Introduction to Scaffold-ETH 🏗

December 29, 2021

Overview

Developing applications involves juggling several moving pieces like front-ends, back-ends, and databases. But developing a decentralized application on a blockchain adds a few more elements like smart contracts and nodes that allow you to connect to the blockchain. 

Managing these pieces can become arduous if you are just starting as a developer wanting to develop a decentralized blockchain application. Scaffold-ETH gives you a jump start with its application pack. In this guide, we will learn how to set up and use Scaffold-ETH. 

Prerequisites
  • Node.js.
  • Yarn.
  • Git.
  • An Ethereum node.
  • Terminal/cms (CLI).

What is Scaffold-ETH

Scaffold-ETH is a framework to understand the workings of dApps, and it comes with a set of tools to make the Ethereum dApp building process faster and easier. The combination of tools used in Scaffold-ETH allows you to have a frontend for your smart contracts. The stack of tools for development are as follows:
  • Solidity - The programming language to write smart contracts.
  • Hardhat - A smart contract local environment tool to deploy and test smart contracts.
  • React - JS framework to build the frontend.
  • Ethers.js - Awesome Web3 JS library to interface with the blockchain.
  • Ant - Which is used for UI but can be changed as per preference like Atomize, React bootstrap, etc.

Setting up Scaffold-ETH environment

First of all, before getting started with Scaffold-ETH, your machine needs to have Yarn, Node.js, and Git installed.

Now, go to a directory where you would like to clone the Scaffold-ETH repository and follow these instructions.

Step one here is to clone the repository and install all the necessary packages; type the following in your terminal/cmd:

setting up scaffold eth environment

Copy
git clone https://github.com/scaffold-eth/scaffold-eth.git
cd scaffold-eth
yarn install

This will clone the repo, make the `scaffold-eth` your working directory, and install yarn packages.

Working with Scaffold-eth

Scaffold-ETH comes with a demo contract and a front-end. Let us try to run that and understand what it does under the hood.

Type the following in your terminal/cmd window:

working with scaffold eth

Copy
yarn chain

What this will do is start the Hardhat network, which is a local Ethereum network for development. Once the process is completed, you will see a message similar to this.


Now, let us try to deploy the contract, you can find a demo available at /packages/hardhat/contracts/YourContract.sol. Open a new terminal/cmd window, go to the scaffold-eth directory and type the following:

working with scaffold eth

Copy
yarn deploy

Here, we are telling Hardhat to deploy the smart contract to the Hardhat local network, which we started in the last step. The deployment script can be found under /packages/hardhat/deploy/ 00_deploy_your_contract.js

You will see a message similar to this when the contract deploys.


Now that we have deployed the contract, it's time to fire up the application. To do so, open a third terminal window and type the following:

working with scaffold eth

Copy
yarn start

This will launch the React app, which uses the local network and deployed contract. Once the server starts, the app runs on https://localhost:3000.

And it should look something like this.


We can now walk through the demo contract YourContract.sol which is working behind this frontend app.

working with scaffold eth

Copy
pragma solidity >=0.8.0 <0.9.0;
//SPDX-License-Identifier: MIT

import "hardhat/console.sol";
//import "@openzeppelin/contracts/access/Ownable.sol"; //https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol

contract YourContract {

  //event SetPurpose(address sender, string purpose);

  string public purpose = "Building Unstoppable Apps!!!";

  constructor() {
    // what should we do on deploy?
  }

  function setPurpose(string memory newPurpose) public {
      purpose = newPurpose;
      console.log(msg.sender,"set purpose to",purpose);
      //emit SetPurpose(msg.sender, purpose);
  }
}

Line 1: Declaring Solidity version.

Line 2: Specifying SPDX license type, which is an addition after Solidity ^0.6.8. 
Whenever the source code of a smart contract is made available to the public, these licenses can help resolve/avoid copyright issues. If you do not wish to specify any license type, you can use a special license UNLICENSED or simply skip the whole comment (it won’t result in an error, just a warning).

Line 4: Importing the Hardhat console contract (there is no contract; this is just to demo on how to import local contracts).

Line 7-11: Starting the contract YourContract and storing a string in the purpose variable.

Line 13-15: Example of contract constructor, which gets activated as soon as the contract is deployed.

Line 17-22: A function to take a new string as input and store it in newPurpose variable, then giving the value of newPurpose variable to the purpose variable, finally printing the string stored in the purpose variable.

Lets see this in action. On the homepage, you must see a message/string which we hard-coded in our contract.

We will change that by typing a new message in the setPurpose box and submit the transaction by clicking on send. This will store the new string in the newPurpose variable, which will be transferred to the purpose variable, ultimately displaying the new message on the page.

For example, here, we have set a new message as '>>>>>And keep building'


You can also connect this app with wallets like MetaMask by clicking the connect button on the top right. This shows an excellent example of connecting web apps with web3 wallets. Now, see how quickly we can set up QuickNode in the Scaffold-ETH setup.

Setting up QuickNode with Scaffold-eth

We will set up a QuickNode Rinkeby node; for that, first, get a free trial Rinkeby node from QuickNode. Head to the hardhat.config.js file, which you will find under the /packages/hardhat directory. Then find the Rinkeby network, add the QuickNode HTTP URL and a new variable 'url' and comment out the other 'url' variable. It will look similar to the image below.

  
You can also refer to this guide on How to create and deploy a smart contract with Hardhat, to learn more about Hardhat and how to set up QuickNode with Hardhat.

Conclusion

Congratulations, and thank you for making it here; I appreciate you! In this guide, you learned about Scaffold-ETH, how to install Scaffold-ETH and how to set it up. Special thanks to Austin Griffith for creating such a fantastic tool that enables us to kick start our dApp development journey. To find out about the ins and outs of Scaffold-ETH check out their official documentation.

Subscribe to our newsletter for more articles and guides on Ethereum. If you have any feedback, feel free to reach out to us via Twitter. You can always chat with us on our Discord community server, featuring some of the coolest developers you’ll ever meet :)

Related articles 54

How to Send a Transaction On Solana Using JavaScript
Apr 13, 2022

Hello reader! Today is an exhilarating day because we are going on an expedition to the Solana Blockchain. Solana is an up-and-coming blockchain seeking to improve upon the current ecosystem's solutions to the complex problem of providing a secure, scalable, decentralized...

Continue reading
How to do a non-custodial transaction with QuickNode
Apr 12, 2022

Private keys are one of the most sensitive pieces of data when it comes to cryptography and the blockchain. However, there has always been debate/confusion about choosing between custodial wallets (where the wallet provider has custody of the user’s private key) and...

Continue reading
How to connect to Ethereum using .NET (Nethereum)
Apr 12, 2022

Dotnet or .NET is very popular for the development of desktop applications, most Windows desktop applications are built using .NET, and it also contributes largely to web application’s tech stack. In this guide, let’s see how we can connect to Ethereum using .NET and

Continue reading
How to Set Up a Near Project from Scratch
Jan 27, 2022

In this tutorial we will look at how we can setup a basic NEAR project from scratch, installing and configuring dependencies and customizing the project to work well with AssemblyScript.We will first start by initializing our project with a package.json file using...

Continue reading
Como crear y lanzar un ERC-721 (NFT)
Dec 29, 2021

Coleccionables digitales que son compatibles con ERC-721 se han vuelto muy populares desde el lanzamiento de Cryptokitties y han ganado adopción masiva en los últimos meses. Esta guía cubrirá la parte de creación y lanzamiento...

Continue reading
How to connect to Ethereum network using Java / Web3j
Apr 12, 2022

We can say that Java is one of the most versatile languages out there, and it continues to be relevant in today's time. Java is so popular because of its massive user base and use cases. In this guide/tutorial, we'll learn how to connect to the Ethereum Blockchain network...

Continue reading
How to integrate IPFS with Ethereum
Apr 12, 2022

It can be costly to store massive files on a blockchain mainnet, and this is where decentralized file storing systems like IPFS can come in handy. Sometimes, NFTs use IPFS as well. In this guide, we’ll cover how we can integrate IPFS with...

Continue reading
How to Connect to the Ethereum Network using Ruby
Jun 13, 2022

The Ruby programming language has a huge fanbase. Ruby was developed by its creator with an intention to invent a language developers can enjoy learning and using. Ruby has been largely accepted by developers all around the world since its launch, in fact, the biggest...

Continue reading
How to connect to Ethereum network with ethers.js
Apr 12, 2022

When someone thinks of developing a dApp the first tool that comes to their mind is web3.js which is pretty common because of its popularity in the community and wide use cases, dApp development has been consistently growing and there are a lot of developers who want to...

Continue reading
How to Mint an NFT on Solana
Apr 12, 2022

Updated at: April 10, 2022Welcome to another QuickNode guide on Solana - the up-and-coming blockchain that seeks to solve the scalability issues of Ethereum. We will be walking through step-by-step how to create an NFT on Solana. NFT, short for Non Fungible Token,...

Continue reading
The Web3 Developer Stack
Apr 12, 2022

A developer stack is a bag of technologies a developer possesses. For example, MEAN (MongoDB, Express.js, AngularJS/Angular, and Node.js) and MERN (MongoDB, Express.js, React, and Node.js) are common web developer stacks. Similarly, today we will learn more about the web3...

Continue reading
How to deploy a smart contract with Brownie
Apr 12, 2022

Python is one of the most versatile programming languages; from researchers running their test models to developers using it in heavy production environments, it has use cases in every possible technical field. In today's guide, we will learn about Brownie, a Python-based...

Continue reading
How to Get All Tokens Held by a Wallet in Solana
Jun 24, 2022

Hello readers! To kick off Solana Summer and the current whitelist meta, we thought it would be helpful to dig into all of the token accounts you and your users have using the getParsedProgramAccounts method. This tool is convenient for querying different...

Continue reading
Como crear un NFT en SOLANA
Dec 29, 2021

¡Hola querido lector! Bienvenidos a una nueva guía de Solana.Solana es una blockchain que promete mucho a la hora de intentar resolver los problemas de escalabilidad que podemos apreciar en otras blockchains, como Ethereum por...

Continue reading
How to Get Transaction Logs on Solana
Jun 28, 2022

Ever need to pull all the transactions associated with a Wallet? Want to see all of the mint transactions associated with a Candy Machine? Or maybe see transaction history of an NFT? Solana's getSignaturesForAddress method is a versatile tool that makes...

Continue reading
How to Send an EIP-1559 Transaction
Apr 12, 2022

While Ethereum has been trying to scale, it has encountered some gas price issues. Many layer 2 solutions and sidechains sprang into existence to solve this problem, but Ethereum is the main chain, and at some point, it has to be improved. EIP-1559 was introduced to...

Continue reading
How to Create an Address in Solana using JavaScript
Apr 12, 2022

Hello reader! Welcome to QuickNode's first Solana guide. Solana is an up-and-coming blockchain that seeks to solve the scalability issues that Ethereum has been handling. You will walk through step-by-step how to create a Solana address using the @solana/web3.js...

Continue reading
How to create your own DAO with Aragon
Apr 12, 2022

Blockchain provides us with the power of decentralization. Decentralization means the transfer of power to users/members rather than having a single centralized authority governing everything; it enables various use cases in finance, governance, voting, fundraising, etc....

Continue reading
How to Connect to Terra with JavaScript using Terra.js
Apr 12, 2022

Stablecoins have been bridging the gap between traditional currencies and blockchains. Stablecoins offer stable price tokens pegged by a reserve asset which is often a fiat current like USD, EUR, GBP. The Terra protocol provides a framework to work with stablecoins. This...

Continue reading
How to connect to Ethereum network using Go
Apr 12, 2022

Go helps you make faster scalable backends and this guide will show you how to connect your backend to Ethereum (and make it even faster, more reliable, and globally accessible, all thanks to QuickNode’s global infrastructure). What is...

Continue reading
How To Fork Ethereum Mainnet with Hardhat
Apr 12, 2022

Forking the chain at an older block of the blockchain is helpful if you want to simulate the blockchain’s state at that block; Hardhat has this functionality built in. In this guide, let’s go through the process of forking the Ethereum Mainnet at an older...

Continue reading
How to connect to Ethereum using PHP
Apr 12, 2022

PHP is a very popular choice among developers and has a vast community due to its long presence in web development. In this guide, we’ll cover how to connect to Ethereum with PHP using the web3.php...

Continue reading
How to use Subspace with QuickNode
Apr 12, 2022

In this guide, we'll understand a bit about reactive development and how to use Subspace with QuickNode.JavaScript is the programming language behind most of the internet apps and websites. JavaScript today has become one of the most used programming languages,...

Continue reading
How to Connect Your Dapp With MetaMask Using Ethers.js
Dec 29, 2021

In our dApp, we will have a simple react user interface that has a material button asking the user to connect to MetaMask. And if they do not have an account, they can create one or log in to their account. They will then view their wallet balance and address displayed on...

Continue reading
How to generate a new Ethereum address in Go
Dec 29, 2021

Golang is very popular among backend developers for building infrastructures and microservices. Go is a procedural programming language. Developed in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson at Google, then launched in 2009 as...

Continue reading
How to generate a new Ethereum address in Python
Dec 29, 2021

Python is one of the most versatile programming languages out there with an abundance of use cases; We can build many applications with Python from client-side to back end. In this guide, we will cover creating an Ethereum address in Python using the

Continue reading
How to Lazy Mint an NFT on Rarible with Rarepress
Apr 12, 2022

NFTs are great for creators to monetize their artwork and for people to get ownership of an item. But since gas prices are usually high given the highly in-demand space on Ethereum, minting an NFT or an NFT collection can become costly for a creator. Lazy minting solves...

Continue reading