How to parse json response swift3?

Question

My response looks like this:

[
    {
        "Part" : {
            "id" : "418502",
            "uuid" : "21ec7cdb-cd2d-4b12-8a90-775762eb0f26"
        },
        "Category" : {
            "category_name" : "Regulators",
            "category_code" : "RG"
        }
    },
    {
        "Part" : {
             "id" : "418502",
             "uuid" : "21ec7cdb-cd2d-4b12-8a90-775762eb0f26"
        },
        "Category" : {
             "category_name" : "Regulators",
             "category_code" : "RG"
        }
    }
]

So I need to parse the above response to get Part array and Category array. After searching in google I found:

let resultJson = try JSONSerialization.jsonObject(with: data, options: []) as? [String : AnyObject]
print(resultJson!)

But it throws fatal error: unexpectedly found nil while unwrapping an Optional value.

I'm new to swift I don't know how to convert it. I have completed this in Android so I can surely say I get above response from server. I write a common function for calling web service, it works for other services so I think there is no problem in that.

How can I parse my response so I can get Part array and Category array? Thank you.

stackoverflow.com/questions/41734982/…

Umair Afzal
– Umair Afzal

2017-07-06 04:44:07 +00:00
Commented Jul 6, 2017 at 4:44 — Umair Afzal
– Umair Afzal, Commented Jul 6, 2017 at 4:44
Possible duplicate of Correctly Parsing JSON in Swift 3

vadian
– vadian

2017-07-07 04:00:25 +00:00
Commented Jul 7, 2017 at 4:00 — vadian
– vadian, Commented Jul 7, 2017 at 4:00

Fangming · Accepted Answer · 2017-07-05 14:58:23Z

2

Your JSON structure has a top level array, so you cannot parse is as a dictionary. Try to do this

let resultJson = try JSONSerialization.jsonObject(with: data, options: []) as? [Any]
dump(resultJson!)

Sample code will be something like this. Don't forget to handle unwrap stuff

let str = "[{\"Part\":{\"id\":\"418502\",\"uuid\":\"21ec7cdb-cd2d-4b12-8a90-775762eb0f26\"},\"Category\":{\"category_name\":\"Regulators\",\"category_code\":\"RG\"}},{\"Part\":{\"id\":\"418502\",\"uuid\":\"21ec7cdb-cd2d-4b12-8a90-775762eb0f26\"},\"Category\":{\"category_name\":\"Regulators\",\"category_code\":\"RG\"}}]"

let data = str.data(using: .utf8)

do{
    let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? [Any]
    let dicInFirstElement = json?[0] as? [String: Any]
    let part = dicInFirstElement?["Part"]
    dump(part)
    //Pass this json into the following function
}catch let error{

}

edited Jul 5, 2017 at 14:58

answered Jul 5, 2017 at 14:29

Fangming

25.4k7 gold badges105 silver badges96 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Fangming Over a year ago

@e.k Updated my answer. Your JSON is not correctly formatted. Correct it and let me know so that I can give you code to parse your JSON

e.k Over a year ago

My response in very big I just put a small part from it

Fangming Over a year ago

@e.k Updated my answer

e.k Over a year ago

Yeah thank you very much. It helped now I can able to get arrays.

Collectives™ on Stack Overflow

How to parse json response swift3?

1 Answer 1

4 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Linked

Related