Questions tagged [javascript]
JavaScript is a dynamic, weakly-typed language used for client-side as well as server-side scripting.
1,366
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How to get transaction fees and minus it from balance
I created an auction exchange smart contract using solidity programming language and I am using ganache for testing this is a test file written in JavaScript. seller is the creator of auction and ...
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19
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How to find a variable declaration in an AST object
I'm using Javascript, and I have a Solidity AST object.
Is there a library or an example out there to easily find if a text string (variable/function/mapping/struct etc declaration) exists and return ...
- 113
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55
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Unable to access the function in the contract using hardhat ethers
This is the smart contract code :-
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
interface IUniswapRouter {
function swapExactTokensForTokens(
uint amountIn,
uint ...
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26
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Viem wallet client method does not exist / is not available
I am trying to interact with a smart contract from a front-end web app using viem.
I am successfully creating a Wallet Client with my wallet address, but when I call some of its methods, I get the ...
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2
answers
12
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How relevant is front end knowledge to landing a job coding in solidity, or just coding in Solidity in general?
I am very interested in learning how to code in Solidity and work with smart contracts, but I have much less interest in working with front end.
Since I don't want to slog through hours and hours of ...
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11
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Getting Quote Exact single input to work on quickswap
So im trying to check how many tokens i'll get before i do a swap on quickswap like (1USDC -> 0.1655....LINK), I've tried to use:
try{
const amountOut = await quickquoter.callStatic....
- 11
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vote
1
answer
17
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Call sendSignedTransaction without waiting for result (execute in background)
My Vue.js code with web3.js:
function dreamOn() {
await web3.eth.sendSignedTransaction(txFin);
return;
}
I want to send this transaction, but I don't want to wait for the result of ...
- 11
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1
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19
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How can I retrieve the latest locked token from the Ethereum blockchain using JavaScript without knowing Solidity?
I'm a JavaScript developer with limited knowledge of Solidity, and I need to retrieve information about the latest locked token from the Ethereum blockchain. I want to accomplish this task using ...
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1
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24
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Trying to access the retrieve method from deployed smart contract but not able to using ether.js
Above is the the error I'm getting when trying to access the retrieve method from the smart contract I've written although I'm able to get the contract object which means I've connected to the ...
2
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1
answer
27
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What's Wrong With My Polygon Mainnet Aave Flashloan Script? - Fail with error '27' & Fail with error 'ERC20: transfer amount exceeds balance'
I have successfully deployed and executed a flashloan on the Polygon network in testnet and have since adapted it for mainnet.
On Mainnet it compiles and gets deployed with no problem, but when I ...
- 23
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19
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How to run a script which requires a private key completely in a browser?
For a non-technical person I need to create a page on my website, in the admin area, in which he'd regularly do stuff that normally is done on local machine only. That is, a person doesn't want to go ...
- 49
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1
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60
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Unable to connect to Testnet Sepolia
Command:
npx hardhat --network sepolia run scripts/deploy.js
Getting error messages:
* Invalid account: #0 for network: sepolia - private key too long, expected 32 bytes
* Invalid value undefined ...
- 15
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0
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6
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Data is not updating in the chaincode
This is my HTML form
<div class="text-center form-container">
<form id="updateForm" action="" name="updateOwner" style="display: none;&...
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1
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40
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How to get the amount recieved during swap on Uniswap?
I'm trying to get the amount that I recieved in WETH during swap on Uniswap(can be hardcoded WETH).
On the code below, I took random address that did swap, got his transactions and then decoded it ...
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8
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Language bar not showing on github repository
Github repository is not showing the language of project. Repo Link :- https://github.com/shubhamextraxyz/Contract_Deployment_Infura_Web3.js
The file is a simple repo with 100% Javascript, but why it'...
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82
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How Can I Filter Ethereum Transactions by Method ID or Name, Similar to Etherscan's Advanced Filter Feature
I am working on a project where I need to retrieve all transactions associated with a specific method within a given block or set of blocks. As an example, Etherscan provides this functionality ...
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15
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Can not delete the address from the struct and array in JavaScript
My other functions are working so I guess other codes are fine. I am just getting this error after clicking the delete key:
"Error deleting patient: Error: invalid address
at v (web3.min.js:2:...
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1
answer
23
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"Error: Invalid Argument in getAmountsOut Function Call."
// Get Provider
const providers = new ethers.providers.JsonRpcProvider("https://");
// Get Velodrome V1 Router
const routerABI = [
"function getAmountsOut(uint amountIn, ...
- 11
1
vote
1
answer
23
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Smart Contract Working in Remix Testnet but Reverting Transactions in DApp with Metamask
Question:
I'm encountering a perplexing issue with my smart contract that's causing transactions to be reverted when interacting with it through a DApp using web3.js and Metamask. Strangely, the same ...
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Why i get evm revert error when calling the method from dapp front end (web3js & metamask)??? but my contract works fine on remix and bscscan
I've created a smartcontract & deployed on bsc testnet. For the past 8 weeks, i have been upgrading and testing the contract on remix and website and they always works fine. I can mint on remix ...
- 31
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1
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21
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Please somebody help me with this error in getting transactionReceipt : "TypeError: contract.deploymentTransaction.wait is not a function"
const ethers = require("ethers");
const fs = require("fs-extra");
async function main() {
// http://127.0.0.1:7545
let provider = new ethers.JsonRpcProvider("http://127.0....
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20
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How is exchange rate calculated on DEX platforms like uniswap and sushiswap?
I started getting into the crypto scene and I read about liquidity pools but I am not sure how to get exchange rates into my javascript code, I looked for API's and SDK's but couldn't find any for the ...
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1
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55
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How to get correct liquidity amount on UniswapV3 for each token(pair) via web3.js?
I'm trying to create a bot that will send me new LPS notifications on Uniswap V3 and in the future more dexes. I want to contain in the message specific data like amount of token and ETH in the pool, ...
- 131
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1
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21
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Use of { } when importing libraries?
Can anybody tell me the exact use of { } in import/require library statements?
I've seen some other questions where people said it's to import just a part of a library, let's say the 'ethers' part of ...
- 185
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1
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10
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Help with “web3 not defined”
I am cloning a tutorial https://github.com/techaddict0x/liquidityminer
And when I run the debug console I get the error “web3 is not defined”
The code is the exact same, looked all over the internet ...
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0
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21
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How would I access a contract's public property (variable) using web3.js?
I'm trying to get a variable called "entryAmount". I've tried many methods, like calling it as a method, but it doesn't work.
A part of the solidity code:
pragma solidity ^0.8.0;
contract ...
- 11
1
vote
1
answer
40
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How to get Factory address from the Router address? Web3.js
I'm trying to get a factory address for Uniswap on base network, unfortunately I'm not able to locate this address anywhere and I'm kind of desperate as without it I'm not able to try my code that ...
- 131
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19
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What api can i use to find token max per wallet and max per tx
Im trying to make a programm that returns max tokens per wallet and max tokens per transaction after i provide the contract address. What api should i use for this goal?
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54
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Reading from a nodejs object
I try to read data from this node js object (I got it from sequencer feed on arbitrum):
data = [
BigNumber { _hex: '0x0f634d1e114f4d', _isBigNumber: true },
BigNumber { _hex: '0x01', _isBigNumber: ...
- 63
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1
answer
21
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Sell static error
I keep getting this error when i try to perform a static test call
async sellTestTransaction(tokenAmount, gwei) {
const token = await Fetcher.fetchTokenData(chainId, this.address, provider);
...
- 1
2
votes
1
answer
189
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Reading transactions from arbitrum sequencer feed
I try to read transactions from arbitrum sequencer feed and decode the transaction data to get information about the transaction, therefore I try to check which function is called for the transaction ...
- 63
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80
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How to fix Error: fractional component exceeds decimals?
I cannot seem to be able to fix the error "Error: fractional component exceeds decimals [ See: https://links.ethers.org/v5-errors-NUMERIC_FAULT ] (fault="underflow", operation="...
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143
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Encountering an error with getContractAt using hardhat-ethers and ethers v.6.6.7
I am doing a tutorial on youtube, and I can't figure out why I am getting an error code by running yarn hardhat run scripts/aaveBorrow.js:
Error: contract runner does not support calling (operation=&...
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0
answers
25
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We have an own wallet but we don't have an idea how to connect this to other sites?
I had an Wallet created by Own.I need to connect that wallet with active sites like Metamask.If we want to connect the Metamask with Site means we call window.ethereum default as a trigger comment.
...
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0
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72
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How to track ERC20 token creations on Ethereum blockhain with web3.js using Infura API?
I'm trying to fetch new ERC20 tokens from the blockchain transactions, my code is scanning the blocks and when I tried to log transactions it works well, (dumping bunch of logs). However I don't know ...
- 131
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51
views
Contract.on event listener not working (using Ethers.js + Next.js), how come?
got a simple question here for all you ethers.js hackers. Simple code, transactions go through, but why doesn't the contract.on function work?
const handleSubmit = async (e) => {
e....
- 13
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0
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12
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"not logged in" when metamask gets locked by password
I have a pretty standard code used by logging in via MetaMask, something similar to this:
const connectWallet = async () => {
const provider = new ethers.providers.Web3Provider(window.ethereum)
...
- 85
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0
answers
103
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Get ERC20 token buy/sell tax
I am trying to implement a method for calculating token buy/sell tax. The one that devs implement it in the transfer() function.
I've done some research and there are 2 options.
eth_call - simulate a ...
0
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0
answers
77
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Got different prices from SqrtPriceX96 and from Tick on Uniswap
I trying to get price (ratio) from pool on Uniswap v3 by JS with ethers.js.
But I got a slightly different prices from SqrtPriceX96 and from Tick, for some reason.
SqrtPriceX96 and Tick took from '...
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1
answer
25
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Transaction Decoding on Fantom. I can't extract the data I need
This is the first question I post here so I hope my question asked properly.
I'm scanning the Fantom mempool searching for specific types of functions that interfere with pairs liquidity. I'm having ...
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1
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94
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unpredictable gas limit error doesn't go away after setting gasLimit manually
I have this contract which is written in solidity and one of the functions (getMyActivity()) returns an array of structs and im trying to call it from my frontend which is written in ReactJS but i get ...
- 83
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2
answers
24
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How to convert solidity return uint and use it on frontend using Etherjs
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
contract Lending {
// calculating the value of loan on the basis of collateral
uint LTV = 20;
mapping(address => uint) ...
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0
answers
207
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Getting "err: max fee per gas less than block base fee" when estimating gas cost of a transaction
For the last few days, I have some trouble using the eth_estimateGas function from the Quick Node provider.
Indeed, after fetching a transaction from the mempool, I want to estimate the gas cost of ...
- 101
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5
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Why is computedFee too small when using function?
I tried to calculate computedFee according to this page: https://www.metacrypt.org/tools/uniswap-v3-calculator-simulator/?network=ethereum&token0=0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2&...
- 1
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vote
2
answers
87
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How to call a smart contract function by passing a struct in it
I would like to call exactInputSingle function of pancakeswap contract:
"function exactInputSingle(struct IV3SwapRouter.ExactInputSingleParams params) external payable returns (uint256 amountOut)&...
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2
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149
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TypeError: no matching function (argument="key", value="provider", code=INVALID_ARGUMENT, version=6.6.2)
It seems like the syntax has changed a bit, the course I am following might have outdated syntax but I am unable to find the correct syntax to get the balance. Could someone help me, the code is this -...
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199
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"TypeError: (0 , ethers_1.getAddress) is not a function" when writing tests in hardhat with typescript
i get this error when i run this test:
typescript
import { expect } from "chai";
import { ethers } from "hardhat";
import { Ballot } from "../typechain-types";
const ...
0
votes
1
answer
60
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How to send signed data to backed and verify it?
On a web page I have some 3 fields, name, age and height, which a user authenticated via MetaMask sends to backend along with his wallet address. In JSON.
In order to ensure that data that's sent ...
- 85
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0
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16
views
Running test with --grep returns 0 passing
I am using hardhat and trying to run tests with the command-
yarn hardhat test --grep "amount funded"
FundMe.test.js code-
const { deployments, ethers, getNamedAccounts } = require("...
1
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0
answers
106
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Cannot solve Error: Invalid Chai property: revertedWith
I am trying to run a test on my contract using hardhat and chai. But I am running into this error.
I have tried install ethereum-waffle. But it did not solve the problem. I also added ethereum-waffle ...