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Editorial Team
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Asked: 2026-05-28T07:04:59+00:00

I’m using the json.org library to parse my json. But I have a field

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I’m using the json.org library to parse my json. But I have a field called “messages” that depending on the number of messages may come as a null field, a JSONObject (if there is only one message) or a JSONArray if there are multiple messages. I’m having some trouble to treat this because I have to read it using the correct object type as it will return an error if i don’t make it right. Oh, and it’s java.

Can anyone help me? I’m sure there is a “standart” way to treat this!

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1 Answer

  1. Editorial Team

    Assuming you’re using JSONTokener:

    JSONTokener jk = ...; // whatever you're currently doing.

// Probably a loop here around the below...

Object o = jk.nextValue();
if(o instanceof JSONObject){
  JSONObject jo = (JSONObject)o;
  // Do something with jo.
}else if(o instanceof JSONArray){
  JSONArray ja = (JSONArray)o;
  // Do something with ja.
}else{
  // Is null or another type.  (Maybe do something?)
}

    See http://www.json.org/javadoc/org/json/JSONTokener.html#nextValue%28%29 for all the other types that can be returned from nextValue().

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