Web3 .js Ethereum Javascript API

web3.js is a collection of libraries which allow you to interact with a local or remote ethereum node, using a HTTP or IPC connection. The web3 JavaScript library interacts with the Ethereum blockchain. It can retrieve user accounts, send transactions, interact with smart contracts, and more.

Version : 1.0.0-beta.36

Web3.js API Type

• eth: Etherum blockchain related methods
• net: Node’s network status
• personal: Account functions and sending
• db: Get/put for local LevelDB
• shh: P2P messaging using Whisper

Install Web3.js

Node

npm install web3

CDN : https://cdn.jsdelivr.net/gh/ethereum/web3.js@1.0.0-beta.34/dist/

<script src="https://cdn.jsdelivr.net/gh/ethereum/web3.js@1.0.0-beta.34/dist/web3.js">
<script src="https://cdn.jsdelivr.net/gh/ethereum/web3.js@1.0.0-beta.34/dist/web3.min.js">

Instantiating web3

// Modern dapp browsers...
if (window.ethereum) {
  App.web3Provider = window.ethereum;
  try {
    // Request account access
    await window.ethereum.enable();
  } catch (error) {
    //…