Create specific Json in Swift 4 - ios

Question

I have to deliver some specific JSON to a webserver, but I'm very confused about how to use the correct arrays and dictionaries, so I can't get to my final result. I'm starting from this:
["entries": [
"member" : [
"id" : key,
"name" : value
],
"timestamp" : "\(dateString)"
]
]
in the JSON file I have to send to the server I can only have 1 "entries" and several "member" with specific "id" and "name" and timestamp. I'm aware that I have to use dictionaries but can't get to this result. This is what I tried so fare:
var leden = [Int: String]()
var jsonDict = [String: Any]()
var dateString = Date()
for (key, value) in leden{
jsonDict["\(key)"] = ["member" : [
"id" : key,
"naam" : value
],
"timestamp" : "\(dateString)"
]
}
jsonFinaal = ["entries": jsonDict]
this is as close as I could get, but good enough because the key in jsonDict should not be there, I added the "entries" in a second dictionary to make this a unique entry.
Anyone who can do beter to help me to the solution?

Answer 1

The value for members is an array of dictionaries, not a dictionary
This creates the structure sorted by the id keys
let leden = [1 : "Foo", 2: "Bar"]
let sortedKeys = leden.keys.sorted()
let dateString = Date()
var members = [[String:Any]]()
for key in sortedKeys {
let naam = leden[key]!
members.append(["member" : ["id" : key, "naam" : naam], "timestamp" : "\(dateString)"])
}
let entries = ["entries": members]
print(entries)
And the JSON string with
do {
let jsonData = try JSONSerialization.data(withJSONObject: entries)
let json = String(data: jsonData, encoding: .utf8)
print(json)
} catch { print(error) }