How do I check if connected wallet has X NFT?

Question

I'm using the Solana dApp Scaffold to build a basic app.

How do I check if the connected wallet has X NFT?

Answer 1

Solution 1

You can use solana/web3.js. get all token accounts by owner then check if the token account with a certain mint has a balance of 1.

Solution 2

Get all NFTs then check if there's the NFT you are looking for.

import { Metaplex, keypairIdentity } from "@metaplex-foundation/js";
import { Connection, clusterApiUrl, Keypair, PublicKey } from "@solana/web3.js";

(async () => {
  const connection = new Connection(clusterApiUrl("mainnet-beta"), "confirmed");
  const keypair = Keypair.generate();

  const metaplex = new Metaplex(connection);
  metaplex.use(keypairIdentity(keypair));

  const owner = new PublicKey("2R4bHmSBHkHAskerTHE6GE1Fxbn31kaD5gHqpsPySVd7");
  const allNFTs = await metaplex.nfts().findAllByOwner(owner).run();

  console.log(allNFTs);
})();