Is it bad to add JSON on HTML data attribute?

Question

Since HTML data attribute allows adding any custom data, I wonder if it is a good idea to include a set of JSON list as a data attribute?

Answer 1

You could make use of Map. Where your element will be the key, and the value at that key could be an object in which you store wanted data. Something like this (not tested though):

(function(global) {

  const map = new Map();

  global.CustomData = {
    add(element, key, data) {
      if (!map.has(element)) {
        map.set(element, {});
      }

      map.get(element)[key] = data;

      return map.get(element);
    },

    get(element, key) {
      if (!map.has(element)) {
        return null;
      }

      if (key !== undefined) {
        return map.get(element)[key];
      }

      return map.get(element)
    },

    remove(element, key) {
      if (!map.has(element)) {
        return false;
      }

      delete map.get(element)[key];

      if (Object.keys(map.get(element)).length === 0) {
        map.delete(element);
      }

      return true;
    },

    clear(element) {

      if (!map.has(element)) {
        return false;
      }

      map.delete(element);

      return true;
    }
  }

})(window);