Extension for JSONObject from https://gist.github.com/jarsen/b27de2ed9e84b84086ae

JSONObject+extensions.swift

extension JSONObject {
    /// Returns a JSON object initialized by reading into it the data from the file specified by a given path.
    /// - Parameter path: The absolute path of the file from which to read data.
    /// - Returns: A JSON object initialized by reading into it the data from the file specified by path.
    convenience init?(contentsOfFile path: String) {
        guard let data = NSData(contentsOfFile: path),
                  json = (try? NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)) as? [String : AnyObject] else { return nil }
        self.init(dictionary: json)
    }
}