Create Solana NFTs With Metaplex

Summary

Non-Fungible Tokens (NFTs) are SPL Tokens with an associated metadata account, 0 decimals, and a maximum supply of 1
Metadata attaches additional properties to token mints (both NFTs and regular tokens). For NFTs, metadata includes the token name and a link to an offchain JSON file. This JSON file contains links to artwork and other media files, any special traits the NFT has, and more.
The Metaplex Token Metadata program is an onchain program that attaches metadata to a token mint. We can interact with the Token Metadata program using the Token Metadata package via Umi, a tool made by Metaplex for working with onchain programs.

Lesson

Solana Non-Fungible Tokens (NFTs) are SPL tokens created using the Token program. These tokens, however, also have an additional metadata account associated with each token mint.

In this lesson, we'll cover the basics of how NFTs are represented on Solana, how to create and update them using the mpl-token-metadata npm module.

NFTs on Solana

An NFT is a standard token from the Token Program with the following characteristics:

Has 0 decimals, so it cannot be divided into parts
Comes from a token mint with a supply of 1, so only 1 of these tokens exists
Comes from a token mint whose authority is set to null (to ensure that the supply never changes)
Has an associated account that stores metadata - things like a name, symbol, images, etc.

While the first three points can be achieved with the SPL Token Program, the associated metadata requires an additional program. This is the Metadata program.

The Metaplex Token Metadata program

The most popular way Solana NFTs have been created is by using the Metaplex Token Metadata program.

Metadata

When creating an NFT, the Token Metadata program creates an onchain metadata account using a Program Derived Address (PDA) with the token mint as a seed. This allows the metadata account for any NFT to be located deterministically using the address of the token mint. The onchain metadata contains a URI field that points to an offchain .json file.
The offchain metadata in the JSON file stores the link to the media (images, videos, 3D files) of the NFT, any traits the NFT may have, and additional metadata (see this example JSON file). Permanent data storage systems such as Arweave are often used to store the offchain component of NFT metadata.

In the following sections, we'll cover the basics of using the metaplex-foundation/token-metadata plugin with Umi to prepare assets, create NFTs, update NFTs, and associate an NFT with a broader collection. For more information on metaplex-foundation/token-metadata see the developer docs for Token Metadata.

Info

Metaplex Core, is an NFT standard from Metaplex where asset details such as the owner, name, uri e.t.c are stored on a single account. However, the most common style of NFT is still by making a Solana SPL token with some Metadata attached via the Metaplex Metadata program, so that's what we'll be using in this tutorial.

UMI instance

Umi is a framework for making JS/TS clients for onchain programs, that was created by Metaplex. Umi can create JS/TS clients for many programs, but in practice, it's most commonly used to communicate to the Token Metadata program.

Note that Umi has different implementations for many concepts than web3.js, including Keypairs, PublicKeys, and Connections. However, it is easy to convert from web3.js versions of these items to the Umi equivalents.

Installation and setting up Umi

First we create a new Umi instance. We can do this by either providing our own RPC endpoint, or use the public facing Solana endpoints provided by the clusterApiUrl method.

import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { clusterApiUrl } from "@solana/web3.js";
 
const umi = createUmi(clusterApiUrl("devnet"));

Finally, we pass in the identity for our Umi instance (this is the keypair that will be used to sign transactions) and the plugins that we will use, in our case, this is the metaplex-foundation/mpl-token-metadata.

import { mplTokenMetadata } from "@metaplex-foundation/mpl-token-metadata";
import { keypairIdentity } from "@metaplex-foundation/umi";
import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { getKeypairFromFile } from "@solana-developers/helpers";
import { promises as fs } from "fs";
import { clusterApiUrl } from "@solana/web3.js";
 
const umi = createUmi(clusterApiUrl("devnet"));
 
// load keypair from local file system
// See https://github.com/solana-developers/helpers?tab=readme-ov-file#get-a-keypair-from-a-keypair-file
const localKeypair = await getKeypairFromFile();
 
// convert to Umi compatible keypair
const umiKeypair = umi.eddsa.createKeypairFromSecretKey(localKeypair.secretKey);
 
// load the MPL metadata program plugin and assign a signer to our umi instance
umi.use(keypairIdentity(umiKeypair)).use(mplTokenMetadata());

Uploading assets

Before creating an NFT, you must prepare and upload any assets you plan to associate with the NFT. While this doesn't have to be an image, most NFTs have an image associated with them.

Preparing and uploading an image involves converting the image to a buffer, converting the file to a generic file using the createGenericFile() function and finally uploading it to the designated Storage Driver.

The GenericFile type allows Umi to support different file variations despite the difference of browser files and local file system files i.e. those on your computer.

In action, uploading an image named random-image.png from your computer would take the following steps:

Reading the file using readFile into a buffer.
Creating a generic file type with the files MIME Type from the buffer and filePath.
Uploading file to designated storage provider.

let filePath = "random-image.png";
 
const buffer = await fs.readFile(filePath);
let file = createGenericFile(buffer, filePath, {
  // chose the correct file MIME type https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types
  contentType: "image/jpeg",
});
const [image] = await umi.uploader.upload([file]);

The function's return value will be the URI where the image was stored.

Upload metadata

After uploading an image, it's time to upload the offchain JSON metadata using the uploadJson() method. This will return a URI where the JSON metadata is stored.

Remember, the offchain portion of the metadata includes things like the image URI as well as additional information like the name and description of the NFT. While you can technically include anything you'd like in this JSON object, in most cases, you should follow the NFT standard to ensure compatibility with wallets, programs, and applications.

To create the metadata, use the uploadJson() method provided by the SDK. This method accepts a metadata object and returns a URI that points to the uploaded metadata.

const uri = await umi.uploader.uploadJson({
  name,
  description,
  image,
});

Create the NFT

After uploading the NFT's metadata, you can finally create the NFT on the network. The mplTokenMetadata plugin we added earlier provides the required helpers to create an NFT or any other token with minimal configuration. The helper createNft method will create the mint account, token account, metadata account, and master edition account for you. The data provided to this method will represent the onchain portion of the NFT metadata. You can explore the SDK to see all the other input optionally supplied to this method.

const { signature, result } = await createNft(umi, {
  mint,
  name: "My NFT",
  uri,
  updateAuthority: umi.identity.publicKey,
  sellerFeeBasisPoints: percentAmount(0),
}).sendAndConfirm(umi, { send: { commitment: "finalized" } });

The sendAndConfirm method is what takes care of signing our transaction and sending it. It also provides other options to set pre-flight checks and our desired commitment for the transaction, which defaults to confirmed if not provided.

This method returns an object containing the transaction signature and a result. The result object contains the outcome of our transaction. If successful, the err inside this will be set to null otherwise it'll contain the error for the failed transaction.

By default, the SDK sets the isMutable property to true, allowing for updates to be made to the NFT's metadata. However, you can choose to set isMutable to false, making the NFT's metadata immutable.

Update the NFT

If you've left isMutable as true, you may update your NFT's metadata.

The SDK's updateV1 method allows you to update both the onchain and offchain portions of the NFT's metadata. To update the offchain metadata, you'll need to repeat the steps of uploading a new image and metadata URI (as outlined in the previous steps), then provide the new metadata URI to this method. This will change the URI that the onchain metadata points to, effectively updating the offchain metadata as well.

const nft = await fetchMetadataFromSeeds(umi, { mintAddress });
 
await updateV1(umi, {
  mint,
  authority: umi.identity,
  data: {
    ...nft,
    sellerFeeBasisPoints: 0,
    name: "Updated Name",
  },
  primarySaleHappened: true,
  isMutable: true,
}).sendAndConfirm(umi);

Note that any fields you don't include in the call to updateV1 will stay the same, by design.

Add the NFT to a collection

A Certified Collection is an NFT that individual NFTs can belong to. Think of a large NFT collection like Solana Monkey Business. If you look at an individual NFT's Metadata you will see a collection field with a key that points to the Certified Collection NFT. Simply put, NFTs that are part of a collection are associated with another NFT that represents the collection itself.

Certified collections are important because they mean the collection owner has verified that each NFT actually belongs to the collection!

To add an NFT to a collection, first, the Collection NFT has to be created. The process is the same as before, except you'll include one additional field on our NFT Metadata: isCollection. This field tells the token program that this NFT is a Collection NFT.

const collectionMint = generateSigner(umi);
 
await createNft(umi, {
  mint: collectionMint,
  name: `My Collection`,
  uri,
  sellerFeeBasisPoints: percentAmount(0),
  isCollection: true,
}).sendAndConfirm(umi);

To mint an NFT into this collection, the Collection type which has two fields, the address of the collectionMint generated above and the verified field.

const { signature, result } = await createNft(umi, {
  mint,
  name: "My NFT",
  uri,
  updateAuthority: umi.identity.publicKey,
  sellerFeeBasisPoints: percentAmount(0),
  collection: { key: collectionMint.publicKey, verified: false },
}).sendAndConfirm(umi, { send: { commitment: "finalized" } });

When you checkout the metadata on your newly created NFT, you should now see a collection field like so:

"collection":{
  "verified": false,
  "key": "SMBH3wF6baUj6JWtzYvqcKuj2XCKWDqQxzspY12xPND"
}

The last thing you need to do is verify the NFT. This effectively just flips the verified field above to true, but it's incredibly important. This is what lets consuming programs and apps, including wallets and art marketplaces, know that your NFT is in fact part of the collection - because the Collection's owner has signed a transaction making the NFT a member of that collection. You can do this using the verifyCollectionV1 function:

const metadata = findMetadataPda(umi, { mint: mint.publicKey });
 
await verifyCollectionV1(umi, {
  metadata,
  collectionMint,
  authority: umi.identity,
}).sendAndConfirm(umi);

Lab

In this lab, we'll go through the steps to create an NFT using the Metaplex Umi framework, update the NFT's metadata after the fact, and then associate the NFT with a collection. By the end, you will have a basic understanding of how to use the Metaplex Umi and the mplTokenMetadata library to interact with NFTs on Solana.

Part 1: Creating an NFT collection

To begin, make a new folder and install the relevant dependencies:

npm i @solana/web3.js@1 @solana-developers/helpers@2 @metaplex-foundation/mpl-token-metadata @metaplex-foundation/umi-bundle-defaults @metaplex-foundation/umi-uploader-irys esrun

Then create a file called create-metaplex-nft-collection.ts, and add our imports:

import {
  createNft,
  mplTokenMetadata,
} from "@metaplex-foundation/mpl-token-metadata";
import {
  createGenericFile,
  generateSigner,
  keypairIdentity,
  percentAmount,
} from "@metaplex-foundation/umi";
import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { irysUploader } from "@metaplex-foundation/umi-uploader-irys";
import {
  airdropIfRequired,
  getExplorerLink,
  getKeypairFromFile,
} from "@solana-developers/helpers";
import { clusterApiUrl, Connection, LAMPORTS_PER_SOL } from "@solana/web3.js";
import { promises as fs } from "fs";
import * as path from "path";

Connect to devnet, load a user and Airdrop some SOL if needed:

// create a new connection to Solana's devnet cluster
const connection = new Connection(clusterApiUrl("devnet"));
 
// load keypair from local file system
// assumes that the keypair is already generated using `solana-keygen new`
const user = await getKeypairFromFile();
 
await airdropIfRequired(
  connection,
  user.publicKey,
  1 * LAMPORTS_PER_SOL,
  0.1 * LAMPORTS_PER_SOL,
);
 
console.log("Loaded user:", user.publicKey.toBase58());

Create a new Umi instance, assign it the loaded keypair, load the mplTokenMetadata to interact with the metadata program and irysUploader to upload our files.

const umi = createUmi(connection);
 
// load keypair from local file system
// See https://github.com/solana-developers/helpers?tab=readme-ov-file#get-a-keypair-from-a-keypair-file
const user = await getKeypairFromFile();
 
// convert to umi compatible keypair
const umiKeypair = umi.eddsa.createKeypairFromSecretKey(user.secretKey);
 
// assigns a signer to our umi instance, and loads the MPL metadata program and Irys uploader plugins.
umi
  .use(keypairIdentity(umiKeypair))
  .use(mplTokenMetadata())
  .use(irysUploader());

Download the image assets the collection image from the links below and save them inside your working directory,

We will use these images as our collection and nft cover images respectively.

We will use Irys as our storage provider, and Metaplex conveniently ships the umi-uploader-irys plugin we can use to upload our files. The plugin, also takes care of storage fees so that we don't have to worry about making this on our own.

Upload the offchain metadata to Irys:

const collectionImagePath = path.resolve(__dirname, "collection.png");
 
const buffer = await fs.readFile(collectionImagePath);
let file = createGenericFile(buffer, collectionImagePath, {
  contentType: "image/png",
});
const [image] = await umi.uploader.upload([file]);
console.log("image uri:", image);
 
// upload offchain json to Arweave using irys
const uri = await umi.uploader.uploadJson({
  name: "My Collection",
  symbol: "MC",
  description: "My Collection description",
  image,
});
console.log("Collection offchain metadata URI:", uri);

Then actually make the collection:

// generate mint keypair
const collectionMint = generateSigner(umi);
 
// create and mint NFT
await createNft(umi, {
  mint: collectionMint,
  name: "My Collection",
  uri,
  updateAuthority: umi.identity.publicKey,
  sellerFeeBasisPoints: percentAmount(0),
  isCollection: true,
}).sendAndConfirm(umi, { send: { commitment: "finalized" } });
 
let explorerLink = getExplorerLink(
  "address",
  collectionMint.publicKey,
  "devnet",
);
console.log(`Collection NFT:  ${explorerLink}`);
console.log(`Collection NFT address is:`, collectionMint.publicKey);
console.log("✅ Finished successfully!");

We advise using esrun to run the scripts because it allows you to use top level await without having to wrap your code inside asynchronous function.

Run the create-metaplex-nft-collection.ts script

npx esrun create-metaplex-nft-collection.ts

The output should look like this:

% npx esrun create-metaplex-nft-collection.ts

Loaded user: 4kg8oh3jdNtn7j2wcS7TrUua31AgbLzDVkBZgTAe44aF
image uri: https://arweave.net/XWpt7HDOFC0wJQcQWgP9n_cxHS0qQik9-27CAAaGP6E
Collection offchain metadata URI: https://arweave.net/atIf58t3FHa3heoOtNqPkVvEGC_9WzAduY0GQE-LnFI
Collection NFT:  https://explorer.solana.com/address/D2zi1QQmtZR5fk7wpA1Fmf6hTY2xy8xVMyNgfq6LsKy1?cluster=devnet
Collection NFT address is: D2zi1QQmtZR5fk7wpA1Fmf6hTY2xy8xVMyNgfq6LsKy1
✅ Finished successfully!

Congratulations! You've created a Metaplex Collection. Check this out on Solana Explorer using the URL above which should resemble

Solana Explorer with details about created collection

If you have any trouble, try and fix it yourself, but if you need to you can also check out the solution code.

We'll use the collection NFT address in the next step.

2. Creating a Metaplex NFT inside the collection

We'll now make a Metaplex NFT that's a member of the collection we just made. Make a new file called create-metaplex-nft.ts. The setup for this will look the same as the previous file, with slightly different imports:

import {
  createNft,
  findMetadataPda,
  mplTokenMetadata,
  verifyCollectionV1,
} from "@metaplex-foundation/mpl-token-metadata";
import {
  createGenericFile,
  generateSigner,
  keypairIdentity,
  percentAmount,
  publicKey as UMIPublicKey,
} from "@metaplex-foundation/umi";
import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { irysUploader } from "@metaplex-foundation/umi-uploader-irys";
import {
  airdropIfRequired,
  getExplorerLink,
  getKeypairFromFile,
} from "@solana-developers/helpers";
import { clusterApiUrl, Connection, LAMPORTS_PER_SOL } from "@solana/web3.js";
import { promises as fs } from "fs";
import * as path from "path";
// create a new connection to Solana's devnet cluster
const connection = new Connection(clusterApiUrl("devnet"));
 
// load keypair from local file system
// assumes that the keypair is already generated using `solana-keygen new`
const user = await getKeypairFromFile();
console.log("Loaded user:", user.publicKey.toBase58());
 
await airdropIfRequired(
  connection,
  user.publicKey,
  1 * LAMPORTS_PER_SOL,
  0.1 * LAMPORTS_PER_SOL,
);
 
const umi = createUmi(connection);
 
// convert to umi compatible keypair
const umiKeypair = umi.eddsa.createKeypairFromSecretKey(user.secretKey);
 
// load our plugins and signer
umi
  .use(keypairIdentity(umiKeypair))
  .use(mplTokenMetadata())
  .use(irysUploader());

Now let's tell Metaplex our collection, and the NFT we want to make:

// Substitute in your collection NFT address from create-metaplex-nft-collection.ts
const collectionNftAddress = UMIPublicKey("YOUR_COLLECTION_NFT_ADDRESS_HERE");
 
// example data and metadata for our NFT
const nftData = {
  name: "My NFT",
  symbol: "MN",
  description: "My NFT Description",
  sellerFeeBasisPoints: 0,
  imageFile: "nft.png",
};

We can then put out files into Irys:

const NFTImagePath = path.resolve(__dirname, "nft.png");
 
const buffer = await fs.readFile(NFTImagePath);
let file = createGenericFile(buffer, NFTImagePath, {
  contentType: "image/png",
});
 
// upload image and get image uri
const [image] = await umi.uploader.upload([file]);
console.log("image uri:", image);
 
// upload offchain json using irys and get metadata uri
const uri = await umi.uploader.uploadJson({
  name: "My NFT",
  symbol: "MN",
  description: "My NFT Description",
  image,
});
console.log("NFT offchain metadata URI:", uri);

And then create an NFT using the URI from the metadata:

// generate mint keypair
const mint = generateSigner(umi);
 
// create and mint NFT
await createNft(umi, {
  mint,
  name: "My NFT",
  symbol: "MN",
  uri,
  updateAuthority: umi.identity.publicKey,
  sellerFeeBasisPoints: percentAmount(0),
  collection: {
    key: collectionAddress,
    verified: false,
  },
}).sendAndConfirm(umi, { send: { commitment: "finalized" } });
 
let explorerLink = getExplorerLink("address", mint.publicKey, "devnet");
console.log(`Token Mint:  ${explorerLink}`);

Run npx esrun create-metaplex-nft.ts. If all goes well, you will see the following:

% npx esrun create-metaplex-nft.ts

Loaded user: 4kg8oh3jdNtn7j2wcS7TrUua31AgbLzDVkBZgTAe44aF
image uri: https://arweave.net/XgTss3uKlddlMFjRTIvDiDLBv6Pptm-Vx9mz6Oe5f-o
NFT offchain metadata URI: https://arweave.net/PK3Url31k4BYNvYOgTuYgWuCLrNjl5BrrF5lbY9miR8
Token Mint:  https://explorer.solana.com/address/CymscdAwuTRjCz1ezsNZa15MnwGNrxhGUEToLFcyijMT?cluster=devnet
Created NFT address is CymscdAwuTRjCz1ezsNZa15MnwGNrxhGUEToLFcyijMT
✅ Finished successfully!

Inspect your NFT at the address given! If you have any trouble, try and fix it yourself, but if you need to you can also check out the solution code.

You should have something similar to this image on your explorer page Solana Explorer with details about created NFT

Finally, let's verify our mint as being part of our collection. This makes it so the verified field in the onchain metadata is set to true, so consuming programs and apps can know for sure that the NFT in fact belongs to the collection.

Create a new file verify-metaplex-nft.ts, import the required libraries and instantiate a new umi Instance.

import {
  findMetadataPda,
  mplTokenMetadata,
  verifyCollectionV1,
} from "@metaplex-foundation/mpl-token-metadata";
import {
  keypairIdentity,
  publicKey as UMIPublicKey,
} from "@metaplex-foundation/umi";
import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { irysUploader } from "@metaplex-foundation/umi-uploader-irys";
import {
  airdropIfRequired,
  getExplorerLink,
  getKeypairFromFile,
} from "@solana-developers/helpers";
import { clusterApiUrl, Connection, LAMPORTS_PER_SOL } from "@solana/web3.js";
 
// create a new connection to Solana's devnet cluster
const connection = new Connection(clusterApiUrl("devnet"));
 
// load keypair from local file system
// assumes that the keypair is already generated using `solana-keygen new`
const user = await getKeypairFromFile();
console.log("Loaded user:", user.publicKey.toBase58());
 
await airdropIfRequired(
  connection,
  user.publicKey,
  1 * LAMPORTS_PER_SOL,
  0.1 * LAMPORTS_PER_SOL,
);
 
const umi = createUmi(connection);
 
// Substitute in your collection NFT address from create-metaplex-nft-collection.ts
const collectionAddress = UMIPublicKey("");
 
// Substitute in your NFT address from create-metaplex-nft.ts
const nftAddress = UMIPublicKey("");

Verifying an NFT will require you to have the collectionAddress you used created in the creation of a collection stage, and we will use the verifyCollectionV1 method.

// Verify our collection as a Certified Collection
// See https://developers.metaplex.com/token-metadata/collections
const metadata = findMetadataPda(umi, { mint: nftAddress });
await verifyCollectionV1(umi, {
  metadata,
  collectionMint: collectionAddress,
  authority: umi.identity,
}).sendAndConfirm(umi);
 
let explorerLink = getExplorerLink("address", nftAddress, "devnet");
console.log(`verified collection:  ${explorerLink}`);
console.log("✅ Finished successfully!");

Run npx esrun verify-metaplex-nft.ts. If all goes well, you will see the following:

% npx esrun create-metaplex-nft.ts

Loaded user: 4kg8oh3jdNtn7j2wcS7TrUua31AgbLzDVkBZgTAe44aF
verified collection: https://explorer.solana.com/address/CymscdAwuTRjCz1ezsNZa15MnwGNrxhGUEToLFcyijMT?cluster=devnet
✅ Finished successfully!

Inspect your verified NFT at the address given! If you have any trouble, try and fix it yourself, but if you need to you can also check out the solution code.

The verified flag on your NFT should now be set to 1 -> true showing that it's verified. To confirm this, look under the metadata tab on the Solana Explorer to confirm that your NFT is verified as part of the collection.

Solana Explorer with details about created NFT

Remember the NFT address, we'll use it in the next step.

3. Update the NFT

Create a new file, called update-metaplex-nft.ts. The imports will be similar to our previous files:

import {
  createNft,
  fetchMetadataFromSeeds,
  updateV1,
  findMetadataPda,
  mplTokenMetadata,
} from "@metaplex-foundation/mpl-token-metadata";
import {
  createGenericFile,
  generateSigner,
  keypairIdentity,
  percentAmount,
  publicKey as UMIPublicKey,
} from "@metaplex-foundation/umi";
import { createUmi } from "@metaplex-foundation/umi-bundle-defaults";
import { irysUploader } from "@metaplex-foundation/umi-uploader-irys";
import {
  airdropIfRequired,
  getExplorerLink,
  getKeypairFromFile,
} from "@solana-developers/helpers";
import { clusterApiUrl, Connection, LAMPORTS_PER_SOL } from "@solana/web3.js";
import { promises as fs } from "fs";
import * as path from "path";
 
// create a new connection to Solana's devnet cluster
const connection = new Connection(clusterApiUrl("devnet"));
 
// load keypair from local file system
// assumes that the keypair is already generated using `solana-keygen new`
const user = await getKeypairFromFile();
console.log("Loaded user:", user.publicKey.toBase58());
 
await airdropIfRequired(
  connection,
  user.publicKey,
  1 * LAMPORTS_PER_SOL,
  0.1 * LAMPORTS_PER_SOL,
);
 
const umi = createUmi(connection);
 
// convert to umi compatible keypair
const umiKeypair = umi.eddsa.createKeypairFromSecretKey(user.secretKey);
 
// load our plugins and signer
umi
  .use(keypairIdentity(umiKeypair))
  .use(mplTokenMetadata())
  .use(irysUploader());

Let's load our NFT, specifying the address from the previous example, and set up what we'd like to update:

// Load the NFT using the mint address
const mint = UMIPublicKey("YOUR_NFT_ADDRESS_HERE");
const asset = await fetchDigitalAsset(umi, mint);
 
// example data for updating an existing NFT
const updatedNftData = {
  name: "Updated Asset",
  symbol: "UPDATED",
  description: "Updated Description",
  sellerFeeBasisPoints: 0,
  imageFile: "nft.png",
};

We can then use Metaplex to update our NFT:

const NFTImagePath = path.resolve(__dirname, "nft.png");
 
const buffer = await fs.readFile(NFTImagePath);
let file = createGenericFile(buffer, NFTImagePath, {
  contentType: "image/png",
});
 
// upload new image and get image uri
const [image] = await umi.uploader.upload([file]);
console.log("image uri:", image);
 
// upload updated offchain json using irys and get metadata uri
const uri = await umi.uploader.uploadJson({
  name: "Updated ",
  symbol: "UPDATED",
  description: "Updated Description",
  image,
});
console.log("NFT offchain metadata URI:", uri);
 
// Load the NFT using the mint address
const mint = UMIPublicKey("Zxd9TmtBHQNti6tJxtx1AKYJFykNUwJL4rth441CjRd");
const nft = await fetchMetadataFromSeeds(umi, { mint });
 
await updateV1(umi, {
  mint,
  authority: umi.identity,
  data: {
    ...nft,
    sellerFeeBasisPoints: 0,
    name: "Updated Asset",
  },
  primarySaleHappened: true,
  isMutable: true,
}).sendAndConfirm(umi);
 
let explorerLink = getExplorerLink("address", mint, "devnet");
console.log(`NFT updated with new metadata URI: ${explorerLink}`);
 
console.log("✅ Finished successfully!");

Run npx esrun update-metaplex-nft.ts. You should see something like:

% npx esrun update-metaplex-nft.ts
 
Loaded user: 4kg8oh3jdNtn7j2wcS7TrUua31AgbLzDVkBZgTAe44aF
image uri: https://arweave.net/dboiAebucLGhprtknDQnp-yMj348cpJF4aQul406odg
NFT offchain metadata URI: https://arweave.net/XEjo-44GHRFNOEtPUdDsQlW5z1Gtpk2Wv0HvR8ll1Bw
NFT updated with new metadata URI: https://explorer.solana.com/address/Zxd9TmtBHQNti6tJxtx1AKYJFykNUwJL4rth441CjRd?cluster=devnet
✅ Finished successfully!

Inspect the updated NFT on Solana Explorer! Just like previously, if you have any issues, you should fix them yourself, but if needed the solution code is available.

Solana Explorer with details about the updated NFT

Congratulations! You've successfully learned how to use the Metaplex SDK to create, update, and verify NFTs as part of a collection. That's everything you need to build out your own collection for just about any use case. You could build a new event ticketing platform, revamp a retail business membership program, or even digitize your school's student ID system. The possibilities are endless!

Challenge

The steps covered above for creating an NFT would be incredibly tedious to execute for thousands of NFTs in one go. Many providers, including Metaplex, MagicEden, and Tensor have so-called 'fair launch' tools that take care of minting large quantities of NFTs and ensuring they are sold within the parameters set by their creators. Dive into one of these fair launch platforms and create an NFT. This hands-on experience will not only reinforce your understanding of the tools but also boost your confidence in your ability to use them effectively in the future.

Completed the lab?

Push your code to GitHub and tell us what you thought of this lesson!

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