Questions tagged [web3js-v1.x]

For questions specifically about version 1.x of the web3js Javascript API and library for Ethereum

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SendSignedTransaction web3 v1.0 smart contract method call

Running parity node, connected to Kovan testnet. Contract Address: 0x354Db5AE17b11fbc01A8a146B63506b1d90872E0 Using a nodejs app + web3 to send/sign transactions with the private key corresponding to ...
3
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1answer
3k views

How to connect web3.js 1.0.x to Metamask

I am using web3.js 1.0.0-beta.36 to connect to the blockchain. But unfortunately this code cannot connect to Metamask, if it has been enabled. var metamask = false; if (typeof web3 !== 'undefined') {...
3
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2answers
109 views

What happened to the official documentation of web3.js v1.0?

It should be at https://web3js.readthedocs.io/en/1.0/, but now I'm getting this: Does anybody happen to know why this wonderful tool has been taken off line?
3
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1answer
44 views
+50

How to set multiple nodes in HttpProvider web3 v1.2.0

I'm working with Nodejs application, and using a multi-node setup on different servers. If I have single node end point like http://localhost:8545 I can use Web3 providers as below var web3 = new Web3(...
2
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1answer
244 views

Which version of web3 shall i be using now?

I found the documentation of version 1.0.0 which was released on the 6th of August here. I was told that v1 is not stable and very different than earlier versions. But when i check the available ...
2
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3answers
756 views

How to check if the address is an ERC20 contract?

edit) VM execution error was a bug on Web3, confirmed my code works fine. I am trying to fetch random addresses from blockchain and trying to categorize them if it is an ERC20 contract address or not....
2
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2answers
132 views

Web3js events “fromBlock: 0” doesnt work

I want to get events from block X. I have: quorum-v2.4.0 web3js 1.2.6 And I have my own smart contracts I want to listen for. So I have created listener for allEvents like this: const event = ...
2
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1answer
158 views

Clarification on “password” argument for web3.eth.personal.sign

Context: I'm fairly new to web3, and as we all know it's developing quite regularly. I'm working towards a "sign in with Metamask"-type functionality using web3@1.0.0-beta.46. Most of the docs/...
2
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0answers
233 views

using events in private blockchain raises leveldb not found error

i'm getting { [Error: Node error: {"code":-32000,"message":"leveldb: not found"}] when trying to use events on a private eth blockhain. What might be the problem? (I've installed Leveldb with brew) ...
1
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1answer
1k views

Contract.methods.transfer is a not a function error using web3

Running something simple as this: Contract = new web3.eth.Contract(this.contractABI, this.contractAddress) Contract.methods.transfer(toAccount.address, transfferAmount).encodeABI() Gives me ...
1
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1answer
125 views

Web3js 1.0 events: closing the contract.events “socket”

My code is the following: contract.events.Deposit({}, function (err, event) { if (err) { console.error; } else { console.log(event.blockNumber); } }) .on('data', ...
1
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1answer
1k views

How to deploy a smart contract using Infura and web3js@1.x.x on NodeJS?

I have an application written in NodeJS that each time it starts has to deploy a smart contract. Once the contract is deployed this application will interact with it making some transactions and ...
1
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1answer
31 views

How to get balance of an address using web3js

Here is a very simple code that i am using :- let web3 = new Web3(new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/XXXXX")); var balance; web3.eth.getBalance("...
1
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1answer
37 views

Accessing contract functions from web3 and javascript

I have deployed a contract in a private blockchain using remix and ganache. Now I want to interact with it trough web3 and the console from my browser, but I'm not managing to interact with the ...
1
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1answer
24 views

What's the max number allowed as nonce? [duplicate]

I tried to generate nonce using this formula, so I can avoid 'underpriced' problem and nonce conflicts nonce: web3.utils.toHex( Math.round (Date.now() / 1000 - 1586000000) ), But simply these ...
1
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1answer
56 views

How can you work around Web3 1.0s bug to check for transaction confirmation?

The following includes a null Tx id: web3.eth.getTransaction('0x2fc36f9c6593bc1232b3466832c6ee38b5b2b3b4a54be3f6c68fb06e8d82e452', function(error, result){ if (!error) { console.log(result....
1
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1answer
570 views

How Can You Find the Ethereum Provider on Web3 Browsers Other Than MetaMask?

MetaMask provides the following way currently to find a provider for their upcoming 2020 breaking change: // Running on the page, in the browser // This API will go live in Q1 2020 // It will be the ...
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2answers
96 views

How to provide data for sendTransaction using web3.js 1.0

I'm using web3.js 1.0. I want to use sendTransaction method to call a contract method, but I don't know how to provide data parameter for it. For example suppose we have a contract named myContract ...
1
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2answers
998 views

Web3 CDN error: regeneratorRuntime is not defined

When I include the web3 js CDN to my html file, I receive this error web3.min.js:1 Uncaught ReferenceError: regeneratorRuntime is not defined at Object.<anonymous> (web3.min.js:1) Here is ...
1
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1answer
315 views

How do I asynchronously wait for Contract.events.MyEvent data to be returned in Web3 1.0?

The documentation is sparse, and the examples all mix async, arrow callbacks, and promises. One problem I've run into is while subscribing to an event, I can't seem use asynchronous syntax within or ...
1
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2answers
319 views

Why web3.version.api shows undefined for web3 1.0 and not undefined for web3 0.20.3?

I'm trying to use MetaMask and web3js to talk to my smart contract. Below are my test codes. This is without defining a web3 js file and I get the result "0.20.3" at console. <script> window....
1
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1answer
188 views

What's the difference between web3.eth.personal and web3.eth.accounts?

I noticed that web3.eth.personal has unlockAccount method but not web3.eth.accounts. Why not? Is web3.eth.personal for personal or single account use while web3.eth.accounts for multiple accounts?
1
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1answer
143 views

Web3 .call not returning “valid value”

Low level function calls work in Truffle, Solidity is not the problem. Other method invocations are working with the JS and HTML. This is my first attempt at using .call instead of .send; I am not ...
1
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1answer
47 views

Scope in events in web3 1.0 [closed]

Inside the callback of an event, how do I get the scope outside the function? Specifically, in the following scenario, I want the web3 object: (using truffle-contracts and web3 1.0 here) ... const ...
1
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1answer
45 views

Uncaught TypeError: Cannot read property 'fromWei' of undefined, working good in one tab and failing in another tab

I'm getting this error when I'm trying to convert Wei to Ether using the code window.web3.utils.fromWei("200000",'ether'). This error shows only on the single page and when I console.log in the same ...
1
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0answers
203 views

Help me fix Error: No “from” address specified in neither the given options, nor the default options. I'm use MetaMask

file web3.js import Web3 from 'web3'; const web3 = new Web3(window.web3.currentProvider); export default web3; file image.js import web3 from './web3'; const address = '...
1
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0answers
209 views

Solidity calldata for an array of structs

I'm trying to create the calldata offchain for an on-chain low-level call to a method that accepts an array of structs as an argument. I'm not sure how to encode the calldata for this. Here's a ...
1
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2answers
184 views

Insufficient funds when transferring ERC-20 token using web3

I am trying to send an ERC-20 token on Mainnet using web3 v1.x and Infura. I get the error in the title while executing this code. I have a balance of about 0.14 ETH var provider = new ...
1
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1answer
185 views

miner.start() is not a function?

"web3": "^1.0.0-beta.37" "web3": "^1.0.0-beta.55" import {Miner} from 'web3-eth-miner'; then const options = { defaultAccount: "0x78dB3e2129D58685444989dD9682DDDC70dd3C82", ...
1
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1answer
43 views

using web3 1.0 for approving signed transaction before appending to the blockchain

I am making a dapp using web3 1.0. I have a contract that stores medical data for every patient (represented by account). Their medical data can be set by doctor (account address) using the set ...
1
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1answer
159 views

Cannot deploy contract

I'm having difficulty deploying a solc-compiled contract to ganache test network using web3. package.json { "name": "smartinvoice", "version": "1.0.0", "description": "", "main": "index.js", ...
1
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0answers
254 views

web3js 1.0 fromWei throwing although passing correct type

I have encountered a problem with the web3js 1.0 library. I have a simple function that is getting a balance from a smart contract: async balance() { return await this.Marketplace.balances(this....
1
vote
1answer
36 views

How can I create a copy of an existent contract in Javascript ?

I'm trying to create a copy of an contract existent contract using web3.js 1.0. I'm trying to use the functions clone and deploy but without success. contract2 = contract1.clone(); ...
1
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1answer
32 views

Issues connecting Web3js to local testnet

I am trying to connect web3 to a testnet running locally. I am using the following code var web3 = new Web3(Web3.givenProvider || "ws://localhost:8546"); var account = '...
1
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0answers
32 views

Unable to install web3-eth-ens while installing web3-version 35

I had web3 ver 36. Due to an issue, I rolled back to ver 35 as follows - npm install -g web3@1.0.0-beta.35 --save Before this, I did npm cache clear --force. However, it looks like web3-eth-ens is ...
0
votes
1answer
53 views

How to return the result of a Solidity view method from a javascript function?

I want to determine a view function of a smart contract result in web3js 1.x Suppose we have a view function getName(uint code) and want to get the name of a person having his code. So we write: ...
0
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1answer
148 views

How does .on work in Web3 1.0, and why do I get duplicate results?

I don't understand what .on event handler does in Web3. Take this example for signing a transaction: web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex')) .on('...
0
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1answer
192 views

web3js (v1.0.0-beta36) unable to use - Cannot find module 'buffer'

I included dist/web3.js (1.0.0-beta36) in my html file as below <script type="text/javascript" src="./web3.js"></script> <script type="text/javascript"> var Web3 = require('web3'...
0
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2answers
32 views

Offline creation of signed contract transactions with web3js v1.2.11

I'm attempting to sign a contract transaction offline using web3js v1.2.11. signingAddr = //my eth address signingPk = //my private key // docs: The options object for the contract instance. from, ...
0
votes
1answer
57 views

Transaction being reverted by EVM during contract creation (Web3 / ethereumjs-tx)

Hey guys I am running into an issue deploying a smart contract with Web3 to the Ropsten network. The code is running seemingly correctly, and there is a contract address being created, but if I check ...
0
votes
1answer
45 views

Web3 balance is showing OmiseGo balance but not Bitball

You can see on Etherscan that I have 2 types of tokens in my wallet: https://etherscan.io/address/0xb8fd65fc6919c5b97453eaba6b895144597985b2#tokentxns 2.3 OmiseGo and 10,000 Bitball I have a short ...
0
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1answer
432 views

problem connecting web3 v 1.2.1 with metamask : 'currentProvider' of undefined

I am using Web3 v1.2.1 with nodejs v10 and following this link. I am having issue connecting with metamask,below is my code snippet: const Web3 = require('web3') const window = require('window'); ...
0
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2answers
246 views

web3 1.0 events never fire

First off, my setup. System: ArchLinux Ganache: v2.0.0 (correction, v1.3.1) Solidity: 0.5.8 web3: 1.0.0-beta.37 (anything higher than 37, contract wont deploy) Node: 'latest' Some background and ...
0
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2answers
498 views

Getting error while deploying with web3 version 1 using async wait

I am trying to deploy my code to Infura network i compiled and i got no errors but now when i am trying to deploy i am getting error const HDWalletProvider = require('truffle-hdwallet-provider'); ...
0
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1answer
52 views

Web3 1.2.6 appears to ignore require in view function

Given the following function: function checkLock() external view returns (bool) { require( address(this) == IERC721(_nftRegistryAddress).ownerOf(_tokenId), "[...
0
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2answers
158 views

How to use sendSignedTransaction without waiting for confirmation?

I am sending ether to multiple accounts and I want to send them without delay or waiting for confirmation of previous transaction. const fs = require("fs"); const os = require("os"); const Web3 = ...
0
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2answers
59 views

Sending ether from list of addresses with web3.js

I would like to read the csv text file and make a transaction via web3.js like what I did with web3.py Here is my python code #!/usr/bin/python3.7 import os import time import pandas as pd from ...
0
votes
1answer
253 views

Why Web3 event callback fires multiple times same as the number of the solidity smart contract emitted that event in past?

I am just learning, solidity with react and web3 and I am facing the issue on page load the callback event of web3 called multiple time the number is same as I called a solidity function and that emit ...
0
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1answer
235 views

How Do You Parse Web3 Retuned JSON Objects of Events?

I am using Web3 1.0 to listen to events from a contract like this: tokenContract.events.AddressList({ fromBlock: 6020474, toBlock: 'latest' }, (error, events) => { ...
0
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2answers
6k views

SyntaxError: await is only valid in async functions and async generators in web3js [closed]

Below is my code snippet. I wish to wait for the transaction hash value so that I can return my Javascript function with the hash value. But I get the error "SyntaxError: await is only valid in ...