parseJsonApi.js

import { camelCase, mapKeys } from 'lodash';

function camelizeKeys(object) {
  return mapKeys(object, (value, key) => camelCase(key));
}

export default function parseJsonApi(response, type) {
  return (response.included || [])
    .concat(Array.isArray(response.data) ? response.data : [response.data])
    .filter((item) => item.type === type)
    .reduce((previousValue, currentValue) => {
      const value = { ...previousValue };

      value[currentValue.id] = {
        id: currentValue.id,
        ...camelizeKeys(currentValue.attributes),
      };

      if (currentValue.relationships) {
        const relationships = camelizeKeys(currentValue.relationships);
        Object.keys(relationships).forEach((key) => {
          const relationship = relationships[key].data;
          if (relationship) {
            if (Array.isArray(relationship)) {
              value[currentValue.id][key] = relationship.map((item) => item.id);
            } else {
              value[currentValue.id][key] = relationship.id;
            }
          }
        });
      }

      return value;
    }, {});
}