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web3

Ethereum JavaScript API

  • 4.8.1-dev.88b7e2e.0
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
516K
increased by14.78%
Maintainers
4
Weekly downloads
 
Created

What is web3?

The web3 npm package is a collection of libraries that allow you to interact with a local or remote Ethereum node, using HTTP, IPC, or WebSocket. It provides functionalities for interacting with smart contracts, sending transactions, and querying blockchain data.

What are web3's main functionalities?

Connecting to an Ethereum Node

This feature allows you to connect to an Ethereum node using an HTTP provider. You can replace the URL with your own node's URL or use a service like Infura.

const Web3 = require('web3');
const web3 = new Web3('https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID');

Interacting with Smart Contracts

This feature allows you to interact with smart contracts deployed on the Ethereum blockchain. You need the contract's ABI and address to create a contract instance and call its methods.

const contractABI = [/* ABI array */];
const contractAddress = '0xYourContractAddress';
const contract = new web3.eth.Contract(contractABI, contractAddress);
contract.methods.yourMethod().call().then(console.log);

Sending Transactions

This feature allows you to send transactions on the Ethereum network. You need the sender's account address and private key to sign and send the transaction.

const account = '0xYourAccountAddress';
const privateKey = 'your_private_key';
const tx = {
  to: '0xRecipientAddress',
  value: web3.utils.toWei('0.1', 'ether'),
  gas: 2000000
};
web3.eth.accounts.signTransaction(tx, privateKey).then(signed => {
  web3.eth.sendSignedTransaction(signed.rawTransaction)
    .on('receipt', console.log);
});

Querying Blockchain Data

This feature allows you to query data from the blockchain, such as retrieving the latest block information.

web3.eth.getBlock('latest').then(console.log);

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Package last updated on 02 May 2024

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