Serial number store key value pair javascript

I am learning react. I am trying to figure out how to use .maps.
So my scenerio is this. I am getting a nested Object from a MySql database. It is an Object because it is an Assoc Array which Javascript sees as an Object. As far as I can tell this is a given and nothing I can do about it.
The Object looks like this:

{ AA:[1,2,3,4], BB:[2,3,4,5], GD:[8,5,3,5. ... } 

I want to make this into an Array so I can do neat things like finding out the length and accessing it. But I can not for the life of me figure out how to turn this into an array. I have been searching online for the last 5 hours and coming up with lots of maps examples that show how to do things like output it to the screen when you know the key value pairs and things like that but nothing explaining how to take a multidimensional object and turn it into a multidimensional array.
And I know that coming up in this project is another array three deep and I will need to know how to make that an array as well that I can store in useState.

{ AA:{ 342:{ ID: 34 Name: Bob } ... } 

Can anyone explain in step by step "This is what this thing does" language how this is done while assuming I don't know much about JavaScript or react? I would be very grateful.

Hi there,
I want to start to collect postings to C_Programming under various topics related to (you guessed it) C programming. You can, of course, help me get more postings and more topics. Some time in the future we can make this an entry to the wiki.

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