Fetching Data from API in Swift - json

Question

So I am trying to fetch data from the Pokemon API, and I am getting stuck at the point where I am trying to decode the JSON into a struct. Here is my code:
{
"count":1118,
"next":"https://pokeapi.co/api/v2/pokemon/?offset=20&limit=20",
"previous":null,
"results":
[
{"name":"bulbasaur","url":"https://pokeapi.co/api/v2/pokemon/1/"},
{"name":"ivysaur","url":"https://pokeapi.co/api/v2/pokemon/2/"},
{"name":"venusaur","url":"https://pokeapi.co/api/v2/pokemon/3/"},
{"name":"charmander","url":"https://pokeapi.co/api/v2/pokemon/4/"},
{"name":"charmeleon","url":"https://pokeapi.co/api/v2/pokemon/5/"},
{"name":"charizard","url":"https://pokeapi.co/api/v2/pokemon/6/"},
{"name":"squirtle","url":"https://pokeapi.co/api/v2/pokemon/7/"},
{"name":"wartortle","url":"https://pokeapi.co/api/v2/pokemon/8/"},
{"name":"blastoise","url":"https://pokeapi.co/api/v2/pokemon/9/"},
{"name":"caterpie","url":"https://pokeapi.co/api/v2/pokemon/10/"},
{"name":"metapod","url":"https://pokeapi.co/api/v2/pokemon/11/"},
{"name":"butterfree","url":"https://pokeapi.co/api/v2/pokemon/12/"},
{"name":"weedle","url":"https://pokeapi.co/api/v2/pokemon/13/"},
{"name":"kakuna","url":"https://pokeapi.co/api/v2/pokemon/14/"},
{"name":"beedrill","url":"https://pokeapi.co/api/v2/pokemon/15/"},
{"name":"pidgey","url":"https://pokeapi.co/api/v2/pokemon/16/"},
{"name":"pidgeotto","url":"https://pokeapi.co/api/v2/pokemon/17/"},
{"name":"pidgeot","url":"https://pokeapi.co/api/v2/pokemon/18/"},
{"name":"rattata","url":"https://pokeapi.co/api/v2/pokemon/19/"},
{"name":"raticate","url":"https://pokeapi.co/api/v2/pokemon/20/"}
]
}
func fetchPokemon() {
let defaultSession = URLSession(configuration: .default)
if let url = URL(string: "https://pokeapi.co/api/v2/pokemon/") {
let request = URLRequest(url:url)
let dataTask = defaultSession.dataTask(with: request, completionHandler: { (data, response, error) -> Void in
guard error == nil else {
print ("error: ", error!)
return
}
guard data != nil else {
print("No data object")
return
}
guard let httpResponse = response as? HTTPURLResponse, (200...299).contains(httpResponse.statusCode) else {
print("response is: ", response!)
return
}
guard let mime = response?.mimeType, mime == "application/json" else {
print("Wrong MIME type!")
return
}
DispatchQueue.main.async {
guard let result = try? JSONDecoder().decode(PokemonList.self, from: data!) else {
print("Error Parsing JSON")
return
}
let pokemon = result.pokemon
self.Pokemon = pokemon
print(self.Pokemon)
}
})
dataTask.resume()
}
}
and here is the pokemon struct:
struct Pokemon {
// Various properties of a post that we either need or want to display
let name: String
let url: String
}
extension Pokemon: Decodable {
// properties within a Post returned from the Product Hunt API that we want to extract the info from.
enum PokemonKeys: String, CodingKey {
// first three match our variable names for our Post struct
case name = "name"
case url = "url"
}
init(from decoder: Decoder) throws {
let postsContainer = try decoder.container(keyedBy: PokemonKeys.self)
name = try postsContainer.decode(String.self, forKey: .name)
url = try postsContainer.decode(String.self, forKey: .url)
}
}
struct PokemonList: Decodable {
var pokemon: [Pokemon]
}
It keeps reaching the point when decoding which says "Error Parsing JSON". I'm assuming that there may be an error in how I setup the pokemon struct?
Any ideas?

Answer 1

you are getting a parse error because the data model is not the same. your struct should be:
struct PokemonList: Decodable {
var results: [Pokemon]
var count: Int
var next: String
}
you don't need the extension.