Alamofire can't access keys of json response

Question

I'm new to using Alamofire and have encountered an issue. I'm able to run the following code to print out all the data from an API endpoint.

Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
    if let JSON = response.result.value {
        print(JSON)
    }
}

The issue is that when I run this:

Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
    if let JSON = response.result.value {
        print(JSON["firstkey"])
    }
}

I get the error:

Type 'Any' has no subscript members

I don't know why this error is happening, it seems as if I'm accessing the data correctly. Any help would be great, thanks!

I have tried formatting it using both:

print(JSON["firstkey"] as String)

and

print(JSON["firstkey"] as [String:Any]

but they still give the same error.

This is the JSON on my endpoint:

{
    "firstkey":"it worked!",
    "secondkey":["item1", "item2", "item3"]
}

"Type 'Any' has no subscript members": Know error. Did you search for it? `JSON`/`response.result.value` is of type `Any`, it's not a Dictionary, so you can use subscript (which you do by doing `["firstKey"]` on it). You have to specify that i's a dictionary, by doing something like `as [String:Any]` — Larme, Jun 04 '17 at 21:37
Possible duplicate of [Correctly Parsing JSON in Swift 3](https://stackoverflow.com/questions/39423367/correctly-parsing-json-in-swift-3) — Larme, Jun 04 '17 at 21:38
@Larme I've searched for the error and have tried doing `print(JSON["firstkey"] as String)` and `print(JSON["firstkey"] as [String:Any]` both give the same error `Tyep 'Any' has no subscript members` — Joe Scotto, Jun 04 '17 at 21:39
(I'll bypass the `print` ): `JSON["firstkey"] as [String:Any])` => It's saying: Consider `JSON["firstkey"]` as a Dictionary object (which keys are String), not Consider `JSON` as a Dictionary object (which keys are String). That's different. — Larme, Jun 04 '17 at 21:41
@Larme I'm sorry, but that's not making much sense to me. I'm fairly new to Swift, I know most of the basics but making API calls using it is very new to me. Could you give me more information as to what I actually have to do to just be able to call `json["firstkey"]` and get the value? — Joe Scotto, Jun 04 '17 at 21:43

Arash Tabrizian · Accepted Answer · 2017-06-04T22:40:42.897

1

This is really simple. You just need to force cast (as!) your JSON. so change your code to this and it will work:

Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
    if let JSON = response.result.value {
        let json = JSON as! [String: Any]
        print(json["firstkey"])
    }
}

Edit 1: As you said in comments that you are using SwiftyJSON package. Sample code is as follows:

Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
        if let value = response.result.value {
            let json = JSON(value)
            print(json["firstkey"].stringValue)
        }
    }

Alamofire.request("https://mmcalc.com/api").responseJSON { response in
        if let value = response.result.value {
            let json = JSON(value)
            print(json.arrayValue[0]["uniqueUsers"].stringValue)
        }
    }

edited Jun 04 '17 at 22:40

answered Jun 04 '17 at 22:24

Arash Tabrizian

146
7

That seems to be working but only partially. I'm now trying another [api](https://mmcalc.com/api) and I'm unable to access keys because of indexing. Is there a way I can just parse this and get a simple object where I can go `json[0]["key"]`? – Joe Scotto Jun 04 '17 at 22:27
I recommend you use [SwiftyJson](https://github.com/SwiftyJSON/SwiftyJSON) to parse your json into a JSON object. It makes your job way easier. If you do not use a json parser like SwiftyJSON, you have to find the correct format for each and every api that you consume. – Arash Tabrizian Jun 04 '17 at 22:30
I'm using SwiftyJson in my project, would it be simple to do this? Could you provide an example? – Joe Scotto Jun 04 '17 at 22:31
Thank you, I appreciate it very much! – Joe Scotto Jun 04 '17 at 22:39
You're welcome and do not forget to import SwiftyJSON at top of your file. – Arash Tabrizian Jun 04 '17 at 22:42

score 0 · Answer 2 · answered Jun 04 '17 at 22:29

You are trying to get the value with getting the object, try this:

Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
if let result = response.result.value {
    let JSON = result as! NSDictionary
    print(JSON["firstkey"])
}
}

Hope it will work!

Swym App · Answer 3 · 2019-06-28T09:53:14.933

0

You should add ! at the end of code before ) to force unwrap the value

   Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in
      if let JSON = response.result.value {
      let json = JSON as! [String: Any]
      print(json["firstkey"]!)
   }
}

edited Jun 28 '19 at 09:53

answered Jun 28 '19 at 09:47

Swym App

1
1

We can also use this code Alamofire.request("http://codewithchris.com/code/afsample.json").responseJSON { response in if let JSON = response.result.value { let json = JSON as! [String: Any] print(json["firstkey"] as Any) } } – Swym App Jun 28 '19 at 09:53

Alamofire can't access keys of json response

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