Parsing a specific content out of a dictionary in a json file - json

Question

I'm getting the error "Cannot cast value of type dictionary to array" when I run my code. I'm tryna parse from a json file but its not working. Please help.
Here's the json file and i'm specifically tryna print out just the name values:
{
"data": [
{
"id": "2f4628f7ef6dce33d856121f",
"name": "Top products",
"description": "This category contains all the top products on"
},
{
"id": "3f4628f7ef6dce33d856121d",
"name": "Trending products",
"description": "This category contains all the trending products"
}
],
"page": 0,
"size": 2,
"count": 2,
"status": 200,
"isSuccess": true
}
func fetchFrontPageSections() {
let urlString = APIConstants.baseurl + APIConstants.frontpageSections
guard let url = URL(string: urlString) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!)
return
}
do {
let jsonData = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers)
for dictionary in jsonData as! [[String: AnyObject]] {
print(dictionary["name"])
}
} catch let jsonError {
print(jsonError)
}
}.resume()
}
When I print the dictionary I'm getting that whole son file in my console which is fine but Im expecting to get a result like:
name: Top Products
name: Trending Products

Answer 1

In your constant jsonData you don't have an array, it's a dictionary as your json file explicitly show it. It contains multiple keys such as data, page, size, ...
You shoud access first the value related to the key data that contains an at this point the array of dictionary that you are looking for.

Answer 2

Parsing Json in Swift has never been easier since Codable.
here's an Excellent tutorial from the great guys at Ray Wenderlich: https://www.raywenderlich.com/3418439-encoding-and-decoding-in-swift
for your specific problem try this:
struct Info: Decodable {
let id: String
let name: String
let description: String
}
struct Dictionary: Decodable {
let data: [Info]
let page: Int
let size: Int
let count: Int
let status: Int
let isSuccess: Bool
}
let decoder = JSONDecoder()
let dictionary = try decoder.decode(Dictionary.self, from: json)