Dataframe write to JSON as single object - json

Question

I have a dataframe that I am trying to write out to an S3 location as a JSON.
df.printSchema
root
|-- userId: string (nullable = false)
|-- firstName: string (nullable = false)
|-- address: string (nullable = true)
|-- Email: array (nullable = true)
| |-- element: string (containsNull = true)
|-- UserFoodFavourites: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- foodName: string (nullable = true)
| | |-- isFavFood: boolean (nullable = false)
|-- UserGameFavourites: array (nullable = true)
| |-- element: array (containsNull = true)
| | |-- element: struct (containsNull = true)
| | | |-- Department: string (nullable = false)
| | | |-- gameName: string (nullable = false)
Writing out dataframe to JSON:
df.repartition(1).write.option("mode","append").json("s3Location")
JSON output I get:
{"userId":111,"firstName":"first123","address":"xyz",
"Email":["def#gmail.com","abc#gmail.com"],
"UserFoodFavourites":[{"foodName":"food1","isFavFood":true},{"foodName":"food2","isFavFood":false}],
"UserGameFavourites":[[{"Department":"Outdoor","gameName":"O1"}],[{"Department":"Indoor","gameName":"I1"},{"Department":"Indoor","gameName":"I2"}]]}
{"userId":123,"firstName":"first123","address":"xyz",
"Email":["def#gmail.com","abc#gmail.com"],
"UserFoodFavourites":[{"foodName":"food1","isFavFood":true},{"foodName":"food2","isFavFood":false}],
"UserGameFavourites":[[{"Department":"Outdoor","gameName":"O1"}],[{"Department":"Indoor","gameName":"I1"},{"Department":"Indoor","gameName":"I2"}]]}
alias prettyjson='python -m json.tool'
However this does not work when I try printing this file in a pretty JSON format using prettyJSON on this file because these are written as multiple JSON objects per userId.
I am trying to write this out as a single JSON object with new line separation, so I can run prettyJSON on this file.
Any help is appreciated.