I have a function that takes a bytes in solidity, and I want to pass it an empty bytes string without doing "0x000...", can I do this in ethersjs?

2 Answers 2


ethers.js has a Constants object that contains common values. One of those is ethers.constants.HashZero, which represents an empty bytes32 string.

There are more constants that you could read about here: https://docs.ethers.io/v5/api/utils/constants

For bytes, you would place an empty array ([]) as input in ethers.js. This is due to bytes being an array-based value.

  • Thanks, but what if I wanted to format a bytes object? Commented Feb 23, 2022 at 15:36
  • 1
    @PatrickCollins I've updated my answer above to include bytes. Commented Feb 23, 2022 at 15:46
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    Just to mention, the hex value '0x' should also work for empty bytes. Commented Feb 23, 2022 at 16:54
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    @SohamZemse That's correct. A 0x hex value would also work. Commented Feb 23, 2022 at 17:17
let value = ethers.utils.formatBytes32String("")

This will give you 0x00....00

  • 1
    In Ethers.js V6, formatBytes32String was replaced by encodeBytes32String.
    – Peter
    Commented Feb 11, 2023 at 4:24

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