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ethers-error-parser

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Parse Ethers.js errors with ease 💅🏻

Highlights

  • Zero dependencies 🧹
  • Lightweight 📦
  • Simple to use ⚡️
  • Work in progress 🚧

Why

Ethers.js is well known for its cryptic error messages. Whenever a transaction fails you will get an error message that combines plain text and JSON stringified string like this:

Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"code":-32603,"message":"execution reverted: Code has already claimed","data":{"originalError":{"code":3,"data":"0x08c379a000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000018436f64652068617320616c726561647920636c61696d65640000000000000000","message":"execution reverted: Code has already claimed"}}}, method="estimateGas", transaction={"from":"0xC16f5C62b29704F7aBECb27A3cb7E12a91383261","to":"0xb21FFFd62BD2f4aBd2a1dC34A2302Fda364977a0","data":"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","accessList":null}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.5.1)

Your users deserve to get amazing feedback on failing transactions. Thanks to ethers-error-parser you can do that with ease.

Work in progress

This package is a work in progress. Although it is not yet complete and many Ethers errors could be handled more elegantly, it is safe to use in production as it is. Some insights is better than no insights.

This package is being used in different production projects and it is in constant evolution based on the needs of these projects. If you find some error that is not handled yet or that does not provide a great context, please open an issue or pull request 🙏

Getting started

  1. Install the package
yarn add @enzoferey/ethers-error-parser
  1. Use it
import { getParsedEthersError } from "@enzoferey/ethers-error-parser";

try {
  const transaction = await someContract.someMethod();
  await transaction.wait();
} catch (error) {
  const parsedEthersError = getParsedEthersError(error);
  // parsedError.errorCode - contains a well defined error code (see full list below)
  // parsedError.context - contains a context based string providing additional information
  // profit ! 💅🏻
}

Return value

When using getParsedEthersError you will get back an object containing a well known errorCode property and an optional context property with additional information. The TypeScript type definition looks like the following:

interface ReturnValue {
  errorCode: string;
  context?: string;
}

Here is the complete list of returned objects:

errorCode context
TRANSACTION_RAN_OUT_OF_GAS The transaction gas limit as a string.
TRANSACTION_UNDERPRICED undefined
REJECTED_TRANSACTION The reason why the transaction rejected.
CALL_REVERTED The reason why the call reverted.
EXECUTION_REVERTED The reason why the transaction reverted.
NONCE_TOO_LOW The transaction nonce as a string.
INSUFFICIENT_FUNDS_FOR_GAS undefined
MAX_PRIORITY_FEE_PER_GAS_HIGHER_THAN_MAX_FEE_PER_GAS undefined
MAX_FEE_PER_GAS_LESS_THAN_BLOCK_BASE_FEE undefined
UNKNOWN_ERROR Some code or description of the error if available. undefined otherwise.

The error codes strings can be accesses via the RETURN_VALUE_ERROR_CODES constant that the package exports.

If you find some error that is not handled yet or that does not provide a great context, please open an issue or pull request 🙏

TypeScript usage

If you are using TypeScript, you may find the required types exported at the root of the package. For example, when handling a common try / catch statement, you will need to cast the error to use the internal EthersError type:

import {
  getParsedEthersError,
  EthersError,
} from "@enzoferey/ethers-error-parser";

try {
  const transaction = await someContract.someMethod();
  await transaction.wait();
} catch (error) {
  const parsedEthersError = getParsedEthersError(error as EthersError);
}