How to create an empty bytes or bytes32 in ethersjs?

Question

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?

Ahmed Ihsan Tawfeeq · Accepted Answer · 2022-02-23T15:51:21.637

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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.

edited Feb 23 '22 at 15:51

answered Feb 23 '22 at 15:34

Ahmed Ihsan Tawfeeq

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Thanks, but what if I wanted to format a bytes object? – Patrick Collins Feb 23 '22 at 15:36
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@PatrickCollins I've updated my answer above to include bytes. – Ahmed Ihsan Tawfeeq Feb 23 '22 at 15:46
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Just to mention, the hex value '0x' should also work for empty bytes. – Soham Zemse Feb 23 '22 at 16:54
@SohamZemse That's correct. A 0x hex value would also work. – Ahmed Ihsan Tawfeeq Feb 23 '22 at 17:17

Patrick Collins · Answer 2 · 2022-02-23T16:07:18.027

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let value = ethers.utils.formatBytes32String("")

This will give you 0x00....00

edited Feb 23 '22 at 16:07

answered Feb 23 '22 at 15:36

Patrick Collins

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In Ethers.js V6, formatBytes32String was replaced by encodeBytes32String. – Peter Feb 11 '23 at 04:24

How to create an empty bytes or bytes32 in ethersjs?

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