creating two different sha256 hashes

sha256.js

var crypto = require("crypto");

var hash1 = crypto.createHash("sha256");
hash1.update("topsecret", "utf8");
console.log(hash1.digest("base64"));  // UzNqZ2xkwTllU7K3yS84EmdognyTtk2RQgacEO2npyE=

var hash2 = crypto.createHash("sha256");
hash2.update("topSecret", "utf8");
console.log(hash2.digest("base64"));  // mFuUzsUvYbRLt21+34+fwP6IpapAhqBLsbycLnGfQIc=