Import onchain NFT metadata

Developer Discussion
1

Hello Devs,
I have a NFT use case where I am developing an NFT smart contract on which the metadata is stored onchain.

While minting the NFT, I have converted the required JSON into base64 encoding and stored the URI against the tokenURI mapping over the smart contract.

While I was checking this minted NFT on MetaMask, I was able to import the NFT in my wallet but the image was rendered on the interface but when I checked on opensea marketplace the image was visible with all the other attributes as well.

I have done this development for testing on Mumbai polygon test network. I have also checked previous topics and it mentions that the metadata for MetaMask NFTs are pulled from Opensea API and opensea supports Mumbai test network.

2

Hi are you using any rpc provider?

3

No, just using the default RPC providers

4

Thanks, the best way MetaMask offers of viewing your NFTs is currently in MetaMask Portfolio, available at portfolio.metamask.io could you try portfolio pls. There are a few open issues about it on github, I think nft for various networks could be improved: Issues · MetaMask/metamask-extension · GitHub

5

But how would I check for an NFT image at a test network as portfolio supports only mainnet.
I have tried on the mainnet as well but under the NFT banner the image was not loading for Ethereum Mainnet as well on MetaMask extension.

6

Could you please confirm what erc standard are you using 721 or 1155? Thanks

7

On the test network it is ERC721 and when I checked for mainnet it was ERC1155

8

Thank you for confirmation I found an open issue on github did you see it or maybe you opened it: [Bug]: NFT not displaying the image in metamask · Issue #22671 · MetaMask/metamask-extension · GitHub

9

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