Metamask: “Error: write after end”: ReactJS with web3js and MetaMask on Chrome

06 Feb Metamask: “Error: write after end”: ReactJS with web3js and MetaMask on Chrome

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Metamask Issue in ReactJS with Web3JS and MetaMask

As a developer working with ReactJS v18.2 and web3.js v1.8 for blockchain interaction, I encountered a common issue with Metamask integration: “Error: Write after end”. In this article, we will explore the cause of this error, its impact on our application, and provide solutions to fix it.

Issue

When working with Metamask, web3.js expects a transaction to be fully executed before writing to the blockchain. However, sometimes the execution is interrupted due to various reasons, such as network issues or user input. As a result, we may encounter the error “Error: Write after end” when trying to send transactions.

Causes of the problem

There are several reasons that can cause this issue:

• User input: When a user enters their MetaMask password, it can block further requests from being executed for security reasons.

• Network issues: A short network delay or disconnection can cause a transaction to abort before it is fully executed.

• Timeout

  : If we don’t set a timeout for sending transactions, they can time out and leave us with an “Error: Write after end” error.

Impact on our application

To understand how this issue affects our application:

• When users try to send transactions to the test server, the “Error: Write after end” error will prevent them from completing the transaction.

• On the main server, which is connected to the same blockchain instance as the test server, we may encounter similar issues due to network latency or user input.

Workarounds

To resolve this issue and ensure a smooth user experience, please follow these steps:

• Implement error handling: We need to handle the “Error: Write after end” error by implementing retry mechanisms or transaction sending timeouts.

• Set timers for transaction sending: Set timers to wait before sending transactions to ensure they are not interrupted by user input or network issues.

• Use retry mechanism with Web3.js: Consider using a library such as web3js-retry' to retry failed transactions, reducing the number of "Error: Write after end" errors.

import {ethers} from 'ethers';
import * and Web3 from 'web3';
const contract = new ethers.Contract('0x...', Web3, { mainnet: true });
function sendTransaction() {
try {
const transaction = await contract.createTransaction({
to: "0x...",
value: '0.01 ether',
gas limit: "10000000",
gas price: "20000 gwei"
});
const txHash = await contract.sendTransaction(transaction);
console.log(Transaction successfully sent: ${txHash}`);
} catch ( error ) {
if (error instanceof ethers.WalletError) {
console.error('Wallet error:', error.message);
} else if (error instanceof Error) {
console.error('Error:', error.message);
}
}
}
const intervalId = setInterval(sendTransaction, 10000);
// Function to call sendTransaction every minute
function checkForSend() {
clearInterval(intervalId);
sendTransaction();
}
setInterval(checkForSend, 60000); // Send transactions every hour

By implementing error handling and using a retry mechanism with “web3js-retry”, we can ensure that our application remains stable even in the event of network issues or user input.