How to convert html response into json - json

Question

I want to put received html response into existing json.
I have 2 pages. From first page i send post request with ajax.
At the second page i process post and read data with mysq then i echo the data and send them as response back to first page.
Again at first page i want to use this incoming response and fit it into the json.
you can view image below. this is how it looks when i write it ot the console but when i assign the value to data json object, nothing happens.
var data = {
'type': 'FeatureCollection',
'features': [{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [26.800394, 39.616144]
},
'properties': {
'title': 'Durum',
'description': '26.800394, 39.616144'
}
}, {
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [28.879391, 39.418753]
},
'properties': {
'title': 'Durum',
'description': '28.879391, 39.418753'
}
},]
};
map.on('click', function(e) {
$.ajax({
type: "POST",
url: "load_data_3.php",
data:
"request=request",
success: function (response) {
value = response;
console.log(value);
},
});
data = value;
map.getSource('earthquakes').setData(data);
});
// This is the data received and then writtend to the console (This is what i see)
enter image description here