remove property from nested json array

let input = [{ "name": "1392", "data": [{ "saat2": 46.5, "maah2": "01", "saal2": 1392 }, { "saat2": 114.06, "maah2": "02", "saal2": 1392 }, { "saat2": 134.03, "maah2": "03", "saal2": 1392 }, { "saat2": 137.18, "maah2": "04", "saal2": 1392 }, { "saat2": 170.34, "maah2": "05", "saal2": 1392 }, { "saat2": 179.91, "maah2": "06", "saal2": 1392 }, { "saat2": 192.8, "maah2": "07", "saal2": 1392 }, { "saat2": 189.11, "maah2": "08", "saal2": 1392 }, { "saat2": 191.91, "maah2": "09", "saal2": 1392 }, { "saat2": 225.07, "maah2": "10", "saal2": 1392 }, { "saat2": 200.7, "maah2": "11", "saal2": 1392 }, { "saat2": 209.34, "maah2": "12", "saal2": 1392 }] }, { "name": "1393", "data": [{ "saat2": 130.97, "maah2": "۰۱", "saal2": 1393 }, { "saat2": 185.17, "maah2": "۰۲", "saal2": 1393 }, { "saat2": 92.74, "maah2": "۰۳", "saal2": 1393 }, { "saat2": 112.7, "maah2": "۰۴", "saal2": 1393 }, { "saat2": 96.5, "maah2": "۰۵", "saal2": 1393 }, { "saat2": 91.14, "maah2": "۰۶", "saal2": 1393 }, { "saat2": 65.67, "maah2": "۰۷", "saal2": 1393 }, { "saat2": 71.23, "maah2": "۰۸", "saal2": 1393 }, { "saat2": 104.71, "maah2": "۰۹", "saal2": 1393 }, { "saat2": 105.18, "maah2": "۱۰", "saal2": 1393 }, { "saat2": 93.24, "maah2": "۱۱", "saal2": 1393 }, { "saat2": 98.95, "maah2": "۱۲", "saal2": 1393 }] }, { "name": "1394", "data": [{ "saat2": 86.15, "maah2": "۰۱", "saal2": 1394 }, { "saat2": 47.4, "maah2": "۰۲", "saal2": 1394 }, { "saat2": 41.07, "maah2": "۰۳", "saal2": 1394 }, { "saat2": 51.99, "maah2": "۰۴", "saal2": 1394 }, { "saat2": 71.92, "maah2": "۰۵", "saal2": 1394 }, { "saat2": 682.53, "maah2": "۰۶", "saal2": 1394 }, { "saat2": 50.29, "maah2": "۰۷", "saal2": 1394 }, { "saat2": 87.66, "maah2": "۰۸", "saal2": 1394 }, { "saat2": 49.19, "maah2": "۰۹", "saal2": 1394 }, { "saat2": 60.7, "maah2": "۱۰", "saal2": 1394 }, { "saat2": 69.21, "maah2": "۱۱", "saal2": 1394 }, { "saat2": 54.23, "maah2": "۱۲", "saal2": 1394 }] }, { "name": "1395", "data": [{ "saat2": 42.86, "maah2": "01", "saal2": 1395 }, { "saat2": 99.04, "maah2": "02", "saal2": 1395 }, { "saat2": 51.4, "maah2": "۰۳", "saal2": 1395 }, { "saat2": 29.83, "maah2": "۰۴", "saal2": 1395 }, { "saat2": 68.83, "maah2": "۰۵", "saal2": 1395 }, { "saat2": 68.18, "maah2": "۰۶", "saal2": 1395 }, { "saat2": 65.34, "maah2": "۰۷", "saal2": 1395 }, { "saat2": 61.82, "maah2": "۰۸", "saal2": 1395 }, { "saat2": 82.15, "maah2": "۰۹", "saal2": 1395 }, { "saat2": 129.64, "maah2": "۱۰", "saal2": 1395 }, { "saat2": 116.69, "maah2": "۱۱", "saal2": 1395 }, { "saat2": 117.1, "maah2": "۱۲", "saal2": 1395 }] }, { "name": "1396", "data": [{ "saat2": 70.22, "maah2": "۰۱", "saal2": 1396 }, { "saat2": 109.9, "maah2": "۰۲", "saal2": 1396 }, { "saat2": 82.15, "maah2": "۰۳", "saal2": 1396 }, { "saat2": 55.22, "maah2": "۰۴", "saal2": 1396 }, { "saat2": 108.07, "maah2": "۰۵", "saal2": 1396 }, { "saat2": 98.84, "maah2": "۰۶", "saal2": 1396 }, { "saat2": 104.56, "maah2": "۰۷", "saal2": 1396 }, { "saat2": 84.16, "maah2": "۰۸", "saal2": 1396 }, { "saat2": 71.8, "maah2": "۰۹", "saal2": 1396 }, { "saat2": 123.09, "maah2": "۱۰", "saal2": 1396 }, { "saat2": 110.8, "maah2": "۱۱", "saal2": 1396 }, { "saat2": 162.28, "maah2": "۱۲", "saal2": 1396 }] }, { "name": "1397", "data": [{ "saat2": 59.22, "maah2": "01", "saal2": 1397 }, { "saat2": 63.7, "maah2": "02", "saal2": 1397 }, { "saat2": 70.21, "maah2": "03", "saal2": 1397 }, { "saat2": 103.82, "maah2": "04", "saal2": 1397 }, { "saat2": 113.22, "maah2": "05", "saal2": 1397 }, { "saat2": 108.05, "maah2": "06", "saal2": 1397 }, { "saat2": 114.69, "maah2": "07", "saal2": 1397 }, { "saat2": 56.49, "maah2": "08", "saal2": 1397 }, { "saat2": 97.72, "maah2": "09", "saal2": 1397 }, { "saat2": 54.23, "maah2": "10", "saal2": 1397 }, { "saat2": 22.18, "maah2": "11", "saal2": 1397 }, { "saat2": 58.61, "maah2": "12", "saal2": 1397 }] }, { "name": "1398", "data": [{ "saat2": 15.45, "maah2": "01", "saal2": 1398 }, { "saat2": 38.06, "maah2": "02", "saal2": 1398 }, { "saat2": 27.07, "maah2": "03", "saal2": 1398 }, { "saat2": 0.33, "maah2": "10", "saal2": 1398 }, { "saat2": 6.78, "maah2": "11", "saal2": 1398 }, { "saat2": 8.78, "maah2": "12", "saal2": 1398 }] }, { "name": "1399", "data": [{ "saat2": 63.08, "maah2": "02", "saal2": 1399 }, { "saat2": 29.82, "maah2": "03", "saal2": 1399 }, { "saat2": 61.58, "maah2": "04", "saal2": 1399 }, { "saat2": 36.59, "maah2": "05", "saal2": 1399 }, { "saat2": 33.02, "maah2": "06", "saal2": 1399 }, { "saat2": 58.86, "maah2": "07", "saal2": 1399 }, { "saat2": 59.72, "maah2": "08", "saal2": 1399 }, { "saat2": 33.99, "maah2": "09", "saal2": 1399 }, { "saat2": 59.6, "maah2": "10", "saal2": 1399 }, { "saat2": 70.01, "maah2": "11", "saal2": 1399 }, { "saat2": 81.66, "maah2": "12", "saal2": 1399 }] }, { "name": "1400", "data": [{ "saat2": 132.16, "maah2": "01", "saal2": 1400 }, { "saat2": 61.96, "maah2": "02", "saal2": 1400 }, { "saat2": 71.14, "maah2": "03", "saal2": 1400 }, { "saat2": 54.3, "maah2": "04", "saal2": 1400 }, { "saat2": 52.79, "maah2": "05", "saal2": 1400 }, { "saat2": 37.68, "maah2": "06", "saal2": 1400 }] }]

function removeProperty(obj, propertyToRemove) {
    for(let key of Object.keys(obj)) {
        if (propertyToRemove === key) { 
            delete obj[key];
        } else if (typeof obj[key] === 'object') {
            removeProperty(obj[key], propertyToRemove)
        }
    }
    return obj;
}

removeProperty(input, 'saal2');
console.log('Result:', input);

let data = [{"name": "1392", "data": [{"saat2": 46.5, "maah2": "01", "saal2": 1392 }, {"saat2": 114.06, "maah2": "02", "saal2": 1392 }, {"saat2": 134.03, "maah2": "03", "saal2": 1392 }, {"saat2": 137.18, "maah2": "04", "saal2": 1392 }, {"saat2": 170.34, "maah2": "05", "saal2": 1392 }, {"saat2": 179.91, "maah2": "06", "saal2": 1392 }, {"saat2": 192.8, "maah2": "07", "saal2": 1392 }, {"saat2": 189.11, "maah2": "08", "saal2": 1392 }, {"saat2": 191.91, "maah2": "09", "saal2": 1392 }, {"saat2": 225.07, "maah2": "10", "saal2": 1392 }, {"saat2": 200.7, "maah2": "11", "saal2": 1392 }, {"saat2": 209.34, "maah2": "12", "saal2": 1392 }] }, {"name": "1393", "data": [{"saat2": 130.97, "maah2": "۰۱", "saal2": 1393 }, {"saat2": 185.17, "maah2": "۰۲", "saal2": 1393 }, {"saat2": 92.74, "maah2": "۰۳", "saal2": 1393 }, {"saat2": 112.7, "maah2": "۰۴", "saal2": 1393 }, {"saat2": 96.5, "maah2": "۰۵", "saal2": 1393 }, {"saat2": 91.14, "maah2": "۰۶", "saal2": 1393 }, {"saat2": 65.67, "maah2": "۰۷", "saal2": 1393 }, {"saat2": 71.23, "maah2": "۰۸", "saal2": 1393 }, {"saat2": 104.71, "maah2": "۰۹", "saal2": 1393 }, {"saat2": 105.18, "maah2": "۱۰", "saal2": 1393 }, {"saat2": 93.24, "maah2": "۱۱", "saal2": 1393 }, {"saat2": 98.95, "maah2": "۱۲", "saal2": 1393 }] }, {"name": "1394", "data": [{"saat2": 86.15, "maah2": "۰۱", "saal2": 1394 }, {"saat2": 47.4, "maah2": "۰۲", "saal2": 1394 }, {"saat2": 41.07, "maah2": "۰۳", "saal2": 1394 }, {"saat2": 51.99, "maah2": "۰۴", "saal2": 1394 }, {"saat2": 71.92, "maah2": "۰۵", "saal2": 1394 }, {"saat2": 682.53, "maah2": "۰۶", "saal2": 1394 }, {"saat2": 50.29, "maah2": "۰۷", "saal2": 1394 }, {"saat2": 87.66, "maah2": "۰۸", "saal2": 1394 }, {"saat2": 49.19, "maah2": "۰۹", "saal2": 1394 }, {"saat2": 60.7, "maah2": "۱۰", "saal2": 1394 }, {"saat2": 69.21, "maah2": "۱۱", "saal2": 1394 }, {"saat2": 54.23, "maah2": "۱۲", "saal2": 1394 }] }, {"name": "1395", "data": [{"saat2": 42.86, "maah2": "01", "saal2": 1395 }, {"saat2": 99.04, "maah2": "02", "saal2": 1395 }, {"saat2": 51.4, "maah2": "۰۳", "saal2": 1395 }, {"saat2": 29.83, "maah2": "۰۴", "saal2": 1395 }, {"saat2": 68.83, "maah2": "۰۵", "saal2": 1395 }, {"saat2": 68.18, "maah2": "۰۶", "saal2": 1395 }, {"saat2": 65.34, "maah2": "۰۷", "saal2": 1395 }, {"saat2": 61.82, "maah2": "۰۸", "saal2": 1395 }, {"saat2": 82.15, "maah2": "۰۹", "saal2": 1395 }, {"saat2": 129.64, "maah2": "۱۰", "saal2": 1395 }, {"saat2": 116.69, "maah2": "۱۱", "saal2": 1395 }, {"saat2": 117.1, "maah2": "۱۲", "saal2": 1395 }] }, {"name": "1396", "data": [{"saat2": 70.22, "maah2": "۰۱", "saal2": 1396 }, {"saat2": 109.9, "maah2": "۰۲", "saal2": 1396 }, {"saat2": 82.15, "maah2": "۰۳", "saal2": 1396 }, {"saat2": 55.22, "maah2": "۰۴", "saal2": 1396 }, {"saat2": 108.07, "maah2": "۰۵", "saal2": 1396 }, {"saat2": 98.84, "maah2": "۰۶", "saal2": 1396 }, {"saat2": 104.56, "maah2": "۰۷", "saal2": 1396 }, {"saat2": 84.16, "maah2": "۰۸", "saal2": 1396 }, {"saat2": 71.8, "maah2": "۰۹", "saal2": 1396 }, {"saat2": 123.09, "maah2": "۱۰", "saal2": 1396 }, {"saat2": 110.8, "maah2": "۱۱", "saal2": 1396 }, {"saat2": 162.28, "maah2": "۱۲", "saal2": 1396 }] }, {"name": "1397", "data": [{"saat2": 59.22, "maah2": "01", "saal2": 1397 }, {"saat2": 63.7, "maah2": "02", "saal2": 1397 }, {"saat2": 70.21, "maah2": "03", "saal2": 1397 }, {"saat2": 103.82, "maah2": "04", "saal2": 1397 }, {"saat2": 113.22, "maah2": "05", "saal2": 1397 }, {"saat2": 108.05, "maah2": "06", "saal2": 1397 }, {"saat2": 114.69, "maah2": "07", "saal2": 1397 }, {"saat2": 56.49, "maah2": "08", "saal2": 1397 }, {"saat2": 97.72, "maah2": "09", "saal2": 1397 }, {"saat2": 54.23, "maah2": "10", "saal2": 1397 }, {"saat2": 22.18, "maah2": "11", "saal2": 1397 }, {"saat2": 58.61, "maah2": "12", "saal2": 1397 }] }, {"name": "1398", "data": [{"saat2": 15.45, "maah2": "01", "saal2": 1398 }, {"saat2": 38.06, "maah2": "02", "saal2": 1398 }, {"saat2": 27.07, "maah2": "03", "saal2": 1398 }, {"saat2": 0.33, "maah2": "10", "saal2": 1398 }, {"saat2": 6.78, "maah2": "11", "saal2": 1398 }, {"saat2": 8.78, "maah2": "12", "saal2": 1398 }] }, {"name": "1399", "data": [{"saat2": 63.08, "maah2": "02", "saal2": 1399 }, {"saat2": 29.82, "maah2": "03", "saal2": 1399 }, {"saat2": 61.58, "maah2": "04", "saal2": 1399 }, {"saat2": 36.59, "maah2": "05", "saal2": 1399 }, {"saat2": 33.02, "maah2": "06", "saal2": 1399 }, {"saat2": 58.86, "maah2": "07", "saal2": 1399 }, {"saat2": 59.72, "maah2": "08", "saal2": 1399 }, {"saat2": 33.99, "maah2": "09", "saal2": 1399 }, {"saat2": 59.6, "maah2": "10", "saal2": 1399 }, {"saat2": 70.01, "maah2": "11", "saal2": 1399 }, {"saat2": 81.66, "maah2": "12", "saal2": 1399 }] }, {"name": "1400", "data": [{"saat2": 132.16, "maah2": "01", "saal2": 1400 }, {"saat2": 61.96, "maah2": "02", "saal2": 1400 }, {"saat2": 71.14, "maah2": "03", "saal2": 1400 }, {"saat2": 54.3, "maah2": "04", "saal2": 1400 }, {"saat2": 52.79, "maah2": "05", "saal2": 1400 }, {"saat2": 37.68, "maah2": "06", "saal2": 1400 }] }];

data.forEach(a => a.data.forEach(d => delete d['saal2']));
console.log(data);