ebazhanov / dapp-university-js-for-blockchain Goto Github PK

This example will open your eyes on the topic of how to BECOME A HIGHLY PAID BLOCKCHAIN DEVELOPER

Youtube: "Javascript for Blockchain"

• 02:39:57 Web3.js #1
• 03:00:22 Web3.js #2
• 03:20:13 Web3.js #3
• 03:32:45 Web3.js #4
• 03:54:09 Web3.js #5
• 04:16:20 Web3.js #6
• 04:34:47 Web3.js #7
• 04:49:22 Web3.js #8

Code: https://github.com/dappuniversity/web...

• https://web3js.readthedocs.io/en/v1.2.1/
• https://github.com/ethereum/web3.js
• http://iotbl.blogspot.com/2017/03/ethereum-and-blockchain-2.html
• https://en.wikipedia.org/wiki/JSON-RPC
• https://infura.io/

• Check node $ node -v and web3 version $ npm ls web3
• Initialize the project $ npm init
• Install modules $ npm install
• Install web3 $ npm install web3
• If you are getting an " web3 module not found" or similar error,

  try running $ npm install --production windows-build-tools, then $ npm install web3, and finally, $ npm audit fix

$ node

var Web3 = require('web3') undefined var web3 = new Web3('https://mainnet.infura.io/v3/ea9dd948eceb46c888515813a41924ce') web3

// copy ABI from any coin on etherscan.io // e.g. from https://etherscan.io/address/0xd26114cd6EE289AccF82350c8d8487fedB8A0C07#code

var abi = //paste ABI here ⚠️

// copy contract`s address

var contractAddress = '0xd26114cd6EE289AccF82350c8d8487fedB8A0C07' contractAddress var contract = new web3/eth.contract(abi, contractAddress) contract

contract.methods.name().call((err, result) => {console.log(result) }) contract.methods.symbol().call((err, result) => {console.log(result) }) contract.methods.totalSupply().call((err, result) => {console.log(result) }) contract.methods.mintingFinished().call((err, result) => {console.log(result) })

// find an address of token holder from etherscan.io

var accountAddress ='0xd26114cd6EE289AccF82350c8d8487fedB8A0C07' contract.methods.balanceOf(accountAddress).call((err, result) => {console.log(result) })

ropsten.infura.io/v3/ea9dd948eceb46c888515813a41924ce npm install ethereumjs-tx node app.js