fjdnjsnkjnsd', '03:00:21 12-12-12', 'true', '']  
var fullName = functionName + '(' + types.join() + ')'  
var signature = CryptoJS.SHA3(fullName,{outputLength:256}).toString(CryptoJS.enc.Hex).slice(0, 8)  
var dataHex = signature + coder.encodeParams(types, args)  
var data = '0x'+dataHex  

var nonce = web3.toHex(web3.eth.getTransactionCount(account))  
var gasPrice = web3.toHex(web3.eth.gasPrice)  
var gasLimitHex = web3.toHex(300000) (user defined)  
var rawTx = { 'nonce': nonce, 'gasPrice': gasPrice, 'gasLimit': gasLimitHex, 'from': account, 'to': address, 'data': data}  
var tx = new Tx(rawTx)  
tx.sign(privateKey)  
var serializedTx = '0x'+tx.serialize().toString('hex')  
web3.eth.sendRawTransaction(serializedTx, function(err, txHash){ console.log(err, txHash) })

(Returns '0xf802614fd6a53cb372752634630265063d0b48fec12ea8f5ed363de1d4bd372d')

web3.eth.getTransaction('0xf802614fd6a53cb372752634630265063d0b48fec12ea8f5ed363de1d4bd372d', console.log)

(Prints transaction data)
(Refer here)

Best Answer

Related Solutions

[Ethereum] Cannot read property ‘call’ of undefined

[Ethereum] Invalid JSON RPC response error for sendTransaction on Infura + Ropsten node + Truffle console

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