Solana Cookbook

Non Fungible Tokens (NFTs)

How to create an NFT

To create an NFT you have to:

  1. Upload the image to IPFS like Arweave
  2. Upload the json metadata to IPFS like Arweave
  3. Call metaplex to create an account for the NFT

Upload to Arweave

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import fs from "fs";
import Arweave from "arweave";

(async () => {
  const arweave = Arweave.init({
    host: "arweave.net",
    port: 443,
    protocol: "https",
    timeout: 20000,
    logging: false,
  });

  // Upload image to Arweave
  const data = fs.readFileSync("./code/nfts/arweave-upload/lowres-dog.png");

  const transaction = await arweave.createTransaction({
    data: data,
  });

  transaction.addTag("Content-Type", "image/png");

  const wallet = JSON.parse(fs.readFileSync("wallet.json", "utf-8"))
  
  await arweave.transactions.sign(transaction, wallet);

  const response = await arweave.transactions.post(transaction);
  console.log(response);

  const id = transaction.id;
  const imageUrl = id ? `https://arweave.net/${id}` : undefined;
  console.log("imageUrl", imageUrl);

  // Upload metadata to Arweave

  const metadata = {
    name: "Custom NFT #1",
    symbol: "CNFT",
    description: "A description about my custom NFT #1",
    seller_fee_basis_points: 500,
    external_url: "https://www.customnft.com/",
    attributes: [
      {
        trait_type: "NFT type",
        value: "Custom",
      },
    ],
    collection: {
      name: "Test Collection",
      family: "Custom NFTs",
    },
    properties: {
      files: [
        {
          uri: imageUrl,
          type: "image/png",
        },
      ],
      category: "image",
      maxSupply: 0,
      creators: [
        {
          address: "CBBUMHRmbVUck99mTCip5sHP16kzGj3QTYB8K3XxwmQx",
          share: 100,
        },
      ],
    },
    image: imageUrl,
  };

  const metadataRequest = JSON.stringify(metadata);

  const metadataTransaction = await arweave.createTransaction({
    data: metadataRequest,
  });

  metadataTransaction.addTag("Content-Type", "application/json");

  await arweave.transactions.sign(metadataTransaction, wallet);

  console.log("metadata txid", metadataTransaction.id);

  console.log(await arweave.transactions.post(metadataTransaction));
})();

from arweave.arweave_lib import Wallet, Transaction, API_URL
import json

# Load your arweave wallet
your_ar_wallet = Wallet('wallet.json')

with open('./code/nfts/arweave-upload/lowres-dog.png', 'rb') as f:
    img_in_bytes = f.read()

# Upload image to Arweave
transaction = Transaction(your_ar_wallet, data=img_in_bytes)
transaction.add_tag('Content-Type', 'image/png')
transaction.sign()
transaction.send()

image_url = API_URL+"/"+transaction.id

# Define metadata
metadata = {
    "name": "Custom NFT #1",
    "symbol": "CNFT",
    "description": "A description about my custom NFT #1",
    "seller_fee_basis_points": 500,
    "external_url": "https://www.customnft.com/",
    "attributes": [
        {
            "trait_type": "NFT type",
            "value": "Custom"
        }
    ],
    "collection": {
        "name": "Test Collection",
        "family": "Custom NFTs",
    },
    "properties": {
        "files": [
            {
                "uri": image_url,
                "type": "image/png",
            },
        ],
        "category": "image",
        "maxSupply": 0,
        "creators": [
            {
                "address": "CBBUMHRmbVUck99mTCip5sHP16kzGj3QTYB8K3XxwmQx",
                "share": 100,
            },
        ],
    },
    "image": image_url,
}

# Upload metadata to Arweave
meta_transaction = Transaction(your_ar_wallet, data=json.dumps(metadata))
meta_transaction.add_tag('Content-Type', 'text/html')
meta_transaction.sign()
meta_transaction.send()

metadata_url = API_URL+"/"+meta_transaction.id

print(metadata_url)

Mint the NFT

If you already have the image and metadata uploaded, you can mint the NFT with the following code.

Press </> button to view full source
import { Metaplex, keypairIdentity } from "@metaplex-foundation/js";
import {
  Connection,
  clusterApiUrl,
  Keypair,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";
import dotenv from "dotenv";

dotenv.config();

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
  const keypair = Keypair.fromSecretKey(
    Buffer.from(JSON.parse(process.env.SOLANA_KEYPAIR!.toString()))
  );

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

  const feePayerAirdropSignature = await connection.requestAirdrop(
    keypair.publicKey,
    LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(feePayerAirdropSignature);

  const mintNFTResponse = await metaplex.nfts().create({
    uri: "https://ffaaqinzhkt4ukhbohixfliubnvpjgyedi3f2iccrq4efh3s.arweave.net/KUAIIbk6p8oo4XHRcq0U__C2r0mwQaNl0gQow4Qp9yk",
    maxSupply: 1,
  });

  console.log(mintNFTResponse);
})();

Note

You cannot mint an NFT with a different creator than your wallet. If you run into creator issues, make sure your metadata lists you as the creator.

How to get NFT Metadata

Metaplex NFTs have metadata that is stored on Arweave. In order to get the Arweave metadata, you must get the Metaplex PDA and decode the account data.

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

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

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

  const mint = new PublicKey("Ay1U9DWphDgc7hq58Yj1yHabt91zTzvV2YJbAWkPNbaK");

  const nft = await metaplex.nfts().findByMint(mint);

  console.log(nft.metadata);
  /*
  {
    name: 'SMB #139',
    symbol: 'SMB',
    description: 'SMB is a collection of 5000 randomly generated 24x24 pixels NFTs on the Solana Blockchain. Each SolanaMonkey is unique and comes with different type and attributes varying in rarity.',
    seller_fee_basis_points: 600,
    image: 'https://arweave.net/tZrNpbFUizSoFnyTqP4n2e1Tf7WvP3siUwFWKMMid_Q',
    external_url: 'https://solanamonkey.business/',
    collection: { name: 'SMB Gen2', family: 'SMB' },
    attributes: [
      { trait_type: 'Attributes Count', value: 2 },
      { trait_type: 'Type', value: 'Solana' },
      { trait_type: 'Clothes', value: 'Orange Shirt' },
      { trait_type: 'Ears', value: 'None' },
      { trait_type: 'Mouth', value: 'None' },
      { trait_type: 'Eyes', value: 'Cool Glasses' },
      { trait_type: 'Hat', value: 'None' }
    ],
    properties: {
      files: [ [Object], [Object] ],
      category: 'image',
      creators: [ [Object] ]
    }
  }
  */
})();

How to get the owner of an NFT

If you have the mint key of an NFT, you can find its current owner by sneak-peeking at the largest token account for that mint key.

Remember that NFTs have a supply of 1, and they are indivisible, meaning that only one token account will hold that token at any point in time, whilst all other token accounts for that mint key will have a balance of 0.

Once the largest token account is identified, we can retrieve its owner.

Press </> button to view full source
import { Connection, PublicKey } from "@solana/web3.js";

(async () => {
  const connection = new Connection("https://api.mainnet-beta.solana.com");
  const tokenMint = "9ARngHhVaCtH5JFieRdSS5Y8cdZk2TMF4tfGSWFB9iSK";

  const largestAccounts = await connection.getTokenLargestAccounts(
    new PublicKey(tokenMint)
  );
  const largestAccountInfo = await connection.getParsedAccountInfo(
    largestAccounts.value[0].address
  );
  console.log(largestAccountInfo.value.data.parsed.info.owner);
  /*
    PublicKey {
        _bn: <BN: 6ddf6e1d765a193d9cbe146ceeb79ac1cb485ed5f5b37913a8cf5857eff00a9>
    }
     */
})();

How to get NFT Mint Addresses

If you know the public key of the Candy Machine, you can get the list of all NFT mint addresses generated from that Candy Machine using the following code. Note that we can use the following memcmp filter because, in v1, the first creator is always the address of the Candy Machine.

Candy Machine V1

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import { Connection, clusterApiUrl, PublicKey } from "@solana/web3.js";
import bs58 from "bs58";

const connection = new Connection(clusterApiUrl("mainnet-beta"));
const MAX_NAME_LENGTH = 32;
const MAX_URI_LENGTH = 200;
const MAX_SYMBOL_LENGTH = 10;
const MAX_CREATOR_LEN = 32 + 1 + 1;
const MAX_CREATOR_LIMIT = 5;
const MAX_DATA_SIZE =
  4 +
  MAX_NAME_LENGTH +
  4 +
  MAX_SYMBOL_LENGTH +
  4 +
  MAX_URI_LENGTH +
  2 +
  1 +
  4 +
  MAX_CREATOR_LIMIT * MAX_CREATOR_LEN;
const MAX_METADATA_LEN = 1 + 32 + 32 + MAX_DATA_SIZE + 1 + 1 + 9 + 172;
const CREATOR_ARRAY_START =
  1 +
  32 +
  32 +
  4 +
  MAX_NAME_LENGTH +
  4 +
  MAX_URI_LENGTH +
  4 +
  MAX_SYMBOL_LENGTH +
  2 +
  1 +
  4;

const TOKEN_METADATA_PROGRAM = new PublicKey(
  "metaqbxxUerdq28cj1RbAWkYQm3ybzjb6a8bt518x1s"
);
const candyMachineId = new PublicKey("ENTER_YOUR_CANDY_MACHINE_ID_HERE");

const getMintAddresses = async (firstCreatorAddress: PublicKey) => {
  const metadataAccounts = await connection.getProgramAccounts(
    TOKEN_METADATA_PROGRAM,
    {
      // The mint address is located at byte 33 and lasts for 32 bytes.
      dataSlice: { offset: 33, length: 32 },

      filters: [
        // Only get Metadata accounts.
        { dataSize: MAX_METADATA_LEN },

        // Filter using the first creator.
        {
          memcmp: {
            offset: CREATOR_ARRAY_START,
            bytes: firstCreatorAddress.toBase58(),
          },
        },
      ],
    }
  );

  return metadataAccounts.map((metadataAccountInfo) =>
    bs58.encode(metadataAccountInfo.account.data)
  );
};

getMintAddresses(candyMachineId);

Candy Machine V2

If you're using a Candy Machine v2, you'll first need to access its "Candy Machine Creator" address which is a simple PDA using candy_machine and the Candy Machine v2 address as seeds. Once you have the creator address, you can use it the same way we were for v1.

Press </> button to view full source
import { Connection, clusterApiUrl, PublicKey } from "@solana/web3.js";
import bs58 from "bs58";

const connection = new Connection(clusterApiUrl("mainnet-beta"));
const MAX_NAME_LENGTH = 32;
const MAX_URI_LENGTH = 200;
const MAX_SYMBOL_LENGTH = 10;
const MAX_CREATOR_LEN = 32 + 1 + 1;
const MAX_CREATOR_LIMIT = 5;
const MAX_DATA_SIZE =
  4 +
  MAX_NAME_LENGTH +
  4 +
  MAX_SYMBOL_LENGTH +
  4 +
  MAX_URI_LENGTH +
  2 +
  1 +
  4 +
  MAX_CREATOR_LIMIT * MAX_CREATOR_LEN;
const MAX_METADATA_LEN = 1 + 32 + 32 + MAX_DATA_SIZE + 1 + 1 + 9 + 172;
const CREATOR_ARRAY_START =
  1 +
  32 +
  32 +
  4 +
  MAX_NAME_LENGTH +
  4 +
  MAX_URI_LENGTH +
  4 +
  MAX_SYMBOL_LENGTH +
  2 +
  1 +
  4;

const TOKEN_METADATA_PROGRAM = new PublicKey(
  "metaqbxxUerdq28cj1RbAWkYQm3ybzjb6a8bt518x1s"
);
const CANDY_MACHINE_V2_PROGRAM = new PublicKey(
  "cndy3Z4yapfJBmL3ShUp5exZKqR3z33thTzeNMm2gRZ"
);
const candyMachineId = new PublicKey("ENTER_YOUR_CANDY_MACHINE_ID_HERE");

const getMintAddresses = async (firstCreatorAddress: PublicKey) => {
  const metadataAccounts = await connection.getProgramAccounts(
    TOKEN_METADATA_PROGRAM,
    {
      // The mint address is located at byte 33 and lasts for 32 bytes.
      dataSlice: { offset: 33, length: 32 },

      filters: [
        // Only get Metadata accounts.
        { dataSize: MAX_METADATA_LEN },

        // Filter using the first creator.
        {
          memcmp: {
            offset: CREATOR_ARRAY_START,
            bytes: firstCreatorAddress.toBase58(),
          },
        },
      ],
    }
  );

  return metadataAccounts.map((metadataAccountInfo) =>
    bs58.encode(metadataAccountInfo.account.data)
  );
};

const getCandyMachineCreator = async (
  candyMachine: PublicKey
): Promise<[PublicKey, number]> =>
  PublicKey.findProgramAddress(
    [Buffer.from("candy_machine"), candyMachine.toBuffer()],
    CANDY_MACHINE_V2_PROGRAM
  );

(async () => {
  const candyMachineCreator = await getCandyMachineCreator(candyMachineId);
  getMintAddresses(candyMachineCreator[0]);
})();

How to get all NFTs from a wallet?

When getting all NFTs from a wallet, you'll need to get all token accounts and then parse which ones are NFTs. This can all be done using findDataByOwneropen in new window from the Metaplex js library.

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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);

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