huynhsamha/simple-node-ethereum

Smart contract, Ropsten Test Network Ethereum, MetaMask, Infura, Web3, Truffle.

Simple NodeJS Ethereum

Smart contract, Ropsten Test Network Ethereum, MetaMask, Infura, Web3, Truffle.

If you're interested in Golang connecting to Ethereum, please reference my simple-go-ethereum here: https://github.com/huynhsamha/simple-go-ethereum

Step by step

Create accounts and deposit ether with MetaMask

• Install extension MetaMask in Chrome browser.
• Choose Ropsten Test Network.
• Create accounts and deposit Ether from Test Faucet
• Get private keys from accounts (MetaMask requires your password)

Create account with Infura

Create account on https://infura.io

Quickstart

• Clone repository, installing packages with npm or yarn
• Copy file .env.example to file .env with the same path.
• Change variables in new file .env with your values.

Compile solidity code with truffle

truffle compile

Solidity files in contracts/*.sol will be compiled to build/contracts/*.json

Document for Web3js

• Manage accounts and wallet:
  • Private Key to Account: https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#privatekeytoaccount
  • Add account to wallet: https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#wallet-add
  • Remove account from wallet: https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#wallet-remove
• Deploy smart contract: https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#deploy
• Use methods in Contract:
  • Call: https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#methods-mymethod-call
  • Send: https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#methods-mymethod-send
• Some utils:
  • toHex: https://web3js.readthedocs.io/en/1.0/web3-utils.html#tohex
  • toWei: https://web3js.readthedocs.io/en/1.0/web3-utils.html#towei
  • hexToBytes: https://web3js.readthedocs.io/en/1.0/web3-utils.html#hextobytes