Blockchain technology is changing how we store, share, and secure data. For Angular developers, learning blockchain concepts can help build exciting decentralized applications (dApps). In this blog, we’ll cover the basics of blockchain and show how Angular can be used to create simple dApps with practical examples.
Blockchain is a shared digital record that anyone can view but cannot change. It stores data in chunks called “blocks,” which are linked in a chain. Each block has:
🔹Data: The information, like transaction details.
🔹Hash: A unique code for the block.
🔹Previous Hash: The code of the last block, connecting the chain.
Related read: Getting Started With Blockchain Development: The Complete Guide
dApps use blockchain to let people interact directly without middlemen, like banks or companies. Their key features include:
🔹Smart Contracts: Programs on the blockchain that run automatically.
🔹Tokens: Digital money or assets for transactions.
🔹Interoperability: Work across different blockchains or systems.
Angular is a framework for building great web apps. Here’s why it’s perfect for dApps:
🔹Organized Code: Makes large apps easier to manage.
🔹Reactive Data Handling: Tools like RxJS make data updates quick and smooth.
🔹Live Updates: Keeps the app’s data and display in sync.
🔹Large Community: Lots of resources and help available.
Combining Angular and blockchain lets you build powerful and interactive dApps.
Here’s what you need to set up a basic dApp:
Run these commands to start:
ng new blockchain-dapp cd blockchain-dapp
Add the Web3.js library:
npm install web3
Create a service to handle blockchain tasks. Add a file called blockchain.service.ts:
import { Injectable } from '@angular/core';
import Web3 from 'web3';
@Injectable({
providedIn: 'root',
})
export class BlockchainService {
private web3: Web3;
constructor() {
this.web3 = new Web3('http://127.0.0.1:7545'); // Connect to local blockchain (hardhat)
}
async getAccounts(): Promise<string[]> {
return await this.web3.eth.getAccounts();
}
async getBalance(account: string): Promise<string> {
return await this.web3.eth.getBalance(account);
}
}Create a new component:
ng generate component blockchain-dashboard
Update blockchain-dashboard.component.ts:
import { Component, OnInit } from '@angular/core';
import { BlockchainService } from '../services/blockchain.service';
@Component({
selector: 'app-blockchain-dashboard',
templateUrl: './blockchain-dashboard.component.html',
styleUrls: ['./blockchain-dashboard.component.css'],
})
export class BlockchainDashboardComponent implements OnInit {
accounts: string[] = [];
balances: { [key: string]: string } = {};
constructor(private blockchainService: BlockchainService) {}
async ngOnInit() {
this.accounts = await this.blockchainService.getAccounts();
for (const account of this.accounts) {
this.balances[account] = await this.blockchainService.getBalance(account);
}
}
}Update blockchain-dashboard.component.html to display data:
<div class="dashboard">
<h2>Blockchain Dashboard</h2>
<ul>
<li *ngFor="let account of accounts">
<p>Account: {{ account }}</p>
<p>Balance: {{ balances[account] }}</p>
</li>
</ul>
</div>Write a basic smart contract in Solidity:
pragma solidity ^0.8.0;
contract SimpleStorage {
uint256 private data;
function set(uint256 value) public {
data = value;
}
function get() public view returns (uint256) {
return data;
}
}Deploy it using Hardhat, then update the service to interact with the contract:
async setContractData(value: number): Promise<void> {
await this.contract.methods.set(value).send({ from: this.accounts[0] });
}
async getContractData(): Promise<number> {
return await this.contract.methods.get().call();
}Run the Angular app:
ng serve
Check out your blockchain data on the dashboard and interact with your smart contract.
Blockchain and Angular offer a powerful combination for developing secure, scalable, and decentralized applications. By utilizing Angular’s robust framework and blockchain’s trustless architecture, developers can create innovative dApps that redefine digital interactions. Whether you’re experimenting with smart contracts, building wallet integrations, or designing decentralized user experiences, now is the perfect time to explore this technology. Start small, refine your skills, and be part of the future of decentralized applications!
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