I'm encoding parameters on-chain to pass into new OZ Beacon proxy instances. For verification purposes, I need to encode the same arguments via ethers.js

The solidity function:

abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)

And an ethers function that I tried, but returns an undesired result (longer, does not start with function selector)

  const abiCoder = ethers.utils.defaultAbiCoder;
  const encoded = abiCoder.encode(...

1 Answer 1


This is how it is done as of ethers.js v5:

let ABI = [signature];
let iface = new ethers.utils.Interface(ABI);
iface.encodeFunctionData(functionName, [param1, param2, ...]);

Note that signature needs to be in the format of function functionName(type1 param1, type2 param2, ...).

Also answered here in a GitHub issue.

  • how about with ethers js version 6? they changed quite a bit in the new version Jul 10, 2023 at 0:38

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