30 seconds of code

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

Use Object.keys() and Array.prototype.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;
  }, {});