Ethereum: With ethers.js v5, how to get the reverted message string or reverted reason?
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Here is an article on how to retrieve the rolled back message string or reason from Solidity’s ethers.js library:
Returning the message string or reason using ethers.js v5
In Solidity, there are statements like revert("for something") or require(a < b, "a must be less than b"). To get the error reason using ethers.js, we need to use theethers.utils.revert()’ function.
The ethers.utils.revert()' function returns a promise that resolves to an error object containing information about the rolled back transaction. We can then access the error message or reason by callingerror.messageorerror.reason.
Here is an example:
const ethers = request('ethers.js');
// Create a new account
const account = ethers.utils Account.create();
// Revert with custom reason
ethers.revert({
from: account.address,
to: '0x...',
gas: 100000,
nonce: 1,
value: 10n, // in wei
reason: "Something went wrong! Please try again later.",
});
// Get the error message or reason for the revert
const error = ethers.utils.revert().then((err) => err);
console.log(error.message); // "Something went wrong! Please try again later."
In this example, we create a new account and then use ethers.revert()to revert a transaction with a custom reason. The returned promise resolves to an error object containing information about the reverted transaction.
If we access the error message or reason with the "error.message" or "error.reason" command, we can gain valuable insight into what went wrong during the rollback process.
Best Practices
- Always handle errors appropriately and display them to the user.
- Keep track of error messages and reasons for later analysis.
- Use theethers.utils.revert()` function if a transaction needs to be rolled back based on a custom reason or message.
- Keep in mind that ethers.js v5 may have changed its API, so be sure to check the documentation for any changes.
I hope this helps! If you have any questions or need further assistance, please contact me.