how to parse json into struct in swift

Question

I have struct like this:

struct Company {

    let name:String
    let id:Int
}

I want to parse from JSON a set of Companies.

Can you please help me how can I do that in Swift?

You can use SwiftyJSON, https://github.com/SwiftyJSON/SwiftyJSON — vzamanillo, Dec 11 '14 at 11:25

score 1 · Answer 1 · answered Jul 29 '18 at 14:23

This is for future folks. In Swift 4 there is a very nice solution with JSONDecoder.

With Alamofire code will look like this -

Alamofire.request(Router.login(parameters: parameters)).responseJSON {
        response in
        switch response.result{
        case .success(_):
            let decoder = JSONDecoder()
            guard let _ = response.data else{
                return
            }
            do {
                let loginDetails = try decoder.decode(LoginDetails.self, from: response.data!)
                // get your details from LoginDetails struct
            } catch let err{
                print(err)
            }


        case .failure(let error):
            print(error)
        }
    }

https://developer.apple.com/documentation/foundation/jsondecoder

https://medium.com/xcblog/painless-json-parsing-with-swift-codable-2c0beaeb21c1

Hope this helps!!!

`guard let _ ` is very bad syntax if you actually need the bound variable later. — vadian, Jul 29 '18 at 14:28
I think the point here is how to decode a JSON to a struct. You can unwrap the optional whichever way you want. — Kanishk Gupta, Jul 29 '18 at 16:29

score 0 · Answer 2 · edited May 23 '17 at 11:52

0

Unfortunately JSON parsing is not very easy in swift. You should use the NSJSONSerialization class to do it.

There are plenty of examples here to look at.

edited May 23 '17 at 11:52

Community

1
1

answered Dec 11 '14 at 11:20

Lars Christoffersen

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score 0 · Answer 3 · answered Dec 02 '16 at 03:47

In Swift3, It's possible to convert dictionary direct to struct use MappingAce

struct Company: Mapping {
    let name:String
    let id:Int
}

let companyInfo: [String : Any] = ["name" : "MappingAce", "id" : 1]

let company = Company(fromDic: companyInfo)
print(company.name)//"MappingAce"
print(company.id)  // 1

how to parse json into struct in swift

3 Answers3