Function to convert camel case hash to snake case

toSnakeCase.js

const keyToSnake = word => word.replace(
  /[A-Z]+/,
  match => `_${match.toLowerCase().split('').join('_')}`,
);

const toSnakeCase = (obj) => {
  const entries = Object.entries(obj).map(
    entry => [keyToSnake(entry[0]), entry[1]],
  );

  return Object.fromEntries(entries);
};