With swifter json response - swift

Question

I am create simple rest api with swift using swifter library
How i can response json data?
import Swifter
let server = HttpServer()
server["/hello"] = { request in
var userList:[Any] = []
for user in users {
var b : [String: Any] = [:]
b["name"] = user.name
b["id"] = user.id
userList.append(b)
}
return .ok(.json(userList))
}
But there is below error message
Serialization error: invalidObject
I check the library source code, and found the error message reason
...
//Library Source code
func content() -> (Int, ((HttpResponseBodyWriter) throws -> Void)?) {
do {
switch self {
case .json(let object):
guard JSONSerialization.isValidJSONObject(object) else {
throw SerializationError.invalidObject
}
let data = try JSONSerialization.data(withJSONObject: object)
return (data.count, {
try $0.write(data)
})
...
So, I need pass guard JSONSerialization.isValidJSONObject(object) else {
also, there is no enough document for the library, How I can fix this problem ?

Answer 1

Use codable and a jsonEncoder to convert the users array to data and then convert them back to a jsonObject and pass it in:
do {
let jsonEncoder = JSONEncoder()
let jsonData = try jsonEncoder.encode(users)
let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options: [])
return .ok(.json(jsonObject))
} catch {
print(error)
return .internalServerError(.htmlBody("\(error.localizedDescription)"))
}
Note that you should consider returning an error to the caller of the service. I've used .internalServerError but you may consider returning a better error.