Here’s an example of how I string together the keywords from an JSon array:
Keywords = Data.keywords_and_keyphrases
KeywordString = 'Keywords: ’
for (let i = 0; i < Keywords.length; i++) {
Keyword = Keywords[i]
KeywordString = KeywordString + Keyword + ', ’
}
As you can see they’re separated by a comma + ‘, ’ which could equally be +’: ’

In your example you could just do:

myArray.join(“, “);

You can pass any string to the join method as a delimiter. See Array Join method documentation

Well, you have to use the join method to do what you are looking for.

let myArray = ["apple", "banana", "cherry", "date"];
let delimiter = ", "; // You can change this to your desired delimiter

let result = myArray.join(delimiter);

console.log(result);

Thanks