How to group an array of objects based on multiple keys in Javascript?

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You could create an accumulator object with a new key for each unique combination of those 3 keys seperated by -. Then based on this new key merge the array using reduce. Use destructuring to separate the keys you need in the PickupTimeSlots to a rest variable. Then use Object.values to get the final array:

const slots=[{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToCustomer","TimeStart":"1970-01-01T06:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToCustomer","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToCustomer","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T05:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":0,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":2,"PostalCodeType":"ShipToCustomer","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":2,"PostalCodeType":"ShipToCustomer","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":3,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":3,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":4,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":4,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":5,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T16:22:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":5,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:23:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":6,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":6,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T06:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":1,"ShippingCarrierId":1,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T05:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":0,"PickupTime":"1970-01-01T11:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":2,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T00:00:00.000Z","TimeEnd":"1970-01-01T15:59:00.000Z","PickupTimeSlot":"PM","DaysToAdd":0,"PickupTime":"1970-01-01T17:00:00.000Z"},{"WarehouseId":2,"ShippingCarrierId":2,"PostalCodeType":"ShipToDS","TimeStart":"1970-01-01T16:00:00.000Z","TimeEnd":"1970-01-01T23:59:00.000Z","PickupTimeSlot":"AM","DaysToAdd":1,"PickupTime":"1970-01-01T11:00:00.000Z"}]

const merged = slots.reduce((r, { WarehouseId, ShippingCarrierId, PostalCodeType,...rest }) => {
  const key = `${WarehouseId}-${ShippingCarrierId}-${PostalCodeType}`;
  r[key] = r[key] || { WarehouseId, ShippingCarrierId, PostalCodeType, PickupTimeSlots: [] };
  r[key]["PickupTimeSlots"].push(rest)
  return r;
}, {})

const timeTable = Object.values(merged)
console.log(timeTable)

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