How to display JSON data from API? [duplicate] - ios

Question

This question already has an answer here:
Expected to decode Array<Any> but found a dictionary instead
(1 answer)
Closed 4 years ago.
I am developing in Swift 4 and currently using Walmart's API in order to display their products and certain information about the products (example: name of product, price of product). I have read and watched many tutorials regarding parsing JSON data however I continue to get the same error. If anyone could tell me why im getting an error it would be highly appreciated seeing I have been stuck on this issue for days.
Here is the JSON data I am getting from the API call:
{
query: "ipod",
sort: "relevance",
format: "json",
responseGroup: "base",
totalResults: 3570,
start: 1,
numItems: 10,
items: [
{
itemId: 15076191,
parentItemId: 15076191,
name: "Apple iPod Touch 4th Generation 32GB with Bonus Accessory Kit",
salePrice: 189
}
I just want to display the name and salePrice data but I am unable to do so at the moment, instead I get this error: typeMismatch(Swift.Array<Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array<Any> but found a dictionary instead.", underlyingError: nil))
Here is my data model:
struct Product: Codable {
let name: String
let salePrice: String
}
Here is the code in my ViewController class:
class ViewController: UIViewController {
import Foundation
import UIKit
var products: [Product]?
override func viewDidLoad() {
super.viewDidLoad()
let urlString = "http://api.walmartlabs.com/v1/search?query=sauce&format=json&apiKey=xyz"
guard let url = URL(string: urlString) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!.localizedDescription)
}
guard let data = data else { return }
//Implement JSON decoding and parsing
do {
//Decode retrived data with JSONDecoder and assing type of Article object
let productData = try JSONDecoder().decode([Product].self, from: data)
print(productData)
} catch let jsonError {
print(jsonError)
}
}.resume()
}
}

Answer 1

It will be like this,
struct Item: Codable {
let query: String
let sort: String
let responseGroup: String
let totalResults: Int
let start: Int
let numItems: Int
let items: [Product]
}
struct Product: Codable {
let name: String
let salePrice: CGFloat
}
Try using this,
let productData = try JSONDecoder().decode(Item.self, from: data)

Answer 2

Your json data is a dictionary not an array you either parse it and get the array , or try this
struct Item: Codable {
let query: String
let sort: String
let format: String
let responseGroup: String
let totalResults: Int
let start: Int
let numItems: Int
let items: [Product]
}
struct Product: Codable {
let itemId: Double
let parentItemId: Double
let name: String
let salePrice: Int
}
let productData = try JSONDecoder().decode(Item.self, from: data)