Converting Dictionary to JSON in Swift: Step-by-Step Guide

Hi everyone! I'm new to Swift and trying to understand JSON. I need to send data to the server in JSON format, and I'm storing it as a dictionary `[String: Any]`. For example, I have this dictionary: ```swift let userDict: [String: Any] = [ "name": "Ivan", "age": 30, "isActive": true, "address": [ "city": "Moscow", "zip": "101000" ] ] ``` I tried using `JSONSerialization`, but I keep getting errors. Here's my code: ```swift let jsonData = try JSONSerialization.data(withJSONObject: userDict, options: .prettyPrinted) ``` Error: `"Invalid value around key 'age'."` — I don't understand why this is happening. I read the documentation, but it seems complicated. Please advise how to properly convert a dictionary to JSON? Do I need to somehow validate