こんにちは！友好的な注意点：このページは、 Javascript/Typescript リクエストの操作に関する確かな概要を提供することを目的としています。実践的なコード例については、 API Methods documentation をチェックしてください。そこにはすべてのサポートされている言語ですぐに使用できる例があります！

# 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