Instructions for converting a JSON string into the proper format for a POST request in Swift

After using significant string interpolation, I have generated this JSON structure:

{
    "headers":{
        "email":"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="11747c70787d517469707c617d743f7e6376">[email protected]</a>",
        "rank":0,
        "blue":false,
        "team":1000,
        "round":33,
        "tournament_id":"7F98sdh98aFH98h"
    },
    "data":{
        "start_position":0.0,
        "crossed_line":true,
        "end_platform":true,
        "lift":0,
        "first-actions":[
            {
                "timestamp":1520403299.17746,
                "action":"0_0_1"
            }
        ],
        "second-actions":[
            {
                "timestamp":1520403299.96991,
                "action":"0_0_2"
            }
        ]
     }
}

In an attempt to add this JSON to my POST request's httpBody, I used the following code snippet:

request.httpBody = json.data(using: .utf8)

However, it led to a 422 error.

On the Server side, everything in the string was treated as one header:

--- NEW REQUEST ---
Time: March 6th 2018, 8:47:23 pm (1520398043327)
IP: [REDACTED]
Request: [REDACTED]
req.body = {'{"headers":{"email":"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5f3a323e36331f3a273e322f333a71302d38">[email protected]</a>","rank":0,"blue":false,"team":1000,"round":20,"tournament_id":"7F98sdh98aFH98h",},"data":{"start_position":-36.5385,"crossed_line":true,"end_platform":true,"lift":0,"first-actions":[{"timestamp":1520398021.45196,"action":"0_0_1"}],"second-actions":[{"timestamp":1520398022.73314,"action":"0_0_2"}]}}':''}
Auth: [REDACTED]
Auth level: 10

Then, I realized that it needs to be sent as a JSON Object instead of a string. Various methods were attempted, like converting json into a Dictionary, but then converting to Data resulted in a runtime error.

Can you provide guidance on how to convert the string into the correct format?

UPDATE: Outcome from Dávid's response:

--- NEW REQUEST: 60 ---
[REQ 60] Time: March 7th 2018, 8:52:39 pm (1520484759369)
[REQ 60] IP: [REDACTED]
[REQ 60] Request: [REDACTED]
[REQ 60] req.body = { '{"headers":{"team":"1000","email":"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="17727a767e7b57726f767a677b7239786570">[email protected]</a>","rank":"0","blue":"false","round":"22","tournament_id":"7F98sdh98aFH98h"},"data":{"lift":"0","crossed_line":"true","end_platform":"true","first-actions":[{"timestamp":0,"action":"0_0_0"},{"timestamp":1520484747.061681,"action":"0_0_1"}],"second-actions":[{"timestamp":0,"action":"0_0_0"},{"timestamp":1520484747.9255838,"action":"0_0_2"}],"start_position":"0.0"}}': '' }
Auth: [REDACTED]
iosjsonswiftposttype-conversion

Answer â„–1

To start, it's important to note that constructing JSON objects using String interpolation is not the recommended approach. Instead, you should create a proper object like a `Dictionary` for this purpose.

Once you have collected all the necessary data in a variable of type `Dictionary`, you can then convert it into JSON format utilizing either the `JSONSerialization` or `JSONEncoder` APIs.


let email = "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="254048444c4965405d44485549400b4a5742">[email protected]</a>"
let dictionary = ["headers":["email":email,"rank":0, "blue":false,"team":1000,"round":33, "tournament_id":"7F98sdh98aFH98h"], "data":[ "start_position":0.0, "crossed_line":true, "end_platform":true, "lift":0, "first-actions":[["timestamp":1520403299.17746,"action":"0_0_1"]],"second-actions":[[ "timestamp":1520403299.96991, "action":"0_0_2"]]]]
do {
    let jsonEncodedDictionary = JSONSerialization.data(withJSONObject: dictionary)
    request.httpBody = jsonEncodedDictionary
} catch {
    //It's essential to handle errors appropriately based on your specific requirements
    print(error)
}

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