Querying Rospten with NodeJS

rospten-nodejs.md

Querying Rospten with NodeJS

1. Create a new work directory: mkdir rospten-nodejs
2. Use that directory: cd rospten-nodejs
3. Install web3 library: npm install web3
4. Save the following code to get-balance.js:

let infuraKey = "INFURA API KEY";
let metamaskWallet = "METAMASK WALLET";

let Web3 = require("web3");
let web3 = new Web3(new Web3.providers.HttpProvider("https://ropsten.infura.io/" + infuraKey));
web3.eth.getBalance(metamaskWallet).then(balance => console.log(balance));

5. Replace the first two variables with your actual infura API key and metamask wallet.
6. Execute the query: node ./get-balance.js
7. This returns an integer with the number of wei, which is 10^-18 ether, so 10000000000000000 is 0.01 ETH.