iOS Swift:"JSON text did not start with array or object and option to allow fragments not set."

Question

When I converting Json string to dictionary in swift I got the Issue:Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

I don't know to fix the issue please give idea for fix the issue.Here I gave my code what i am tried..

The method for converting Json string to dictionary is,

func convertToDictionary(from text: String) throws -> [String: String] { guard let data = text.data(using: .utf8) else { return [:] } let anyResult: Any = try JSONSerialization.jsonObject(with: data, options: []) return anyResult as? [String: String] ?? [:] }

The Json String is: "[{\"propertyId\":\"1\",\"inspectionTemplateId\":1118,\"value\":[{\"widgetControllerId\":141,\"value\":\"Flood Summary Name\"},{\"widgetControllerId\":142,\"value\":\"Did the property flood?\"},{\"widgetControllerId\":143,\"value\":\"no\"}]}]"

And the Usage of method was:

let jsonString = NSString(data: responseObject as! Data, encoding: String.Encoding.utf8.rawValue)! print(jsonString) do { let dictionary:NSDictionary = try self.convertToDictionary(from: jsonString as String) as NSDictionary print(dictionary) } catch { print(error) }

Your JSON is invalid. Try running your test through a JSON validator first. — john elemans
– john elemans, Commented Jan 29, 2018 at 7:08
try using try JSONSerialization.jsonObject(with: data, options: [.allowFragments]) — Reinier Melian
– Reinier Melian, Commented Jan 29, 2018 at 7:11
Your JSON is an Array at top level by the way, an array of dictionary, but once you removed "\" before the ", it seems valid so you shouldn't get that error, you should get another one: returning empty: [:]. — Larme
– Larme, Commented Jan 29, 2018 at 7:12
Why do you convert Data to (NS)String and then back to Data? Print the data (print(data as NSData)) and post the first bytes. And don't use NSString and NSDictionary in Swift. — vadian
– vadian, Commented Jan 29, 2018 at 8:03

Pang · Accepted Answer · 2018-06-20 00:54:49Z

25

Read the error gentleman. Error is 'allow fragments not set'. Just Just just set .allowFragments. That's it. (Make sure response is not malformatted)

JSONSerialization.jsonObject(with: data!, options: .allowFragments)

edited Jun 20, 2018 at 0:54

Pang

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answered Jun 19, 2018 at 17:24

Aaban Tariq Murtaza

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3 Comments

J A S K I E R Over a year ago

Useful :) However, are there any global solution to check the data in JSON? Because now I have: Error serializing json Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0."

John Smith Over a year ago

@Oleksandr I assume its bc the plist is wrapped inside xml

RonH Over a year ago

Sorry, but where exactly is this setting found?

Pang · Accepted Answer · 2018-06-20 00:55:51Z

You can try this:

let str = "[{\"propertyId\":\"1\",\"inspectionTemplateId\":1118,\"value\":[{\"widgetControllerId\":141,\"value\":\"Flood Summary Name\"},{\"widgetControllerId\":142,\"value\":\"Did the property flood?\"},{\"widgetControllerId\":143,\"value\":\"no\"}]}]".utf8 let json = try! JSONSerialization.jsonObject(with: Data(str), options: []) print(json)

jcpennypincher · Accepted Answer · 2021-08-13 18:38:45Z

This type of issue can also occur if you have a misconfigured server or your server is unreachable. If you receive this type of error from JSON deserialization you may try converting the data to a string and print it out. It may reveal an error like "502 Bad Gateway"

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