Pretty print JSON string from Data in Swift 4.1 (especially useful printing to Xcode console)

Data+PrettyPrint.swift

import Foundation

extension Data {
    var prettyPrintedJSONString: NSString? { /// NSString gives us a nice sanitized debugDescription
        guard let object = try? JSONSerialization.jsonObject(with: self, options: []),
              let data = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted]),
              let prettyPrintedString = NSString(data: data, encoding: String.Encoding.utf8.rawValue) else { return nil }

        return prettyPrintedString
    }
}

let str = "{\"foo\": \"bar\"}".data(using: .utf8)!.prettyPrintedJSONString!
debugPrint(str)
/* prints:
 {
    "foo" : "bar"
 }
*/

Thanks!

Thanks

Thanks :)

Works pretty well, thanks

let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted

Swift 5.1

extension Data {
    var prettyJson: String? {
        guard let object = try? JSONSerialization.jsonObject(with: self, options: []),
              let data = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted]),
              let prettyPrintedString = String(data: data, encoding:.utf8) else { return nil }

        return prettyPrintedString
    }
}

Adding the .sortedKeys option to JSONSerialization.data is nice.

Super cool, thanks!

Is there a version of this for XML?

Swifty version

extension Encodable {
    var prettyPrintedJSONString: String? {
        let encoder = JSONEncoder()
        encoder.outputFormatting = .prettyPrinted
        guard let data = try? encoder.encode(self) else { return nil }
        return String(data: data, encoding: .utf8) ?? nil
    }
}

Swift 5.1

extension Data {
    var prettyJson: String? {
        guard let object = try? JSONSerialization.jsonObject(with: self, options: []),
              let data = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted]),
              let prettyPrintedString = String(data: data, encoding:.utf8) else { return nil }

        return prettyPrintedString
    }
}

This is not ok. we must use NSString not String.

Using String instead of NSString won't do any harm (documentation).

Using String instead of NSString won't do any harm (documentation).

@DevNebulae NSString intentional, note comment: /// NSString gives us a nice sanitized debugDescription

Great!

Yes! using NSString its seems to be awesome 👏

Thank you

ty!!

Thank you

Swifty version

extension Encodable {
    var prettyPrintedJSONString: String? {
        let encoder = JSONEncoder()
        encoder.outputFormatting = .prettyPrinted
        guard let data = try? encoder.encode(self) else { return nil }
        return String(data: data, encoding: .utf8) ?? nil
    }
}

Best option!! 😍

thanks