EtherElect ĐApp

A decentralized voting website that keeps track of the votes to each candidate using an Ethereum smart contract.

Screenshot of the website in action

Prerequisites

• Node.js, a JavaScript runtime
• npm, a package manager for JavaScript
• solc, a Solidity compiler
• web3.js, an Ethereum Javascript API
• Ganache, a personal blockchain for Ethereum development

Installing

Node.js and npm

Go to https://nodejs.org/en/ to download the package or use Homebrew to install

brew install node

Check whether node and npm installed correctly using

node -v
npm -v

solc

npm install solc

web3.js

npm install web3@0.20.6

Ganache CLI

npm install ganache-cli

Note: npm installs to the current directory in the terminal

Running the app

Open a terminal window and locate to the current directory and start Ganache to implement a personal blockchain

node_modules/.bin/ganache-cli

Open another terminal window and open the node console using

node

Compile the Solidity file voting.sol in the node console using

> code = fs.readFileSync('voting.sol').toString()
> solc = require('solc')
> compiledCode = solc.compile(code)

Deploy the contract in the node console using

> byteCode = compiledCode.contracts[':Voting'].bytecode;
> deployedContract = votingContract.new(['Kim Jong-un','Donald Trump','Vladimir Putin'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000});

If changes have been made in the voting.sol file, update abi = JSON.parse() in index.js file with > compiledCode.contracts[':Voting'].interface

abi = JSON.parse(compiledCode.contracts[':Voting'].interface)

The address of votingContract.at(address) will change with every ganache-cli restart and should be replaced with > deployedContract.address

contractInstance = votingContract.at('0x3b08aa4681a7b4757287d9e7afef9fecbf51f782');

Note: > code refers to code that needs to be run in the node console

Authors

• Rajat Dipta Biswas - Initial work

See also the list of contributors who participated in this project.

Acknowledgements

• Zastrin
• FreeCodeCamp - A guide to developing an Ethereum decentralized voting application