Save JSON response as JSON file - json

Question

I want to save my JSON response to a JSON file in document or any other directory.
Earlier I was trying to save the response in coreData but that was a heavy and slow task.
//API Manager function
func loadEmployees(urlString: String, completion: #escaping ((Any?,Error?) -> ())){
guard let url = URL(string: urlString) else { return }
var request = URLRequest(url: url)
request.httpMethod = RequestMethod.get.rawValue
let session = URLSession.shared
let sessionTask = session.dataTask(with: request) { (data, response, error) in
if error == nil {
let result = try? JSONDecoder().decode([EmployeeDetails].self, from: data!)
completion(result, nil)
}
else {
completion(nil, ServiceError.customError("Please check your internet connection"))
}
}
sessionTask.resume()
}
//I am calling it in my View Controller
NetworkManager.sharedInstance.loadEmployees(urlString: EMPLOYEEBASEURL, completion: { (data, responseError) in
if let error = responseError {
self.showToast(controller: self, message: error.localizedDescription, seconds: 1.6)
}else{
if data != nil {
DispatchQueue.global().async {
self.employeeListArray = data as! [EmployeeDetails]
self.filteredEmployeeArray = self.employeeListArray
DispatchQueue.main.async {
self.loader.isHidden = true
self.employeeTableView.reloadData()
}
}
}
}
})
//My model
struct EmployeeDetails: Decodable {
let id: String?
let name: String?
let salary: String?
let age: String?
let profileImage: String?
enum CodingKeys: String, CodingKey {
case id = "id"
case name = "employee_name"
case salary = "employee_salary"
case age = "employee_age"
case profileImage = "profile_image"
}
}
Now Instead of parsing it directly I want to save the response in a json file and parse from the file.
I can install any pods if required, my Project is in Swift 5.0 so newer methods are also acceptable.

Answer 1

To save:-
func saveJsonFile(_ name:String, data:Data) {
// Get the url of File in document directory
guard let documentDirectoryUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let fileUrl = documentDirectoryUrl.appendingPathComponent(name + ".json")
// Transform array into data and save it into file
do {
//let data = try JSONSerialization.data(withJSONObject: list, options: [])
try data.write(to: fileUrl, options: .completeFileProtection)
} catch {
print(error)
}
}
Retrive:-
func retrieveFromJsonFile(_ name:String) -> [JSONObject]? {
// Get the url of File in document directory
guard let documentsDirectoryUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return nil}
let fileUrl = documentsDirectoryUrl.appendingPathComponent(name + ".json")
// Check for file in file manager.
guard (FileManager.default.fileExists(atPath: fileUrl.path))else {return nil}
// Read data from .json file and transform data into an array
do {
let data = try Data(contentsOf: fileUrl, options: [])
guard let list = try JSONSerialization.jsonObject(with: data, options: []) as? [JSONObject] else { return nil}
//print(list)
return list
} catch {
print(error)
return nil
}
}
Delete json file:-
func removeFile(with name: String){
// Path for the file.
guard let documentsDirectoryUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return}
let fileUrl = documentsDirectoryUrl.appendingPathComponent(name + ".json")
if (FileManager.default.fileExists(atPath: fileUrl.absoluteString)){
do{
try FileManager.default.removeItem(at: fileUrl)
}catch{
print(error.localizedDescription)
}
}
}
where JSONObject:- [String: Any]