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How can I implement code that returns whether a token is in the ERC721 or ERC1155 standard, knowing both the contract address and the tokenId? What I tried is that I call a function that exists only on ERC1155 standard and if it fails then it's obviously an ERC721 token. But this is probably not the best solution. Any tips?

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Please study ERC-165 and see the interface detection discussed in both ERC-721 and ERC-1155.

0xcert and OpenZeppelin both include implementations so I would not want to paste everything in here.

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  • Looked it up, probably that's what I need ,although I don't really understand how to use it. As I understand, I need the ERC165Checker library's _supportsInterface function which tells me if a specific contract at address has a specific interface. But how can I use this function outside of solidity in js with web3?
    – warren1235
    May 9, 2021 at 6:59
  • Please see here eips.ethereum.org/EIPS/…. And then as how to implement that using web3js, please see web3js.readthedocs.io/en/v1.3.4/… May 10, 2021 at 19:18
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I have an implementation which doesn't rely on erc-165, but we get the code and check if certain function signature exists, check the implementation here: https://github.com/botfi-app/token-standard-detector

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