form keys from a JSON file

[little geek]

Hey friends

I need your hepl about state machine, I have a file JSON and I have to form keys

example:

{
"PERSONNE":{
"NOM": "Marc",
"PRENOM":"Remy";
}
"ADRESSE":{
"MAIL":"aaa@gmail.com";
"CODEPOSTAL": "11111";
}
}

the keys you get should look like this:

PERSONNE.NOM

PERSONNE.PRENOM

ADRESSE.MAIL

ADRESSE.CODEPOSTAL

I've tried a lot of things, but nothing so far.

thanks for your help

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