Facing Problem in encoding array of dictionary to JSON

Question

In POST request I have to send following JSON data

{
    "users": [{"userid": 16, "meetAt":"Some place (College/trip etc)", "showFields": "11111111000"}, {"userid": 17, "meetAt":"Some place (College/trip etc)", "showFields": "11111111001"}]
}

I am trying

static func linkRequestBody(userDetails: ScannedContact) -> Any
{

    let jsonToRegistrer =  [["userid":userDetails.id, "meetAt":"Defalut Test Location at", "showFields":userDetails.showFields]];
    return jsonToRegistrer;
}

I can see in debugger that userDetails.id and userDetails.showFields have valid value but still it fails.

ERROR:

{"":["The input was not valid."]}

Answer 1

That's your target format:

{
    "users": [{
        "userid": 16,
        "meetAt": "Some place (College/trip etc)",
        "showFields": "11111111000"
    }, {
        "userid": 17,
        "meetAt": "Some place (College/trip etc)",
        "showFields": "11111111001"
    }]
}

After calling JSONSerialization on it (or if your code accept a Dictionary/Array and do the translation itself):

let jsonToRegistrer =  [["userid":userDetails.id, "meetAt":"Defalut Test Location at", "showFields":userDetails.showFields]];

Should represent that:

[{
    "userid": 16,
    "meetAt": "Defalut Test Location at",
    "showFields": "11111111000"
}]

You see the issue? Your version is an Array and the target one is a Dictionary and you are so missing the users key.

To fix it:

let jsonToRegistrer =  ["user": [["userid":userDetails.id, "meetAt":"Defalut Test Location at", "showFields":userDetails.showFields]]];

You can also not write it in one line to be clearer:

let jsonToRegistrer = ["user": [
                                 ["userid": userDetails.id,
                                  "meetAt": "Defalut Test Location at",
                                  "showFields": userDetails.showFields]
                                ]
                        ];

So the issue is that your version didn't have the same format at the one needed.

To see what's your version rendered in JSON you can use:

let jsonData = try? JSONSerialization.data(withJSONObject: jsonToRegistrer, options: .prettyPrinted)
let jsonString = String(data: jsonData!, encoding: .utf8) //Note it's a force unwrap but just to debug, avoid using force unwrap
print("jsonString: \(jsonString)")