const titi = "TITI";
const body = {"toto":"TOTO",titi,"_id":"23"}
delete body._id;
const thing = {...body};
console.log(thing)
PS C:\Users\denis.dupont\OneDrive - Universite Evry Val d'Essonne\Bureau\testgenerateur> node .\test.js
{ toto: 'TOTO', titi: 'TITI' }