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Metamask: Error including additional data in web3.eth.sendTransaction()

Published by Terlumun Aondover on February 4th, 2025.

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Metamask: Error including additional data in web3.eth.sendTransaction()

When sending transactions using a MetaMask wallet, it is often necessary to include additional data in the transaction request. However, this can be tricky to process correctly, as the web3.eth.sendTransaction() method allows an optional data parameter, which must follow a specific format.

Understanding the data format

Metamask: Error when including extra data in web3.eth.sendTransaction()

According to the Ethereum documentation, the expected format of a transaction object is:


{
"from": ,
"to": ,
"value": ,
"gasPrice": ,
"gas": ,
"nonce": ,
"date": 
}

This data includes the sender and receiver addresses, the transaction amount, gas prices, gas limits, nonce, and an optional data parameter. However, including additional data in a transaction request can cause errors or unexpected behavior.

Common errors

Including additional data can cause problems with the Ethereum network processing transactions correctly. Some common examples of errors that can occur are:

Invalid transaction signature: If MetaMask includes additional data in the transaction signature, it can be difficult for the network to verify and validate the transaction.

Gas Price Mismatch: Including the wrong gas price in the transaction data can cause inconsistent results or errors when processing transactions on the Ethereum blockchain.

No Collisions: Including too much extra data in the transaction signature can cause a no collision when two different accounts try to send the same transaction to the same recipient.

Best Practices for Including Extra Data

To avoid these issues and ensure that MetaMask sends transactions correctly, follow these best practices:

Keep it simple: Include only essential data in the transaction request.

Use standard JSON format: Follow the standard JSON format specified in the Ethereum documentation.

Check data before sending: Check transaction data before sending it to the network to ensure that it is valid and correct.

By following these best practices, you can reduce errors and ensure that MetaMask sends transactions correctly by including additional data in web3.eth.sendTransaction().

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