Parsing JSON from Url Ends Up with an Error - Swift 5

Parsing JSON from URL ends up with an Error - Swift 5

Here is how to decode all the json data into a swift struct:

import Foundation

struct Stations: Codable {
    let company: [String]
    let href: String
    let id: String
    let location: LocationJson
    let name: String
    let stations: [Station]

}

struct Station: Codable {
    let empty_slots: Int
    let extra: Extra
    let free_bikes: Int
    let id: String
    let latitude: Double
    let longitude: Double
    let name: String
    let timestamp: String

}

struct ResponseJSON: Codable {
    let network: Stations
}

struct LocationJson: Codable {
    let city: String
    let country: String
    let latitude: Double
    let longitude: Double
}

struct Extra: Codable {
    let slots: Int
    let status: String
    let uid: String
}

func getBikeData(){
    guard let url = URL(
        string: "https://api.citybik.es//v2/networks/baksi-bisim"
    ) else { return }

    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        guard let dataResponse = data, error == nil else {
            print(error?.localizedDescription ?? "Response Error")
            return
        }
        do {
            //here dataResponse received from a network request
            let jsonResponse = try JSONSerialization.jsonObject(with:
                                   dataResponse, options: [])
            print(jsonResponse) //Response result

            do {
                //here dataResponse received from a network request
                let decoder = JSONDecoder()
                //Decode JSON Response Data

                let model = try decoder.decode(
                    ResponseJSON.self, from: dataResponse
                )
                print(model) //Output - 1221

            } catch let parsingError {
                print("Error", parsingError)
            }

         } catch let parsingError {
            print("Error", parsingError)
         }
    }
    task.resume()

}

getBikeData()

Swift 5 Json parsing error dataCorrupted

// problem in response type and encoding. It should be application/json and //unicode but actually it is:
//response content-type: text/plain; charset=ISO-8859-1

struct Facts:Codable {
    let title: String
    let rows: [Rows]!
}
struct Rows:Codable {
    var title: String?
    var description: String?
    var imageHref: String?
}

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let jsonUrlString = "https://dl.dropboxusercontent.com/s/2iodh4vg0eortkl/facts.json"

        guard let url = URL(string: jsonUrlString) else{return}
//        var request = URLRequest(url: url)
//        request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")  // the request is JSON
//        request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")        // the expected response is also JSON

        URLSession.shared.dataTask(with: url) { (data, response, error) in
        guard let data = data else { return }
        guard let string = String(data: data, encoding: String.Encoding.isoLatin1) else { return }
        guard let properData = string.data(using: .utf8, allowLossyConversion: true) else { return }
        do{
        let facts = try JSONDecoder().decode(Facts.self, from: properData)
        //dump(facts)
            print(facts.title)
            for row in facts.rows {
            print(row.title ?? "no title")
            print(row.description ?? "no description")
            print(row.imageHref ?? "no img url")
            print("---")

            }
        } catch let error {
        print(error)
        }
        }.resume()

    }

}    

swift Parsing JSON from URL

I cleaned things up a bit, drop the NS stuff and protected results with guard.

let url = URL(string: "http://localhost.192.168.1.40.xip.io:8888/store1.php")!

URLSession.shared.dataTask(with: url) { data, _, _ in
    guard let data = data else { return }
    guard let json = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) else { return }
    guard let jsonObj = json as? [String: Any] else { return }

    guard let telefon = jsonObj["telefon"] as? String else { return }

    print(telefon)
}

---

A bit more debugging.

let url = URL(string: "http://localhost.192.168.1.40.xip.io:8888/store1.php")!

URLSession.shared.dataTask(with: url) { data, _, _ in
    guard let data = data, !data.isEmpty else {
        print("Error: data is nil or empty")
        return
    }

    guard let json = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) else {
        print("Error: data contains no JSON")
        return
    }

    guard let jsonObj = json as? [String: Any] else {
        print("Error: JSON is not a dictionary")
        return
    }

    guard let telefon = jsonObj["telefon"] as? String else {
        print("Error: Object has no 'telefon' key")
        return
    }

    print(telefon)
}

Trying to parse Json data into model Class this getting error while using codable

As error says: let error: String? error property is expected to be a String type - but server returns a Dictionary there.

The JSON you posted seems to have null there, but probably error is shown due to different JSON data - one that has error object.

Gets error when getting data from API in Swift: Expected to decode DictionaryString, Any but found an array instead.

The JSON data contains a list of fruits (an array), but you try to decode a FruitsData. It would expect the JSON top-level to look like this:

{
    "fruits": [ … ]
}

Instead, you need to decode an array of fruits directly like this:

var fruits:[Fruit]?
do {
    fruits = try JSONDecoder().decode([Fruit].self, from: data)
}
catch {
    print(String(describing: error))
}

---

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