JSON API: Camelize keys in the client (JavaScript) - functional style

index.js

// Converts 'foo-bar' to 'fooBar'
// Credits: https://stackoverflow.com/a/6661012
export function camelize(str) {
  return str.replace(/-([a-z])/g, g => g[1].toUpperCase());
}


function camelizeKeys(obj) {
  return Object.assign(...Object.entries(obj).map(
    ([key, val]) => ({ [camelize(key)]: val })
  ));
}


export function camelizeAttributes(response) {
  const { data } = response.data;

  if (!data) return response;

  return {
    ...response,
    data: {
      ...response.data,
      data: Array.isArray(data)
        ? data.map(item => ({ ...item, attributes: camelizeKeys(item.attributes) }))
        : { ...data, attributes: camelizeKeys(data.attributes) },
    },
  };
}