Swift - Convert JSON dictionary into a pretty printed string

swift-dictionary-prettyprint.swift

public extension Dictionary {
    /// Returns a pretty printed JSON version of the current dictionary.
    /// String uses white space and indentation to make the resulting data more readable.
    var prettyPrintedJson: String {
        do {
            let data = try JSONSerialization.data(withJSONObject: self, options: [.withoutEscapingSlashes, .prettyPrinted])
            return String(data: data, encoding: .utf8) ?? ""
        } catch {
            return ""
        }
    }
}

This extension allows to pretty print a JSON dictionary, removing type definition used by Swift.

This is a JSON printed using standard string interpolation:

[AnyHashable("aps"): {
    alert =     {
        body = "Here's to the crazy ones. The misfits. The rebels. The troublemakers. The round pegs in the square holes.";
        title = "Think different";
    };
    "content-available" = 1;
    "mutable-content" = 1;
}, AnyHashable("data"): {
}]

And this is the result using the prettyPrintedJson extension:

{
  "aps" : {
    "alert" : {
      "title" : "Think different",
      "body" : "Here's to the crazy ones. The misfits. The rebels. The troublemakers. The round pegs in the square holes."
    },
    "mutable-content" : 1,
    "content-available" : 1
  },
  "data" : {

  }
}