Viewing object returned from realm.object() - react-native

Question

I added data to a realm using
realm.write(() => {
for (const player in players) {
realm.create('Player', {
id: player.id,
firstname: player.firstname,
lastname: player.lastname,
});
}
});
players is a JSON array.
[
{
"id": 9687,
"firstname": "Nyeem",
"lastname": "Young",
},
{
"id": 100,
"firstname": "Jason",
"lastname": "Holder",
}]
I was able to confirm that the data was entered successfully by using
realmPlayers = realm.objects('Player');
console.log(`There are ${realmPlayers.length} players`); // 99
However when I try to get all the players
console.log(realmPlayers)
I get the error
[TypeError: item.toJSON is not a f
unction. (In 'item.toJSON(index.toString(), cache)', 'item.toJSON' is undefined)]
console.log(JSON.stringify(realmPlayers)); gives the same error.
console.log(realmPlayers[0]); returns {}
Trying to use a filter
realm.objects('Player').filtered('lastname = Young');
I get the error
Failed to open the realm 'Player' has no property: 'Young'
If I have items in the database why can't I access it. Ultimately what I want to do is to get all the items in the database and pass the result to a FlatList component in React Native..
How can I get the data and possible visualize it via the command line?