Return to Answer

Local storage only supports string datatype. So you have to

1. Convert it to String before saving to LocalStorage

    localStorage.setItem('key', JSON.stringify(data));
   

2. Convert back to JS object, reading from LocalStorage

    data = JSON.parse(localStorage.getItem('key');
   

In case of your code, it should be -

var widgets = JSON.parse(localStorage.getItem('widgets'));

and

localStorage.setItem('widgets', JSON.stringify(widgets));

Local storage only supports string datatype. So you have to

1. Convert it to String before saving to LocalStorage

    localStorage.setItem('key', JSON.stringify(data));
   

2. Convert back to JS object, reading from LocalStorage

    data = JSON.parse(localStorage.getItem('key')); //forgot to close
   

In case of your code, it should be -

var widgets = JSON.parse(localStorage.getItem('widgets'));

and

localStorage.setItem('widgets', JSON.stringify(widgets));