Error when estimating contract deployment fee using web3.eth.estimateGas

Question

When I run the code line below:

let gasEstimate = web3.eth.estimateGas({from:myAddress, data: bytecode})

got and error:

> Error: Node error: {"code":-32000,"message":"gas required exceeds allowance (8000000) or always failing transaction"}

How fix it? many thanks.

Answer 1

I hope this will work for you,

const contract = new web3.eth.Contract(abi);

const estimateGas = await contract.deploy({
  data: bytecode
}).estimateGas();

contract.deploy({
  data: bytecode,
  arguments: ['TestToken', 'Token', 18, '1000000000000000000000']
})
.send({
  from: yourAddress,
  gas: estimateGas,
})
.on('error', (error) => {
  console.log(error)
})
.on('transactionHash', (transactionHash) => {
  console.log(transactionHash)
});