Failed to parse json data?

Question

JoePasadena OP

Created Aug ’18

Replies 2

Boosts 0

Views 6.9k

Participants 3

use JSONDecoder().decode

to parse data

{"aaa": "value", "bbb": 1}

it generated error:

Unexpected error: dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "No string key for value in object around character 1." UserInfo={NSDebugDescription=No string key for value in object around character 1.}))).

why?

Boost

Answer 1

junkpile OP

Aug ’18

You’ll probably need to post some code and/or do some debugging. Chances are the data isn’t what you think it is, maybe due to some character encoding issue. NSLog the raw data you’re trying to decode and post it here.

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Answer 2

DTS Engineer OP

Apple

Aug ’18

You’ll probably need to post some code and/or do some debugging.

Agreed.

@JoePasadena, I tried your JSON here in my office and it works for me:

import Foundation

struct Test : Codable {
    var aaa: String
    var bbb: Int
}
let json = "{\"aaa\": \"value\", \"bbb\": 1}".data(using: .utf8)!
let t = try! JSONDecoder().decode(Test.self, from: json)
print(t) // prints: Test(aaa: "value", bbb: 1)

I recommend that you convert the string to

Data

and then dump the hex of that. You can then look through the data for hidden characters, wonky text encodings, and so on.

You can print a hex dump as follows.

print(json as NSData)

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