How do I pass arguments to a contract-constructor with web3Js (>=version 1.0)

External question — Ethereum Stack Exchange Author: hardfork Original post: https://ethereum.stackexchange.com/questions/41757 License: CC BY-SA 3.0 — https://creativecommons.org/licenses/by-sa/3.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I was on https://www.myetherwallet.com/#contracts and wanted to deploy a contract. It worked with a contract with a constructor without arguments, but my contract constructor looks like this: function CrowdFunding(address _arg1, uint256 _arg2, uint256 _arg3) public { arg1 = _arg1; arg2 = _arg2; arg3 = _arg3; } But how do I pass my arguments (arg1, arg2 and arg3)? I'm using web3JS.

External answer — Ethereum Stack Exchange Author: hardfork Original post: https://ethereum.stackexchange.com/a/41771 License: CC BY-SA 3.0 — https://creativecommons.org/licenses/by-sa/3.0/ Adaptation: HTML converted to plain text; contact email addresses removed. If you are using a newer version of web3 (version 1.0.0 for example): // example solidity code function ContractName(address _arg1, uint256 _arg2, uint256 _arg3) public { arg1 = _arg1; arg2 = _arg2; arg3 = _arg3; } Use web3.eth.abi.encodeParameter() or web3.eth.abi.encodeParameters() to encode your parameters and concatenate them at the end of your bytecode. const Web3 = require("web3"); const solc = require("solc"); // compile the solidity code let compiled = solc.compile(source); // save public interface of contract let abi = JSON.parse(compiled.contracts[":ContractName"].interface) // create var with contract let CrowdFunding = new web3.eth.Contract(abi); let bytecodeWithParameters = compiled.contracts[':ContractName'].bytecode + web3.eth.abi.encodeParameters(['address', 'uint256', 'uint256'], ['0x08cf02070bb9f167556c677da58e6678bbe871fc', '100000000000000000', '10000']).slice(2); // slice(2) because we want to remove the '0x' at the beginning. Now, you can enter bytecodeWithParameters on https://www.myetherwallet.com/#contracts to deploy (with arguments).

External answer — Ethereum Stack Exchange Author: goodvibration Original post: https://ethereum.stackexchange.com/a/57587 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Try this: let fs = require("fs"); let Web3 = require("web3"); let web3 = new Web3(NODE_ADDRESS); async function send(transaction) { let gas = await transaction.estimateGas({from: PUBLIC_KEY}); let options = { to : transaction._parent._address, data: transaction.encodeABI(), gas : gas }; let signedTransaction = await web3.eth.accounts.signTransaction(options, PRIVATE_KEY); return await web3.eth.sendSignedTransaction(signedTransaction.rawTransaction); } async function deploy(contractName, contractArgs) { let abi = fs.readFileSync(contractName + ".abi").toString(); let bin = fs.readFileSync(contractName + ".bin").toString(); let contract = new web3.eth.Contract(JSON.parse(abi)); let handle = await send(contract.deploy({data: "0x" + bin, arguments: contractArgs})); console.log(`${contractName} contract deployed at address ${handle.contractAddress}`); return new web3.eth.Contract(JSON.parse(abi), handle.contractAddress); } Usage example: let crowdFunding = await deploy("CrowdFunding", [arg1, arg2, arg3]);