foo.json

 [
  {
  "id": 0,
  "name": "comida",
  "price": 0.99,
  "description": "this is the description",
  "deckImage": "this is a UIImage",
  "deckBgImage": "this is a UIImage",
  "bought": false,
  "cards": [
              {
                "name": "card name 1"
              },
              {
                "name": "card name 2"
              },
              {
                "name": "card name 3"
              }
          ]
  },
  
  {
  "id": 1,
  "name": "comida",
  "price": 0.99,
  "description": "this is the description",
  "deckImage": "this is a UIImage",
  "deckBgImage": "this is a UIImage",
  "bought": false,
  "cards": [
            {
            "name": "card name 1"
            },
            {
            "name": "card name 2"
            },
            {
            "name": "card name 3"
            }
            ]
  }
  
  
  ]

foobar.swift

guard let path = Bundle.main.path(forResource: "files", ofType: "json") else { return print("file no existo") }
    let url = URL(fileURLWithPath: path)
    
    do {
      

      
      let data = try Data(contentsOf: url)
      let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers)
      
      guard let array = json as? [Any] else { return }
      
      for obj in array {
        
        var totalCards = [String]()
        
        guard let deck = obj as? [String: Any] else { return }
        guard let deckName = deck["name"] as? String else { return }
        guard let deckDescription = deck["description"] as? String else { return }
        guard let deckImage = deck["deckImage"] as? String else { return }
        guard let deckBgImage = deck["deckBgImage"] as? String else { return }


        guard let cards = deck["cards"]! as? [[String: String]] else { return }
        
        for card in cards {
          let currentCard = card["name"]
          print(currentCard!)
          totalCards.append(currentCard!)
          
        }
        
        let finalizedDeck = createDeck(withName: deckName, withCards: totalCards, description: deckDescription, deckImage: deckImage, descriptionBg: deckBgImage)
        
        boughtDecks.append(finalizedDeck)
        
      }
    } catch {
      print(error)
    }
  }

zoo.json

Cannot convert value of type 'String' to expected argument type 'UIImage'