Questions tagged [javascript]
JavaScript is a dynamic, weakly-typed language used for client-side as well as server-side scripting.
1,137
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6
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Unpacking arguments when calling a smart contract function with web3.py
I'm trying to reproduce some code on python that is currently working on javascript. The main goal is to select a function to query from the contract abi and call it (just view functions).
Let's say ...
- 111
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4
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IPFS upload is creating uselless subfile
I am using Web3 Storage in order to upload my data to IPFS. The link always ends up being ipfs://CID/1.png instead of ipfs://CID.
This is my code:
import { Web3Storage, getFilesFromPath, CIDString } ...
- 81
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1
answer
9
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Wait for incoming ethereum transactions and credit them after n confirmations
I'm trying to create a website where users can deposit ethereum. For my server I'm using node.js and express.js. I looked into web3.js but the docs are unclear to me and I don't know which functions ...
- 11
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5
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Is there any way to get autocomplete for Solidity function definitions in JavaScript?
By autocomplete I mean something akin to how functions that would be declared in JavaScript get prompts/autocomplete in IDEs.
(Also, I'm using VS Code)
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20
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Error: Transaction reverted: function call to a non-contract account (while running tests)
I've been getting this error while testing my staking contract, the earlier tests where i am calling getter functions work correctly but I am getting an error probably while calling the stake() ...
- 11
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7
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How to decrease computation time of generating addresses
I tried to create a mass wallet generator for a vanity address but it only checks 33 wallets a second. Is there any optimizations or bad practices you see?
const cluster = require("node:cluster&...
- 25
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votes
1
answer
22
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Data from smart contract not properly showing JavaScript code
async function viewmyactivedeposits() {
const result = await myLoanContract.methods
.viewMyActiveDeposits()
.call()
.then(function (result) {
let data = Array.from(result);
$(...
- 1
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21
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A library for converting general cryptocurrency's private key to address
Is there a library on npm to convert a given private key and cryptocurrency's name to an address? E.g. Tron and Ethereum give different addresses when using the same private key:
let addrEthereum = '...
- 111
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1
answer
17
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Sha256 Hash from Solidity Smart Contract doesn't match web3.js Hash
I'm struggling to match two hashes. I hash a Json in String format in my Smart Contract like this.
function verifyProof(string calldata _fullProof) public returns(bool r){
bytes32 hashed = ...
- 1
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12
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Metamask login not working in alchemy "building a full stack nft dapp" lesson
I'm trying to go through https://www.web3.university/tracks/build-your-first-nft/building-a-full-stack-nft-dapp but for some weird reason it doesn't connect to metamask. Another simple script just to ...
- 1
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8
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Truffle test: Error: expected event argument '_ids' to have value 1 but got 1
I wrote an ERC1155 Nft whith this following function:
contract Nft is ERC1155{
using Counters for Counters.Counter;
Counters.Counter private id;
event MintBatch(address indexed _to, ...
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18
views
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'eth')
I am following what seems a relatively simple tutorial to create a smartcontract, however, I am getting the above error and I am stumped as to what is causing it
Below is my html file
<!DOCTYPE ...
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1
answer
16
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Alchemy - calling eth_getTransactionReceipt - HardhatError: HH110: Invalid JSON-RPC response received
Please see my deploy.js.The code fails at line 23 with await fund.deployed();
const hre = require("hardhat")
const { fundConfig } = require("../helper.config");
async function ...
- 105
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1
answer
45
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Getting the address of a contract before its deployed with brownie
While working with the lens protocol contracts I saw that they were able to precompute the address of a contract using hardhat with the following code
import { hexlify, keccak256, RLP } from 'ethers/...
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11
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Get correct price value
I am attempting to get the current prices for some tokens from Uniswap and SushiSwap.
I am using this function:
async getBuyPrice() {
const pathToBuy = await this.routerContract.methods....
- 111
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8
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Error receiving data from uniswap.Division by zero Java Script
Here is my simple code that is looking for a tri-ang arbitrage opportunity:
// Loop through each trade and get Price information
for (let i = 0; i < fileJsonArrayLimit.length; i++) {
console....
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1
answer
21
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Etherscan sends back garbage values through API for the same query that works on the website
I'm trying to fetch data through the etherscan API from a proxy aave lending pool smart contract. This works absolutely fine for AaveV1 but for AaveV2, it just sends back garbage values (uint min and ...
- 105
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28
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How to increase an account nonce on web3js?
i'm running a script using web3js in which one i have my accounts[0] that is running 2 transactions.
When i do:
await web3.eth.getTransactionCount(accounts[0]) , i receive X (number) as a response.
...
- 1
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1
answer
14
views
How to use variables set inside a beforeEach with hardhat testing
describe("func", function () {
let owner
beforeEach(async function () {
const [owner] = await ethers.getSigners()
})
it.only("should correctly set the address", ...
- 33
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23
views
Get pending transaction in Golang?
I know how to get pending transaction, from Mempool that is, in JS/NodeJs. I want to do the same thing in Golang, though. How to do it? I haven't found any example.
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1
answer
24
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hardhat testing JavaScript got data from array via [ index ] instead of ( index )
in javascript and in solidity if you need to get gata from array index you can write like that
let data = array[ index ]
but in the testing phase, i saw javascript got data from array like this array (...
- 107
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1
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12
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How to wait block confirmations after transfer
fundMe = await ethers.getContract("FundMe", deployer);
it("Check fund and withdraw", async function () {
await fundMe.fund({ value: sendValue });
await ...
- 21
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12
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Why isn't copyto clipboard function working in metamask mobile browser?
navigator.clipboard.writeText(walletAddress);
I used this piece of code to copy to clipboard. It is working properly in desktop browser but not in metamask mobile browser?
Is there any alternative ...
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1
answer
37
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The constructor of function 01-deploy-fund-me.js expect 1 argument but got 42
I am at moment 10:59:00 in the tutorial https://www.youtube.com/watch?v=gyMwXuJrbJQ&list=PLMippBqdcHKavY7WqPnoWbRgkgjn0dq9v&index=27&t=297s&ab_channel=freeCodeCamp.org, I try tu run:
...
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1
answer
11
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Passing an error testing suite in contract
hello how do i make a proper testing suite for error?
the contract has this modifier for freeMint() fn
modifier protectTier(uint256 _level) {
require(
_level != privateTier, &...
- 111
1
vote
1
answer
37
views
Difference between const ethers and const { ethers }
can anybody explain what is the difference between
const ethers = require("hardhat");
and
const { ethers } = require("hardhat");
- 21
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votes
2
answers
18
views
How to get the actual workflow (event)
I've got several enums in solidity :
enum WorkflowStatus {
RegisteringVoters,
ProposalsRegistrationStarted,
ProposalsRegistrationEnded,
VotingSessionStarted,
...
- 11
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votes
1
answer
15
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Chain tests in mocha framework with smart contract testing
I am doing smart contract testing with hardat and mocha framework. Suppose I have two following it blocks testing contract A.
it('test1', () => {
contractA.updateValue(val);
// some other ...
- 163
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3
answers
73
views
how to test if array contains any value? [duplicate]
this is my smart contract
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;
contract SimpleStorage {
uint256 public favoriteNumber;
struct People {
uint256 favoriteNumber;
...
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0
answers
25
views
convert a hex string to bytes32[] using web3js
I have a string thats 64 characters long and I need to convert it into a bytes32[] to be passed into a contract method call. How can I do it using web3js? I tried using hexToBytes in the utils package ...
- 1
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28
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Authorization using Metamask - Signing and validating - can you find any weaknesses in this approach?
I would like to develop a webapp (frontend: ReactJs, backend: Spring Boot) in which users can interact without logging in in the traditional sense of the word (username + password) but instead using ...
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7
views
Best way to update addresses in web3js subscription
I am using web3js to subscribe to logs for specific contracts. This list of contracts is pulled from a database. However, every once in a while this list will be updated. I am not sure of the best way ...
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9
views
Simulate txn using script
Is there any way to simulate the transaction programmatically?
I know we can do it via Gnosis Safe UI but interested in doing it programatically.
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13
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Writing special character inside the addParam when writing task function. ex: addParam("my:example")
Is there any way to write ":" or "_" or "-" in function "addParam()" inside "task".
For example .addParam("my:example") or .addParam("...
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0
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72
views
Invalid BigNumber value error. Arguments="value", value=undefined
so I'm getting this error on my deploy script. I have seen the other questions and have tried their solutions but they are not working for me.
So this is my deploy script
const { netowrk, network, ...
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1
answer
29
views
How to get transaction link into etherumscan to my website using etherumscan API
please help me with my problem :
I am creating a website with blockchain. Now I need to get my transaction results into etherscan.io to my website with a link for this transaction and all these by ...
0
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1
answer
16
views
How to read a mapping through devtools
I'm working on Ethernaut challenge lvl 1
follow the link or scroll below for the smartcontract code.
I check my addresse in the "contributions" mapping, I add some eth, and I recheck.
what ...
- 1
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answers
23
views
how to figure out IERC20 token address from javascript
I would like to send some IERC20 tokens from metamask
for contract I link an HTML button to following javascript function
const placeFunds = async (side, e) => {
e.preventDefault();
await ...
- 101
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votes
1
answer
21
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Testing a SmatContract on Ropsten - The transaction is "Success" but I didn't get token in my wallet
I'm trying to take my first steps in the blockchain, and sometimes I stuck with some very weird issue (for me), this is one of them.
I've deployed a very simple SmallContract that inherit from @...
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9
views
Solidity event doesn't include args
I'm emitting an event from a Market.sol contract with three indexed args but they aren't showing up in my frontend after calling the contract function.
Contract code:
event MarketTokenEvent (
...
- 121
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fetch the event data in the console
please what should I put inside the console.log() to fetch the 2 returned addresses of the event(args[0], args[1])? and thank you!
const filter = {
address: '0xbc4...',
topics: [
...
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1
answer
60
views
Call to contract doesn't work when sending a merkle proof (using ethers & JS)
I basically have a contract whose mint function looks like this:
function mint(uint256 _mintAmount, bytes32[] calldata merkleProof) public payable isValidMerkleProof(merkleProof, ...
- 1
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11
views
My test doesn't pass but expectation return correct value (truffle)
I have a voting Contract which contains 3 functions , 1 Struct, 1 mapping, 1 modifier and I use Ownable from openzeppelin :
struct Voter {
bool isRegistered;
bool hasVoted;
...
- 11
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votes
1
answer
128
views
UNIT Test Error: No Contract deployed with name Raffle
This is the section of my unit testing... I've been working on this problem for the last few hours. I couldn't, however... I think the error is in const { deployer } = await getNamedAccounts() this ...
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1
answer
263
views
Error: chainId address mismatch
i'm trying to deploy a simple smart contract with node-js on a ganache-GUI but i keep getting this Error: chainId address mismatch;
may chainId is the same as the networkId in the ganache app witch is ...
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1
answer
50
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Does Smart Contract pay gas fees in this case?
Lets say there are 2 smart contracts A and B. A contracts approves B contract for some allowance, as B has approval to withdraw from A contract. Lets say contract B withdraw some X coins from A ...
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1
answer
49
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How can I batch execute multiple Gnosis Safe transactions via js/ts?
I've been using the typescript npm libs gnosis.pm/safe-core-sdk and @gnosis.pm/safe-service-client to execute Gnosis Safe transactions one-by-one. Recently I've noticed in the web UI that one can ...
- 101
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1
answer
57
views
Flashloan Arbitrage error 'SafeERC20: low-level call failed'
So I finally am almost finished with my flashloan arbitrage how ever when I run it I get this error
'SafeERC20: low-level call failed'
here is my contract code
// SPDX-License-Identifier: MIT
pragma ...
- 107
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1
answer
184
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web3modal error during Wallet Connect function for web3 in javascript
i try to follow github web3modal guide to con figure my wallet connect in javascript . pls help me on this issue. appreciate
https://github.com/Web3Modal/web3modal-vanilla-js-example
html
<...
- 17
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0
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18
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Transfer multiple tokens with one confirmation in Smart chain
I want to send several tokens at the same time with a transaction in Smart Chain with the web3 DApps Trust Wallet
- 1