separate arrays into different records about jsonexport HOT 1 CLOSED

It’s doing so because “location” is a simple array.

Also you need to use the fillGaps option if you want the data to repeat for each row.

Loop your data to change it to this to get location to be on its own row:
var contacts = [{
name: 'Robert',
lastname: 'Miller',
family: null,
location: [{id:1231},{id:3214},{id:4214}]
}];

from jsonexport.