@gussie.jones 
В JavaScript есть несколько способов преобразовать массив в строку.
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var fruits = ["apple", "banana", "mango"]; console.log(fruits.join()); // "apple,banana,mango" console.log(fruits.join(" ")); // "apple banana mango" console.log(fruits.join("-")); // "apple-banana-mango"  | 
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var fruits = ["apple", "banana", "mango"]; console.log(fruits + ""); // "apple,banana,mango"  | 
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var fruits = ["apple", "banana", "mango"]; console.log(fruits.toString()); // "apple,banana,mango"  | 
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var fruits = ["apple", "banana", "mango"]; console.log(JSON  |