Web3.js is a powerful library that enables developers to interact with the Ethereum blockchain. Here are some notable projects built using Web3.js, along with explanations of their functionalities.

1. Build a Web3 App with Solidity + Ethereum Smart Contracts

This project allows developers to learn Solidity, write, and deploy a smart contract to the Ethereum blockchain, and build a Web3 client app to interact with the contract. It is ideal for those curious about crypto and blockchain technology.

Tech Stack: Smart Contracts, Solidity, Ethereum

Link to the project

Sample Code

pragma solidity ^0.8.0;

contract SimpleStorage {
    uint256 storedData;

    function set(uint256 x) public {
        storedData = x;
    }

    function get() public view returns (uint256) {
        return storedData;
    }
}

2. Mint Your Own NFT Collection

This project guides users through the process of programmatically generating an NFT collection, writing and deploying a smart contract in Solidity, and building a React dApp to showcase the NFTs.

Tech Stack: NFT, Web 3.0

Link to the project

Sample Code

const { ethers } = require("hardhat");

async function main() {
    const NFT = await ethers.getContractFactory("MyNFT");
    const nft = await NFT.deploy();
    await nft.deployed();
    console.log("NFT deployed to:", nft.address);
}

main().catch((error) => {
    console.error(error);
    process.exitCode = 1;
});

3. Build Your Own DAO with JavaScript

This project focuses on creating a Decentralized Autonomous Organization (DAO) using JavaScript. It covers minting membership NFTs, creating and airdropping tokens, and governance using a token.

Tech Stack: DAO, JavaScript

Link to the project

Sample Code

const { ethers } = require("hardhat");

async function main() {
    const DAO = await ethers.getContractFactory("MyDAO");
    const dao = await DAO.deploy();
    await dao.deployed();
    console.log("DAO deployed to:", dao.address);
}

main().catch((error) => {
    console.error(error);
    process.exitCode = 1;
});

4. Build a Web3.0 Twitter Clone

This project involves creating a Twitter-like application on the blockchain. Users can save tweets on the blockchain and interact with them through a React frontend.

Tech Stack: React, Solidity

Link to the project

Sample Code

import React, { useState } from 'react';
import Web3 from 'web3';

const App = () => {
    const [tweet, setTweet] = useState('');

    const submitTweet = async () => {
        const web3 = new Web3(window.ethereum);
        await window.ethereum.request({ method: 'eth_requestAccounts' });
        const accounts = await web3.eth.getAccounts();
        // Call smart contract function to save tweet
    };

    return (
        

             setTweet(e.target.value)} />
            
        

    );
};

export default App;

5. Build Your Own Web3.0 Metaverse

This project teaches users how to create a metaverse similar to Sandbox or Decentraland, linking plots of land to NFTs on the blockchain.

Tech Stack: Solidity, JavaScript, Web3.0

Link to the project

Sample Code

pragma solidity ^0.8.0;

contract Metaverse {
    struct Plot {
        uint256 id;
        address owner;
    }

    mapping(uint256 => Plot) public plots;

    function createPlot(uint256 id) public {
        plots[id] = Plot(id, msg.sender);
    }
 function getPlot(uint256 id) public view returns (address) {
        return plots[id].owner;
    }
}

Conclusion

These projects showcase the versatility of Web3.js in building decentralized applications across various domains. By exploring these examples, you can gain insights into how to leverage Web3.js for your own projects and contribute to the growing ecosystem of decentralized applications.