Tony_Gabrial,
<script>
let obj = {"data": {
"Contract": {
"19654668": {
"DateIns": "2019-11-20",
"Amount": 53999,
"Dogovor": "54985115555",
"ProgramName": "Стол"
},
"14898668": {
"DateIns": "2020-10-05",
"Amount": 7345,
"Dogovor": "5498511553333",
"ProgramName": "Кресло"
},
"19652368": {
"DateIns": "2020-10-05",
"Amount": 9555,
"Dogovor": "549851155553232",
"ProgramName": "Стол"
},
"7774668": {
"DateIns": "2020-10-25",
"Amount": 9555,
"Dogovor": "549851155551232",
"ProgramName": "Стол и кресло"
}
},
"ref": "200822329841A8C7",
"date_creat": "2020-08-26",
}};
let date_creat = obj.data.date_creat;
for(let item of Object.values(obj.data.Contract)) {
let attracted = "K";
if(["Стол", "Кресло"].includes(item.ProgramName)) {
attracted = item.DateIns >= date_creat ? "Y" : "N"
}
item.attracted = attracted;
}
document.write(`<pre>${JSON.stringify(obj, "", 4)}</pre>`)
</script>