why JSON.stringify returning [] for array in javascript

Given an Array with some string characters as key but if I print the array showing [] as below

var array = [];
array['name'] = 'James';
array['age'] =25;
console.log(JSON.stringify(array));

output

[]

Arrays does not use string as element index, it can use only Integers as Index
If we want to use String as element Index, we can use Object instead of Array
Object accepts String as key
To initialize Object we use var array1={};

var array1 = {};
array1['name'] = 'James';
array1['age'] = 25;
console.log(JSON.stringify(array1));

output

{"name":"James","age":25}