Swift AlamoFire PUT request - swift

Question

I have a JSON file with this struct:
{
"example": {
"projects": [
{ "projectname" : "abc",
"date" : "20200930",}
{ "projectname" : "bac",
"date" : "20200803",}
]
}
}
I want to update first projectname, but not the date connected to it. But the AF.request method give me back error 400 (Invalid JSON body passed.)
let user = "username"
let password = "password"
let params = ["example":
["projects":
["projectname": "New Name"]
]
]
let credentialData = "\(user):\(password)".data(using: String.Encoding(rawValue: String.Encoding.utf8.rawValue))!
let base64Credentials = credentialData.base64EncodedString()
let headers : HTTPHeaders = [
"Authorization": "Basic \(base64Credentials)",
"Accept": "application/json",
"Content-Type": "application/json" ]
AF.request("https://example.com/api", method: .put, parameters: params, headers: headers).responseJSON { AFdata in
do {
guard let jsonObject = try JSONSerialization.jsonObject(with: AFdata.data!) as? [String: Any] else {
print("Error: Cannot convert data to JSON object")
return
}
guard let prettyJsonData = try? JSONSerialization.data(withJSONObject: jsonObject, options: .prettyPrinted) else {
print("Error: Cannot convert JSON object to Pretty JSON data")
return
}
guard let prettyPrintedJson = String(data: prettyJsonData, encoding: .utf8) else {
print("Error: Could print JSON in String")
return
}
print(prettyPrintedJson)
} catch {
print("Error: Trying to convert JSON data to string")
return
}
}
Thanks for your help!

Answer 1

I believe you are missing the encoder parameter in you request:
AF.request("https://example.com/api", method: .put, parameters: params, headers: headers, encoder: JSONParameterEncoder.default).responseJSON { AFdata in
Without it Alamofire cannot know that your parameters should be encoded as JSON.