Simple demonstration to query deployed ethereum contracts quickly using web3.

This could have been done without truffle but using truffle makes life easier.

Pre-requisites

• Install truffle

• Signed up with [infura.io] and have the api keys.

Installation

• clone this repo

• cd repo, npm install

• cp .env.sample .env and update values

• If you want to make queries that require ether, you will need to create an ethereum account from a HD wallet. metamask could be a quick an easy option. Install metamask and get the mnemonic key. Then update .env with the key.

Execution

In query.js

• Update contract_address.

• update abi. abi can be copied directly from the contract source in etherscan.io

• Update query logic function

Once ready, truffle exec query.js --network main