This is the database link
const firebase = "https://booktakeaway-dd150-default-rtdb.europe-west1.firebasedatabase.app"
And this the function that i use to delete the file, but i doesn't work. I can't find anything online.
return async dispatch => {
try {
const response = await firebase.get(`booksData.json?auth=${token}`);
const firebaseData= response.data;
for (let key in dataFirebase) {
if (id === firebaseData[key].bookId) {
await firebase.ref(`/booksData/${key}`).remove();
console.log("Done");
}
}
await dispatch(getSavedBooksIDs());
} catch (error) {
console.log(error);
}
};

You can try to set it to null, worked for me:
return async dispatch => {
try {
const response = await firebase.get(`booksData.json?auth=${token}`);
const firebaseData= response.data;
for (let key in firebaseData) {
if (id === firebaseData[key].bookId) {
await firebase.ref(`booksData/${key}`).set(null);
console.log("Done");
}
}
await dispatch(getSavedBooksIDs());
} catch (error) {
console.log(error);
}
};