How to serialize a Json partially? - json

Question

I have a huge json (20 mb, 6000+ records) that If I use decode it takes ages, then I started using serialize to try to parse it in pieces. But I'm having trouble to parse it (getting null when I serialize it, funny enough I don't specify as? [String:Any] I actually get the json)
is there a better way to parse a Json partially?
Json structure
[
{
"page": 1,
"total": 100,
"data": [
{
"address": "677 Quincy Street #1B",
"neighborhood": "Stuyvesant Heights",
"zipcode": "11221",
"latitude": 40.68935935,
"longitude": -73.93179845,
"bedroom": "2 beds",
"bath": "1.5 baths",
"area": null,
"status": "current",
"photos": [
"https://photos.zillowstatic.com/fp/b444ec7e07f1bb83f27c6dfa2167e92a-se_extra_large_1500_800.jpg"
],
"video": null,
"description": "NO FEE!!Luxury 2 BR / 1.5 Bath DUPLEX Apartment",
"new_listing": 1,
"date_available": "Available Now",
"open_house": null,
"price": 2999,
"dishwasher": false,
"washer_and_dryer": false,
"pets_allowed": true,
"live_in_super": false,
"elevator": false,
"url": "https://streeteasy.com/building/677-quincy-street-brooklyn/1b"
},
]
}
]

Answer 1

I made it work, but sadly serialization doesn't help with the load speed, I was thinking to do "pagination with the first 100 items" but swift needs to parse the entire json first.
//serialization baby!
let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [[String:Any]]
//make it an array
let first100Listings = json!.first!["data"] as? NSArray
let jsonData = try JSONSerialization.data(withJSONObject: first100Listings!, options: [])
let responseModel = try JSONDecoder().decode([Listings].self, from: jsonData)
self.listingsZ = responseModel