ios - Convert Json string to Json object in Swift 4

Question

I try to convert JSON string to a JSON object but after JSONSerialization the output is nil in JSON.

Response String:

[{"form_id":3465,"canonical_name":"df_SAWERQ","form_name":"Activity 4 with Images","form_desc":null}]

I try to convert this string with my code below:

let jsonString = response.result.value
let data: Data? = jsonString?.data(using: .utf8)
let json = (try? JSONSerialization.jsonObject(with: data, options: [])) as? [String:AnyObject]
 print(json ?? "Empty Data")

Answer 1

The problem is that you thought your jsonString is a dictionary. It's not.

It's an array of dictionaries. In raw json strings, arrays begin with [ and dictionaries begin with {.

---

I used your json string with below code :

let string = "[{"form_id":3465,"canonical_name":"df_SAWERQ","form_name":"Activity 4 with Images","form_desc":null}]"
let data = string.data(using: .utf8)!
do {
    if let jsonArray = try JSONSerialization.jsonObject(with: data, options : .allowFragments) as? [Dictionary<String,Any>]
    {
       print(jsonArray) // use the json here     
    } else {
        print("bad json")
    }
} catch let error as NSError {
    print(error)
}

and I am getting the output :

[["form_desc": <null>, "form_name": Activity 4 with Images, "canonical_name": df_SAWERQ, "form_id": 3465]]