[javascript] How to convert an Object {} to an Array [] of key-value pairs in JavaScript

The best way is to do:

var obj ={"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10"??:0,"11":0,"12":0} 
Object.entries(obj);

Calling entries, as shown here, will return [key, value] pairs, as the asker requested.

Alternatively, you could call Object.values(obj), which would return only values.

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