parse-json-object-as-map/lib/index.js

JSON.parse but returns Map instead of Object

'use strict';

const object2map = object => new Map(Object.keys(object).map(key => [key, object[key]]));

/**
 * The method parses a string as JSON, optionally transforming the value produced by parsing.
 * Unlike JSON.parse(), this returns Map instead of basic Object.
 *
 * @param  {string}   text      The string to parse as JSON
 * @param  {function} [reviver] If a function, prescribes how the value originally produced by parsing is transformed, before being returned
 * @return {*}
 * @throws SyntaxError
 */
module.exports = function(text, reviver) {
  return JSON.parse(
    text,
    reviver !== undefined
      ? (key, value) => {
          if (typeof value === 'object' && !Array.isArray(value)) {
            value = object2map(value);
          }

          return reviver(key, value);
        }
      : (key, value) => {
          if (typeof value === 'object' && !Array.isArray(value)) {
            return object2map(value);
          }

          return value;
        }
  );
};

module.exports.default = module.exports;