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# Web3.js

The original and most widely used Ethereum JavaScript API.

import Web3 from 'web3';
const web3 = new Web3('YOUR_ETHEREUM_NODE_URL');

// Get balance
const getBalance = async (address) => {
	const balance = await web3.eth.getBalance(address);
	const balanceInEth = web3.utils.fromWei(balance, 'ether');
	return balanceInEth;
};

// Send transaction
const sendTransaction = async (from, to, value) => {
	const tx = {
		from,
		to,
		value: web3.utils.toWei(value, 'ether'),
	};
	return await web3.eth.sendTransaction(tx);
};

GitHub: web3.js
Documentation: web3js.readthedocs.io
Features:
- Complete Ethereum API coverage
- Extensive community support
- WebSocket support
- Contract interactions
- ENS support

# Ethers.js

Modern, complete and compact library.

import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider('YOUR_ETHEREUM_NODE_URL');

// Get balance
const getBalance = async (address) => {
	const balance = await provider.getBalance(address);
	return ethers.formatEther(balance);
};

// Send transaction
const sendTransaction = async (wallet, to, value) => {
	const tx = await wallet.sendTransaction({
		to,
		value: ethers.parseEther(value),
	});
	return await tx.wait();
};

GitHub: ethers.js
Documentation: docs.ethers.org
Features:
- TypeScript support
- Smaller bundle size
- Better security features
- ENS support
- Extensive testing

# TypeScript Support

Both libraries provide excellent TypeScript support. When using TypeScript, you get:

Type definitions out of the box
Better IDE support
Compile-time error checking
Enhanced code documentation

import { BigNumber } from 'ethers';

interface TransactionData {
	to: string;
	value: BigNumber;
	gasLimit?: BigNumber;
}

const createTransaction = async (data: TransactionData) => {
	// Your implementation
};

# Node.js Usage

Both libraries work seamlessly in Node.js environments:

// Web3.js in Node.js
const Web3 = require('web3');
const web3 = new Web3('YOUR_ETHEREUM_NODE_URL');

// Ethers.js in Node.js
const { ethers } = require('ethers');
const provider = new ethers.JsonRpcProvider('YOUR_ETHEREUM_NODE_URL');

# Browser Usage

For browser environments, you can use either library with bundlers like webpack or vite:

// Using ES modules
import { Web3 } from 'web3';
// or
import { ethers } from 'ethers';

// Using window.ethereum (MetaMask)
const provider = new ethers.BrowserProvider(window.ethereum);

JavaScript/TypeScript Tools

# Web3.js

# Ethers.js

# TypeScript Support

# Node.js Usage

# Browser Usage

See also