The right way to Use a Web3 JS Name Contract Operate – Moralis Web3

Have you ever been questioning methods to use a Web3 JS name contract operate however couldn’t discover a easy answer? If that’s the case, the next code snippet is all you want:

const response = await Moralis.EvmApi.utils.runContractFunction({

Due to the “runContractFunction” endpoint from Moralis, now you can use your JavaScript (JS) expertise to work together with good contracts. Now, when you’ve labored with Moralis earlier than, precisely what to do with the above strains of code. Nevertheless, if that is your first rodeo with this final Web3 API supplier, make certain to finish the tutorial offered on this article, which is able to train you methods to use a Web3 JS name contract operate. To prepare for that feat, don’t overlook to create your free Moralis account.   

scale with moralis


As you might know, JavaScript (JS) continues to be the preferred programming language for net growth. Moreover, because of distinctive options, like these supplied by Moralis, JS is shaping to be the go-to language for decentralized functions (dapps) as nicely. Consequently, your JavaScript proficiency is all it’s good to be a part of the Web3 revolution that’s already disrupting numerous industries. Furthermore, whereas good contracts play an important position in how issues operate on the blockchain, you don’t need to be taught to write down good contracts to start out creating killer dapps. Certain, down the highway, you’ll in all probability deal with that side of Web3 growth; nevertheless, you’ll be able to construct all kinds of dapps that work together with current good contracts. That is the place a correct Web3 JS name contract operate simplifies issues.  

a block engraved with the title javascript

Shifting ahead, we’ll first aid you perceive what a Web3 JS name contract operate is within the first place. Whereas protecting that, additionally, you will study “name” and “ship” good contract features. Then, we’ll take you thru a step-by-step tutorial that can assist you correctly implement the above-presented code snippet. You’ll discover ways to receive your Moralis Web3 API key, set up the JS SDK, and methods to name good contract operate from JavaScript by way of an instance NFT undertaking. By finishing this tutorial, you’ll be able to make the most of the remainder of Moralis’ API. Furthermore, that is the place the EVM API documentation will aid you take issues to the following stage. 

graph illustrating a web3 js call contract function reading data from a series of blocks in a blockchain network

JavaScript (JS) for Web3 Contract Capabilities

JavaScript is the main programming language and can be fairly influential and impactful. Therefore, utilizing it with Web3 programming can velocity up the adoption of latest applied sciences. Nevertheless, earlier than you begin working with a Web3 JS name contract operate, it’s good to perceive what Web3 contract strategies or features are. To know the latter, it’s good to know the fundamentals of Web3 and good contracts. 

Web3’s rising iteration of the net was initiated with the start of blockchain expertise. Whereas Web1 was read-only, it advanced into Web2, which perfected read-write functionalities. Additionally, word that Web2 is the web that the majority customers make the most of. Nevertheless, Web3 is evolving quick as an increasing number of individuals begin to admire its potential. Moreover, Web3 takes the options of Web2 and provides the possession element by way of decentralized networks corresponding to Ethereum. In fact, we’re nonetheless within the early section of the Web3 period, the place primarily devs and tech-savvy people use the decentralized web. That mentioned, blockchain use circumstances, corresponding to transactions by way of Bitcoin with out intermediaries, and NFTs the place customers can really personal objects 100%, are making a number of noise, and mainstream adoption is poised to occur within the upcoming years. 

web1, web2, and web3 js call contract functions compared

Moreover, programmable blockchains (Ethereum, BNB Chain, Polygon, and so on.) assist on-chain items of software program or applications often known as good contracts. These Web3 contracts automate all kinds of outlined actions as predefined situations finalize. Consequently, these on-chain contracts appear to be the important thing to establishing an automatic, truthful, and clear future.

hologram showcasing blockchain components such as wallets, a blockchain, nodes, and web3 js contract functions working together

What’s a Web3 JS Name Contract Operate?

By this level, what JS, Web3, and good contracts are. Therefore, we solely want to deal with the features to finish the puzzle. Nevertheless, you in all probability already know that features (in programming) are units of directions that carry out varied duties. It’s value mentioning that whereas there are some technical variations between features and strategies, you’ll see the phrases used interchangeably most of the time. 

All in all, Web3 contract features or strategies are components of good contracts. On the identical time, the “Web3 contract features” time period additionally refers to Net API features or strategies that allow interplay with good contracts. Moreover, “JS” signifies that you should use JavaScript to work with these features. Nonetheless, the “name” phrase focuses on the “name” features, which focus on explicit forms of good contract features. Now, let’s hone in on “name” and “ship” features within the following part.  

man with a pencil manually writing a web3 js call contract function on a piece of paper

Name vs Ship – Their Variations and Advantages

Above, we talked about “name” features. A lot of these features are answerable for interacting with the “learn” features of good contracts. Basically, these are read-only features that don’t contain the method of sending transactions. Thus, you’ll be able to name them with out executing a blockchain transaction. Furthermore, since these features don’t contain on-chain transactions, they don’t modify the state of the blockchain (contract’s storage). Therefore, we use “name” once we wish to learn contract information. So, a Web3 JS name contract operate can be utilized to set off good contracts’ “learn” features to fetch particular storage variables of the deployed good contract. 

Be aware: The “Moralis.EvmApi.utils.runContractFunction” technique supplied on the high of the article is a Web3 JS name contract operate. By definition, it could possibly solely be used to name “learn” contract features.

Good contracts additionally embrace “write” features, which contain sending on-chain transactions. As such, the “write” good contract features change the contract’s storage. They accomplish that by executing on-chain transactions, which change into a part of the up to date state of the blockchain. Moreover, the Web3 JS strategies that set off “write” are often known as the “ship” operate.


Good Contract Instance

The above definitions of “name” and “ship” clarifies the core distinction between the 2 forms of features. It additionally depicts the core profit of every kind – the non-invasiveness of 1 and the ability to vary the state of the blockchain of the opposite. As well as, a Web3 JS name contract operate additionally doesn’t require any fuel charges. Nonetheless, we consider that taking a look at an precise good contract can additional clear the air. That mentioned, the contract we’ll take a look at is the good contract we’ll concentrate on within the upcoming tutorial.  

The next screenshots ought to be clear. But, we advocate visiting Etherscan to discover varied good contracts. Furthermore, we randomly determined to concentrate on the “Cool Cats” NFT instance:

landing page of cool cats nft contract on etherscan

Once we scroll down on the above web page, we get to the next menu bar:

write contract landing page of cool cats contract

Because the screenshot suggests, we have to choose the “Contract” tab. By doing so, we get to see the “Code”, “Learn Contract”, and “Write Contract” choices. The primary choice allows you to view the whole code of the chosen good contract. Alternatively, the second and third choices allow you to work together with the contract by way of its “learn” and “write” features. Basically, this part of Etherscan lets you “manually” do what Web3 name/ship contract features automate.

In the event you once more concentrate on the above picture, you’ll be able to see the “Connect with Web3” button. The latter seems once we choose the “Write Contract” choice. This is a sign that we should join our Web3 pockets. In any case, if we wish to execute this operate, we should pay the associated transaction charges. Nevertheless, once we choose the “Learn Contract” choice, there’s no “Connect with Web3” button. Furthermore, we are able to name any of the listed features:

read contract page with five information data columns

The right way to Use a Web3 JS Name Contract Operate

Lastly, it’s time we present you methods to use the Web3 JS name contract operate from the highest of the article. In the event you bear in mind, that operate makes use of Moralis’ “runContractFunction” endpoint. So, we encourage you to go to that endpoint’s documentation web page. Nevertheless, the next screenshot reveals the gist of the documentation web page to run contract operate:

run contract function documentation page with js alternative

By wanting on the picture above, you’ll be able to see that the “Moralis.EvmApi.utils.runContractFunction” Web3 JS name contract operate requires three parameters. We’d like the tackle, operate title, and ABI. As well as, it additionally takes in another optionally available parameters (be happy to discover them by yourself). 

Nevertheless, let’s now concentrate on implementing the code we are able to copy from the above “Request” discipline. In the event you resolve to observe our lead, you’ll full the next steps:

  1. Initialize a NodeJS undertaking
  2. Set up the Moralis SDK
  3. Get your Moralis Web3 API key (that is your gateway to the perfect Ethereum API in 2023) 
  4. Get hold of a wise contract’s ABI
  5. Implement the “runContractFunction” Web3 JS name contract operate

Initialize a NodeJS Challenge

First, create your “ContractFunctions” folder and use Visible Studio Code (VSC) or your favourite code editor to open it. Subsequent, use your terminal and enter the next command:

npm init -y

The above command will initialize a NodeJS undertaking, which might be mirrored within the newly-created “package deal.json” file:

package.json file

Then, create a brand new “index.js” file in the identical folder. You are able to do that manually or by utilizing this command:

contact index.js

Set up the Moralis SDK

The next command will set up Moralis’ SDK and the “dotenv” dependency:

npm i moralis dotenv

Be sure to additionally create your “.env” file. Don’t overlook to create the “MORALIS_KEY” variable inside that file:

env file inside vsc

Because the above screenshot signifies, it’s good to get your Moralis Web3 API key subsequent.

Get Your Moralis Web3 API Key

In case you haven’t created your free Moralis account, make certain to take action now. Together with your account up and operating, you’ll get to entry your Moralis admin space. From there, you’ll get to acquire your Web3 API key within the following two steps:

web3 api landing page showing two steps of how to copy the web3 api key

Then, merely paste the important thing into the “.env” file. Shifting on, open your “index.js” file and implement the code that can assist utilizing the Web3 JS name contract operate. So, begin by importing Moralis and requiring “.env”:

const Moralis = require(“moralis”).default;

Get hold of a Good Contract’s ABI

As talked about, we’ll use the “Cool Cats” NFT undertaking for instance. So, return to the Etherscan web page we explored above. This time, it’s good to concentrate on the “Code” choice and scroll all the way down to the “Contract ABI” part. Then, copy this contract’s ABI:

code structure of contract abi

Shifting ahead, paste the above-copied ABI into a brand new file (“abi.json”). Subsequent, rearrange the content material into strains by urgent “Shift+Possibility+F” on Mac (or Home windows/Linux equal) and save the adjustments. Nonetheless, it’s also possible to seek for “getPrice” – that is the operate title we’ll concentrate on. Furthermore, that is the “learn” kind of the good contract technique:

web3 js call contract function code structure

Implement the “runContractFunction” Web3 JS Name Contract Operate

With an instance ABI set in place, you’ll be able to implement the “runContractFunction” Web3 JS name contract operate. Open the “index.js” file and appoint “ABI” to the above-created “abi.json” file:

const ABI = require(“./abi.json”);

Lastly, you get to implement the code snippet from the highest of the article. For the sake of this instance undertaking, we’ll do that inside “Moralis.begin“, which may even initialize Moralis’ EVM API utilizing your Web3 API key:

		apiKey: course of.env.MORALIS_KEY
		const response = await Moralis.EvmApi.utils.runContractFunction({
    tackle: “0x1A92f7381B9F03921564a437210bB9396471050C”,
    functionName: “getPrice”
    abi: ABI



The strains above have been the ultimate piece of right now’s puzzle. Accordingly, you might now run your script with the next command:

node index.js

Have a look at your terminal to view the outcomes, which ought to show the preliminary token value for “Cool Cats” NFTs:

terminal results of calling the token price for cool cats

Be aware: Don’t let the above zeros idiot you. They’re associated to the truth that the costs in ETH are displayed with 18 decimal locations. Thus, the above worth equates to 0.02 ETH.

If you’re extra of a video individual, use the video under to discover right now’s tutorial in depth. Beginning at 6:36, you’re going to get to make use of the “runContractFunction” endpoint to name one other “learn” contract operate. Moreover, the video may even present you methods to make the most of the above-presented leads to one in all some ways (8:45).   

The right way to Use a Web3 JS Name Contract Operate – Abstract

All through the sections above, you had a possibility to discover ways to use JavaScript to work together with good contract features. Alongside the best way, you discovered the fundamentals of Web3, good contracts, and their “learn” and “write” strategies. You additionally discovered what “name” and “ship” Web3 features are. Lastly, you had a possibility to work with Moralis’ Web3 JS name contract operate.

In the event you loved right now’s tutorial, make certain to discover the Moralis docs additional. Additionally, we encourage you to develop your blockchain growth horizons by visiting the Moralis YouTube channel and the Moralis weblog. These two shops cowl numerous subjects. As an example, a few of the newest articles concentrate on an ethers.js tutorial and a Web3 py tutorial. As well as, you’ll be able to discover ways to get all transfers of an NFT and far more. Nonetheless, it’s also possible to take a extra skilled method to your crypto schooling by enrolling in Moralis Academy. Except for studying about blockchain fundamentals, that is additionally the place to grasp DeFi.    

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