Quick question

Do fetch() read from local file instead of url?

.then ............

this is my localJson.json file

 "id": 1,
 "title": "Mrs",
 "body": "Case",
"date": "3/13/2017"
   "id": 2,
   "title": "Ms",
   "body": "Blackater",
   "date": "5/8/2017"

No, fetch is meant to be used with remote resources.

If you want to read bundled files, look into using FuseJS/Bundle. If you want to read files stored in app data directory, use FuseJS/FileSystem.