How to create NFT in Statemint?

Question

How to create nft in statemint in javascript.and how to set the nft images. can any one provide the example. my test code go wrong.

 const wsProvider = new polkadot.WsProvider("wss://westmint-rpc.polkadot.io");
 const api = await polkadot.ApiPromise.create({provider:wsProvider});

let tx = api.tx.utility.batchAll([
  api.tx.uniques.create(classId, ADDR_1);
  api.tx.uniques.setAttribute(classId, null,"Link","https://cloudflare-ipfs.com/ipfs/QmRdpVRCLxN51vNnYCRr2is1w6UVpT3mR8YDov9ktPmKub"), // this tx will crash
    ]);
tx.signAndSend(pair);
  

Answer 1

Here is an example of using the uniques pallet to create non-fungible assets:

export const createNonFungibleAssets = async () => {
    let tx = api.tx.utility.batchAll([
        api.tx.uniques.create(classId, admin),
        api.tx.uniques.setAttribute(classId, 1, "cid", "FgsChd2hVdrJ6bfo3WBcTW4iZnpHm8TEzWkLHmLpXhF68k"),
        api.tx.uniques.setAttribute(classId, 2, "cid", "JrqChd2hKbrJ6bfo3WBcTW4iZnpHm8TEzWkLHmLpXhF68d"),
        api.tx.uniques.setAttribute(classId, 3, "cid", "LxmChd2hSsrJ6bfo3WBcTW4iZnpHm8TEzWkLHmLpXhF68a"),
        api.tx.uniques.mint(classId, 1, owner),
        api.tx.uniques.mint(classId, 2, owner),
        api.tx.uniques.mint(classId, 3, owner)
    ])
    tx.signAndSend(pair, ({ status }) => {
        if (status.isInBlock) {
          console.log(`included in ${status.asInBlock}`);
        }
      });
}

Typically you will not store the image on-chain. You would use a third-party service to store the images and store the hash on-chain.