Fix Ethers Contract Event Log Errors

You will learn how to decode and handle event logs from contract interactions.

The Problem

The ethers contract event log pattern is frequently misapplied in smart contract and dapp development, leading to vulnerabilities, gas inefficiencies, or logic errors. This guide shows the correct implementation and common pitfalls to avoid.

Quick Fix

Wrong

const receipt = await tx.wait();
console.log(receipt.logs); // Raw logs

Raw log data. No parsed event information.

Right

const receipt = await tx.wait();
for (const log of receipt.logs) {
  try {
    const parsed = contract.interface.parseLog(log);
    console.log(parsed.name, parsed.args);
  } catch (e) {}
}

Parsed event logs with name and typed arguments. Filterable by event type.

Prevention

• Always parse logs after transactions
• Use try/catch for unknown events
• Use event names for log filtering
• Use DodaTech's event parser
• Log parsed events for debugging

DodaTech Tools

Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro. Doda Browser's developer tools include a Solidity debugger and transaction inspector. DodaZIP archives secure contract templates for team collaboration. Durga Antivirus Pro scans deployed contracts for known vulnerability signatures.

FAQ