Encode Packed

EncodePacked performs non-padded encoding (like Solidity’s abi.encodePacked): values are concatenated without 32-byte padding. It is a standalone function and does not require a parsed ABI.

Import

import (
  "math/big"
  "github.com/ethereum/go-ethereum/common"
  "github.com/ChefBingbong/viem-go/abi"
)

EncodePacked

import (
  "math/big"
  "github.com/ethereum/go-ethereum/common"
  "github.com/ChefBingbong/viem-go/abi"
)

types := []string{"address", "uint256", "string"}
values := []any{
  common.HexToAddress("0x14dC79964da2C08b23698B3D3cc7Ca32193d9955"),
  big.NewInt(420),
  "hello",
}

packed, err := abi.EncodePacked(types, values)
if err != nil {
  log.Fatal(err)
}
// packed is []byte

• Signature: EncodePacked(types []string, values []any) ([]byte, error)
• types and values must have the same length.
• Supports address, string, bytes, bool, int/uint, fixed bytes, and arrays.

Go notes

• Use standard ABI encoding (32-byte padded) for contract calls; use EncodePacked when you need packed hashes or compact encoding (e.g. EIP-712, custom hashing).

See also

• Encode Parameters — padded ABI parameter encoding
• Contract Encoding — EncodeFunctionData for calldata