I'm currently using 0.2x.x version of Web3 Javascript API. I deployed my custom ERC20 token by creating smart contract in solidity (on REMIX IDE). I installed the MetaMask and had a test on https://wallet.ethereum.org/ to send some custom ERC t...

I started learning ethereum and web3js and noticed some functions on Web3js are asynchronous. What i want to achieve is get the account balance of a wallet and use the data for something else. My code below  function getAccountBalance2(address){...

I have an issue with transactions on my local ethereum network - at some point, transaction hangs & spends a lot of ETH from my account.     Here's a sample code:  async function send(toAccount, weiVal) {   let account = await w3.getDefAccoun...

I have a node js process that creates a web3 websocket connection, like so:  web3 = new Web3('ws://localhost:7545')   When the process completes (I send it a SIGTERM), it does not exit, but rather hangs forever with no console output.  I regi...

not sure if I should post this on the Ethereum SE but I have a feeling it is more javascript related, so I'll try here:   I have a very simple smart contract that consists of essentially just a getNum function and a setNum function.  The smart co...

Problem  I would like to have a website that updates live the user's wealth from a private Ethereum blockchain.   Current Solution (broken)  I opened a websocket to a private ethereum blockchain that is mining, I would like to update my coinbase...

I'm developing a website using Web3 with Metamask, users can purchase tokens by sending ETH to an address. What I want to have done is that after the ETH is received it sends the tokens to the users ETH address automatically with backend code.  T...

This is a follow up to these threads:  How to set state of a react component with a specific item from a returned json object?  How to return json data to a react state?  I am using web3 to sign a transaction on Ethereum, which then sends a json obje...

Context: I want to use blockies to render an identicon on the page, i get the defaultAccount from web3, for this, the user has to be logged on to metamask with a selected address from his wallet.   The problem: the web app seems to not detect the web...

I've tried to run the following snippet, but to no avail.  I found the snippet here.   var Web3PromiEvent = require('web3-core-promievent');  var myFunc = function(){     var promiEvent = Web3PromiEvent();      setTimeout(function() {...