parsing json object with number as its key fields?

Question

I'm trying to parse json into kotlin objects but the problem is that its key fields are numbers any idea how can parse them , I've tried serialized name but still facing problem.

The json response looks like this :

{
    "Id": [{
            "1": {
                "name": "name1",
                "class": "11a"
            }
        },
        {
            "2": {
                "name": "name2",
                "class": "11b"
            }
        }
    ]
}

I'm using gson and the main thing i'm trying to do is to store this number fields as some other string objects.

What you posted wasn't valid JSON. Changed it to Valid JSON, while still keeping your question the way it is, since it's still a valid question. — Tom Cools
– Tom Cools, Commented Apr 19, 2020 at 9:43

Alexey Soshin · Accepted Answer · 2020-04-19 11:19:49Z

1

You can parse them into a list of maps, then "map" those to your data classes instead:

    val input = """{
    "Id": [{
            "1": {
                "name": "name1",
                "class": "11a"
            }
        },
        {
            "2": {
                "name": "name2",
                "class": "11b"
            }
        }
    ]
}"""

    val gson = Gson()
    val parsed: Map<String, List<Map<String, Any>>> = 
        gson.fromJson(input, (object : TypeToken<Map<String, List<Map<String, Any>>>>(){}).type)
    println(parsed["Id"]?.get(0)?.get("1")) // {name=name1, class=11a}

It will have some nasty generic signature, though.

If you're working with Kotlin, take a look at Klaxon, it will improve your experience.

answered Apr 19, 2020 at 11:19

Alexey Soshin

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3 Comments

Alexey Soshin Over a year ago

There's no countryitems in the JSON you've provided, so my example may not work as-is on your code. Are you getting the error while parsing or while fetching values?

Divyanshu Over a year ago

val parsed: Map<String, List<Map<String, Any>>> =                     gson.fromJson(body, (object : TypeToken<Map<String, List<Map<String, Any>>>>(){}).type)                                                                                                    val parsedvalue: Map<Any, Any> = parsed["id"]?.get(0)?.get("1) as Map<Any, Any>

Divyanshu Over a year ago

thanks this fixed my problem I mapped the data further by storing it into another variable. val parsedvalue in this example.

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