Metamask: How to sign transaction using web3.js via metamask

Signature of transactions with web3.js via metamask: a step by step guide

As developers who build blockchain -based applications, you probably know the concept of interaction with blockchain. However, the execution of program transactions from your web application can be difficult. In this article, we will guide you through the transaction signature process using web3.JS and inject metamasque functionalities into your browser to facilitate the execution of secure transactions.

Prerequisite

Before treatment, make sure:

• You have a basic understanding of JavaScript, HTML and CSS.

• You installed Node.js and NPM (the package manager for Node.JS) on your system.

• You have a project based on the configured blockchain, including an implementation of contract and a backend server.

Step 1: Configure Metamask

Metamask is a browser extension that allows users to manage their digital assets, including private keys and wallet addresses. To use Metamask with web3.js, you will have to:

• Install the Metamask browser extension.

• Create an account on Metamask by providing your email address and creating a password.

• Activate the web3 extension in your browser settings.

Step 2: Configure Web3.js

Web3.js is a popular JavaScript library to interact with the Ethereum blockchain. To use it, you will have to:

• Install Node.js and NPM (as mentioned earlier).

• Create a new Node.js project using “NPM INIT”.

• Initial your project by performing npm install web3 'in your terminal.

• Import Web3.JS in your application:Const web3 = require (‘web3’).

• Create a new file calledindex.htmland add the following code:

Html