[{"products":["soccer ball","spiral notebook","gel pen","water bottle","backpack"]},{"products":["basketball","composition notebook","fountain pen","duffle bag","sports shoes"]},{"products":["tennis ball","journal","mechanical pencil","hand towel","headband"]},{"products":["volleyball","sketchbook","marker","knee pads","drawstring bag"]},{"products":["golf ball","planner","erasable pen","glove","visor"]}]

db.collection.aggregate([{"$unwind":{"path":"$products","preserveNullAndEmptyArrays":true}}])