30-seconds-of-code/snippets/lowercaseKeys.md

lowercaseKeys

Creates a new object from the specified object, where all the keys are in lowercase.

Use Object.keys() and Array.reduce() to create a new object from the specified object. Convert each key in the original object to lowercase, using String.toLowerCase().

const lowercaseKeys = obj =>
  Object.keys(obj).reduce((acc,key) => {acc[key.toLowerCase()] = obj[key]; return acc;},{});

const myObj = {Name: 'Adam', sUrnAME: 'Smith'};
const myObjLower = lowercaseKeys(myObj); // {name: 'Adam', surname: 'Smith'};