How do I insert a variable in my json payload?

Question

I am using the firebase realtime database to get data into my app. I am using json to sort my data and I try to get a variable as my value as shown in the code. I tried to use JSON.stringify(favoriteMenu) and "{favoriteMenu}" but that does not work. Does somebody has an idea? Thank you.

var favoriteMenu = "Pizza";
{
   "Menu" : {
     "09:09:2020" : {
       "Menu1" : favoriteMenu
     }
   }
}

I am new in json but the following is what I sued to get the results from the added image. But when I tried it with a variable it gives me an error when I want to import the json file to the realtime database from firebase.

{
  "Menu" : {
    "09:09:2020" : {
      "Menu1" : "Coconut Fish Curry"
    }
  }
}

Answer 1

If your question is how to set the key Menu1 of the object at key 09:09:2020 which is inside object at key Menu to the value of the variable named favoriteMenu then:

var favoriteMenu = "Pizza";

var o = {
   "Menu" : {
     "09:09:2020" : {
       "Menu1" : favoriteMenu
     }
   }
};

o.Menu["09:09:2020"].Menu1 = favoriteMenu;

console.log(o.Menu["09:09:2020"].Menu1 === favoriteMenu);

Most likely you were confused about how to index object with keys like 09:09:2020, as you can see it is possible by using square brackets and wrapping key as a string.