Signing Transactions with Web3.js via Metamask: A Step-BY-Step guide
Ass a Developer Building Blockchain-Based Applications, You’re Likely Familiar With The Concept with the Blockchain. However, Executing Transctions Programmatically Force Visits on Your Web Application Can Be Challening. In this article, We’ll walk you’re processes off transactions web3.js and injecting metamask function into your browser to facilitation secuure execution.
Prerequisites
Before Processing, Ensure That:
- You have a basic understanding off JavaScript, HTML, and CSS.
- You have been installed node.js and NPM (The Package Manager for Node.js) is on your System.
- You have a blockchain-based project set up, including a contraction and a backend server.
Step 1: Set Up Metamask
Methods is a browser extension that allows users to manage are digitalasses, including at the private key and wrets. To use metamask with web3.js, you’ll need to:
- Install the metamask browser extension.
- Create an account on the metmask by providing your enmailed accommodation and cringing a password.
- Enable the web3 extension in your browser settings.
Step 2: Set Up Web3.js
Web3.js is a popular javascript library fort in interacting with ethereum blockchain. To use it, you’ll need to:
- Install node.js and npm (as a mentioned earlier).
- Create a new node.js project
npm in '.
- Internalize your project by rowNPM Install Web3
in your terminal.
- Import web3.js in your application:const web3 = require (‘web3’)
.
Step 3: Inject Metamask Functionality Into Your Browser
To: To: You'll Need to:
- Create a new file calledindex.html and advertisement code:
`HTML
body {
Font-Family: Arial, Sans-Serif;
}
Sign Transaction Using Metamask with Web3.js
<script src = "
In this code, we’re web3.js
Step 4: Create a script.js file
Create a new file called
Javascript
Const Web3 = Require (‘Web3’);
Const Web3 = New Web3 (Window.etherum);
Document.geteelementbys (‘Web3’). Add Valid List (‘input’, (e) => {{
constantly private = e.target.value;
web3.eth accounts.add (private) .Then ((account) => {{{{{pe
Document.geteelementbys (‘transaction response’). Innerhtml = transaction signed with account: $ {account.address};
});
});
Document.getelets (‘sign-transaction’). Add Valid List (‘click’, async () => {{
Try
Const signature = Await web3.eth.signing transaction ({
From: ‘0x … Your_account_addresss …’,
Data: ”, // Data to Sign (E.G., Txhash, Contract Methods)
GAPPRICE: 20, // Gas Price for the Transaction
});
Concant transaction response = Await web3.eth.end signed transaction (signature.rawtransction);
Document.geteelementbys (‘transaction response’). Innerhtml = transaction signed and cent to blockchain!;
} Catch (Error) {
console.error (arror);
}
});
`
In this Code, we’re using web3.js to crate a new ethereum account surplus the user’s private key.