ethers.js
This versatile Ethereum library, developed in TypeScript, provides secure management of private keys, JSON wallets, and BIP 39 mnemonic phrases. It supports HD Wallets and human-readable ABIs and allows for seamless connection to Ethereum nodes via JSON-RPC, INFURA, Etherscan, MetaMask, and more. Designed with efficiency in mind, it offers minimal size and tree-shaking support. The library includes extensive documentation and testing, and is open-source under the MIT License. It facilitates Ethereum development with built-in API keys and offers extensions for multicoin and Optimism utilities.