Issue with parsing JSON file

April 10, 2022

I am trying to parse a JSON file from a PHP web page on my website using Swift, i get the error "Cannot find ‘allnames’ in scope" on Xcode.
Please find here my code for Swift :

let serviceUrl = "http://***"
        let url = URL(string: serviceUrl)!
        guard url != nil else {
            return
        }

        let session = URLSession.shared

        let dataTask = session.dataTask(with: url){ (data, response, error) in
            
            if error != nil {
                print("Failed to download data")
            }else {
                let decoder = JSONDecoder()
                
                do{
                    let allnames = try decoder.decode(Entry.self, from: data!)
                }catch{
                    print("Error in JSON parsing")
                }
                
                print(allnames)
            }
        }
        dataTask.resume()
    }

Thank you for your answers !

>Solution :

your variable allnames is out of scope, you have to declare it outside.
change the declaration like me,

    let serviceUrl = "http://***"
    let url = URL(string: serviceUrl)!
    guard url != nil else {
        return
    }

    let session = URLSession.shared

    let dataTask = session.dataTask(with: url){ (data, response, error) in
        
        if error != nil {
            print("Failed to download data")
        }else {
            let allnames = []
            let decoder = JSONDecoder()
            
            do{
                allnames = try decoder.decode(Entry.self, from: data!)
            }catch{
                print("Error in JSON parsing")
            }
            
            print(allnames)
        }
    }
    dataTask.resume()
}