Object Signatures

README.md

Summary

For creating signatures of objects / class instances.

Takes Object, returns String

• Sample use case?
  • Memoization, for caching results of expensive functions.
  • This function generates a key that you can use for caching.
• Why CircularJSON instead of JSON.stringify?
  • To keep us error-free on objects with circular references.
• Why sha256?
  • It's better than md5 / sha1 (that's what she says)

ObjectSignature.js

const hasha = require('hasha');
const CircularJSON = require('circular-json');
let signature = hasha(
  CircularJSON.stringify(query),
  { algorithm: 'sha256' }
);