NFT Metadata Storage – The right way to Retailer NFT Metadata

On this article, you’ll be taught what metadata for non-fungible tokens is, what NFT metadata storage is, and the best way to retailer NFT metadata in a non-decentralized method. After all, there are lots of cases the place NFTs must be saved in a totally decentralized method. Nevertheless, particular tasks might require some flexibility. As an illustration, let’s say that your challenge’s NFTs function a gateway or subscription affirmation, and also you need to supply your customers a special NFT picture each month. In that case, utilizing a centralized NFT metadata storage answer, such because the Firebase Storage bucket, can be the go-to possibility.      

Transferring ahead, we’ll deal with at this time’s matter by answering some vital questions in a simplified method. As an illustration, it’s essential to clarify the place the metadata for NFTs is saved and what you are able to do with the metadata. Relating to using NFT metadata, a dependable NFT API is the important thing. Luckily, you’ll be able to entry the final word NFT API together with your free Moralis account. With that instrument underneath your belt, you’ll be able to simply incorporate all types of NFTs throughout all main blockchains into your dapps. After all, we can even tackle an instance challenge to additional make clear the best way to retailer NFT metadata utilizing Firebase. As such, we’ll present you the best way to create a NodeJS backend utility to add an array of photographs and metadata. Lastly, you’ll additionally discover ways to use Remix to mint these instance NFTs on the Polygon testnet.  

What’s NFT Metadata?

If you wish to perceive what NFT metadata is, that you must know what NFTs are and what metadata is. As such, let’s have a look at these two phrases individually. NFTs, or non-fungible tokens, are distinctive kinds of blockchain belongings. Because the time period “non-fungible” suggests, there aren’t any two equal NFTs. After all, they might have the identical file representing them; nevertheless, their on-chain knowledge is exclusive. This makes them nice for digital artwork, digital collectibles, possession proofs, certificates, and many others. 

Alternatively, metadata, by definition, means “knowledge about knowledge”. As such, NFT metadata supplies you with all the small print a few particular NFT. The above picture is a good instance of that. Furthermore, since a big a part of each NFT is a few type of file (JPG, PNG, MP3, MP4, PDF, and many others.), metadata performs a key function. In any case, NFT recordsdata are too massive to be saved straight on the blockchain. Doing so would have catastrophic technical and monetary penalties. As an alternative, we retailer the recordsdata’ areas (amongst different particulars) within the NFT metadata. That’s the reason it’s important to know the best way to retailer NFT metadata.  

Moreover, metadata recordsdata sometimes come within the JSON file format. The precise particulars contained in the metadata might differ – in any case, there are completely different requirements of NFTs. Nevertheless, the preferred ones are ERC-721 and ERC-1155 NFTs. Of their instances, metadata often features a description, identify, picture (file) vacation spot, and attributes or traits. The latter comprise completely different trait-type worth pairs and are elective. You’ll be able to discover ways to add attributes to NFT metadata in one among our earlier articles. As well as, be certain to look intently on the picture under to solidify your understanding of NFT metadata.    

The place is the Metadata for NFTs Saved?

Though all of us purpose for a decentralized future, there are some cases the place you’ll be able to add worth to your customers by truly utilizing a centralized NFT metadata storage possibility. That mentioned, it’s apparent that the extent of decentralization of NFT tasks will depend on the strategy used to avoid wasting the NFT recordsdata and NFT metadata recordsdata. 

As such, the final word decentralized method can be to retailer NFT recordsdata and their metadata in a decentralized cloud storage answer (e.g., IPFS). Alternatively, a extra centralized method would contain storing these recordsdata and metadata in one of many centralized cloud storage providers. Moreover, a center floor can be doable. In that case, we might retailer NFT recordsdata utilizing a centralized storage answer, whereas the NFT metadata can be saved in a decentralized method. Furthermore, there are cases the place the particular utility of NFTs might require you to make use of one of many centralized storage alternate options. Nevertheless, it’s important to be totally clear and clarify to your NFT customers that the recordsdata and metadata will not be saved in a decentralized method as a way to allow them to select an alternative choice. That approach, you permit your customers to determine if the added worth outweighs the centralized method.

Nonetheless, remember the fact that the precise NFTs are nonetheless minted on a blockchain, which makes their contract handle and ID immutable. Furthermore, their URI hyperlinks pointing to NFT metadata will probably be saved on-chain. Now, in case you discover this data a bit complicated, don’t fear; the instance of the best way to retailer NFT metadata on Firebase will additional make clear issues.   

What Can You Do With the Metadata?

On the finish of the earlier part, you realized that, basically, NFT metadata is accessible through URI hyperlinks. As well as, these URIs comprise all the small print, together with the URL hyperlinks to the related NFT recordsdata. Therefore, you should utilize a high-quality, non-fungible token metadata API to acquire all the small print for explicit NFTs.

Moreover, Moralis presents the final word NFT API, which mixes all the things wanted to construct nice NFT apps. The Moralis NFT API lets you fetch real-time NFT metadata, possession knowledge, NFT switch knowledge, NFT costs, and extra. As such, you don’t must parse particular person good contracts, type by way of irregular knowledge units, take care of cleaning and stitching, or make tens of calls or question nodes to get the metadata. As an alternative, you simply make a single API name to retrieve the NFT data throughout any supported chain.

What’s extra, by utilizing Moralis, you’ll be able to create your individual NFT dashboard, a Web3 sport that comes with NFTs, an NFT market, and rather more. To additional discover the Moralis NFT API endpoints, go to the Moralis docs:

The right way to Retailer NFT Metadata on Firebase

On this part, you’ll discover ways to use the Firebase Storage bucket to retailer NFT metadata and pictures (or different recordsdata) in a centralized method. By taking this path, you’ll be able to change the photographs that your NFTs signify. Other than exhibiting you the best way to arrange Firebase and batch add recordsdata and metadata, we’ll additionally mint an instance NFT utilizing Remix. As such, you’ll be capable of totally grasp the speculation described within the earlier sections. Nonetheless, to get essentially the most out of this tutorial, we encourage you to roll up your sleeves and observe our lead. You can begin from scratch or you should utilize our repo on GitHub to entry the ultimate code. There, you can even discover instance photographs and metadata. 

Preliminary Setup Half 1 – Activating Your Firebase Storage Bucket

Star by accessing your Firebase console. There, you should utilize your current challenge or add a brand new one:

As soon as inside your Firebase challenge dashboard, increase the “Construct” menu and click on on the “Storage” possibility:

As soon as the “Storage” web page masses, click on on the “Get began” button:

After clicking on the above button, you’ll get to arrange Firebase’s cloud storage. Since that is an instance challenge, we suggest deciding on the take a look at mode. Then, transfer on by hitting “Subsequent”:

Lastly, full the setup by clicking on the “Finished” button:

Consequently, it is best to see the “Storage” web page on your challenge:

Transferring on, that you must create your new personal key. To take action, that you must entry the “Challenge settings” web page by clicking on the gear icon within the aspect menu:

Subsequent, choose the “Service accounts” tab:

Then, scroll down and be sure that “Node.js” is chosen:

Lastly, click on on the “Generate new personal key” button, adopted by a affirmation (a click on on “Generate key”) within the pop-up window:

Preliminary Setup Half 2 – Making a NodeJS Challenge

Be aware: You should use your favourite IDE; nevertheless, to keep away from any pointless confusion, we suggest you observe our lead and use Visible Studio Code (VSC).

First, create a folder on your NFT challenge and open it in VSC:

As you’ll be able to see within the above screenshot, we named our folder “MOONNFTS”. Furthermore, additionally be certain to have your terminal prepared. Subsequent, initialize a NodeJS challenge by getting into the next command:

npm init

Then, you simply must press “enter” a few occasions to finish the setup steps. Consequently, it is best to get a “package deal.json” file inside your challenge folder:

Transferring on, create an “index.js” file. You are able to do it manually or with the “contact index.js” command. With the “index.js” file in place, it’s time to put in the required dependencies. Therefore, use your terminal and enter the next:

npm i firebase-admin uuid

The above command will create a “node_modules” folder and a “package-lock.json” file. Your challenge explorer ought to look as follows:

Lastly, you additionally need to add the JSON file you downloaded from Firebase (from beforehand whenever you clicked on the “Generate key” button). You’ll be able to merely drag-and-drop it out of your browser:

Additionally, be certain to rename your file into one thing extra user-friendly (our instance: “serviceAccount.json”). By renaming that file, you’ve efficiently accomplished each components of the preliminary setup. Therefore, it’s time to start out coding the “index.js” file so it should retailer NFT metadata to Firebase correctly.

Code to Retailer NFT Metadata to the Firebase Storage Bucket

In the event you haven’t accomplished so but, open your “index.js” file. On the prime, require your dependencies with the next traces of code:

const firebaseAdmin = require(“firebase-admin”);
const { v4: uuidv4 } = require(“uuid”);
const serviceAccount = require(“./serviceAccount.json”);

Then, create an admin variable to make use of your credentials which can be within the “serviceAccount.json” file:

const admin = firebaseAdmin.initializeApp({
credential: firebaseAdmin.credential.cert(serviceAccount),

The above traces of code will offer you entry to your Firebase challenge. Subsequent, you additionally need to guarantee entry to your storage bucket:


To get your bucket identify, return to the “Storage” web page of your Firebase challenge:

Together with your Firebase challenge and storage bucket entry in place, that you must create a operate that can import recordsdata out of your folder to Firebase. 

Importing the NFT Recordsdata

In the event you keep in mind, the NFT metadata consists of the NFT file URL. As such, that you must first add the picture recordsdata. To do that, create the next operate:  

async operate uploadFile(path, filename) {

const storage = storageRef.add(path, {
public: true,
vacation spot: `picture/${filename}`,
metadata: {
metadata: {
firebaseStorageDownloadTokens: uuidv4(),

return storage

You additionally need to name the above-created operate:

(async () => {
for (let i = 1; i < 11; i++) {
await uploadFile(`./photographs/${i}.png`, `${i}.png`);
console.log(“Uploaded picture quantity ” + i);

As you’ll be able to see, the above “for” loop ensures that every one ten instance recordsdata in your folder get uploaded to Firebase and correctly named. Furthermore, earlier than you truly run the above “uploadFile” async operate, be certain so as to add folders with photographs to your challenge’s folder:

Be aware: Do not forget that you should utilize our instance picture recordsdata that await you on GitHub.

Together with your instance recordsdata in place, you’ll be able to run the next command to start out importing them:

node index.js

After working the above command, you’ll see the add progress in your terminal:

Furthermore, your Firebase’s “Storage” web page ought to replicate your progress:

For a extra detailed demonstration, use the video under (8:48). With the picture recordsdata efficiently uploaded, you can even create and add metadata recordsdata.

Creating and Importing the Metadata Recordsdata 

Be aware: For the sake of this tutorial, you don’t must create your JSON recordsdata. As an alternative, you should utilize our metadata recordsdata. Simply be certain to make use of your addresses (video under, beginning at 9:30). 

Begin by making a “metadata” folder and populate it with ten JSON recordsdata:

Together with your metadata recordsdata prepared, you should utilize the “index.js” file to add them to your Firebase Storage bucket, which can function an NFT metadata storage. To do that, simply exchange “picture” with “metadata” and “png” with “json” (10:40):

async operate uploadFile(path, filename) {

const storage = storageRef.add(path, {
public: true,
vacation spot: `metadata/${filename}`,
metadata: {
metadata: {
firebaseStorageDownloadTokens: uuidv4(),

return storage


(async () => {
for (let i = 1; i < 11; i++) {
await uploadFile(`./metadata/${i}.json`, `${i}.json`);
console.log(“Uploaded meta quantity ” + i);

Final however not least, run the “node index.js” command once more. Consequently, it is best to now have your NFT picture recordsdata and the corresponding metadata efficiently uploaded:

Creating Instance NFTs

Now that you’ve correctly saved all of the substances, for instance, NFTs, it’s time to create precise NFTs. To try this, we’re handing you over to the video tutorial under, beginning at 12:12. That is the place you’ll have an opportunity to observe one among our in-house specialists’ lead as he makes use of Remix to mint instance NFTs on Polygon’s testnet. Basically, you’re going to get to create a easy NFT good contract and deploy it to mint your individual NFTs. To do that, you’ll need your MetaMask pockets and a few take a look at MATIC. 

Furthermore, beginning at 17:43, you’ll additionally see the best way to use the Moralis documentation to see the ability of Moralis’ NFT API. Final however not least, you’ll additionally be capable of view your instance NFTs on OpenSea (18:40).

Right here’s the video tutorial that we’ve been referencing all through the article:

NFT Metadata Storage – The right way to Retailer NFT Metadata – Abstract

We began at this time’s dialogue by explaining what NFT metadata is. We then checked out the place the metadata for NFTs is saved. That’s the place you realized about completely different NFT metadata storage choices. Furthermore, you realized concerning the Moralis NFT API and the way it can assist you simply create all types of NFT dapps. Lastly, we took on an instance challenge the place you had an opportunity to see firsthand the best way to retailer NFT metadata within the Firebase Storage bucket. As a bonus, you additionally had a possibility to mint instance NFTs by following the above video tutorial.

In the event you loved at this time’s tutorial, we suggest you discover the Moralis documentation, the Moralis YouTube channel, and the Moralis weblog. There yow will discover different dapp and NFT growth tutorials, and these shops are nice locations to develop into Web3-educated. As an illustration, a few of the newest subjects deal with explaining what the Aptos blockchain and Sui blockchain are, constructing Ethereum dapps, making a Web3 Firebase login with MetaMask, the best way to create an NFT challenge, and rather more.

Alternatively, you’ll be able to take a extra skilled method to your crypto training. By enrolling in Moralis Academy, you’ll be able to develop into blockchain licensed and considerably improve your probabilities of going full-time crypto sooner quite than later. If NFTs are your favourite cup of tea, you may need to begin by studying the best way to construct an NFT market.    

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