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I tried to attempt in many ways, e.g.

if(val["definitions"]["properties"]["Count"]["type"][0] == "number" and 
(val["definitions"]["properties"]["Count"]["type"][1] == "null"))
    //code here
This leads to the following error
  
error : terminate called after throwing an instance of 'Json::LogicError' what(): in Json::Value::operator: requires arrayValue Aborted (core dumped)
And for this piece of code
if (val["definitions"]["properties"]["Count"]["type"][0].isMember("number") and 
(val["definitions"]["properties"]["Count"]["type"][0].isMember("null"))){
    //code here
I get
  
error: terminate called after throwing an instance of 'Json::LogicError'
  what(): in Json::Value::find(key, end, found): requires objectValue or nullValue Aborted (core dumped)
                Count is written using an uppercase C in your JSON and lowercase c in your code - is that intentional?
– UnholySheep
                Jan 11, 2018 at 7:55
You code is right... your json is wrong... JsonCpp needs the quotes for "definitions" and you can't have extra commas after the last item in an array or object.
just change it to:
    "definitions": {
        "properties": {
            "Count": {
                "type": [
                    "number",
                    "null"
                Actually the JSON code presented here is part of some valid JSON schema (DMTF Redfish schemas). The issue is with code itself.
– Sundeep Kumar Gorantla
                Jan 11, 2018 at 8:39
                Change the JSON, try it by yourself... remove the commas and put quotes. It will start to work.
– Wagner Patriota
                Jan 11, 2018 at 15:47
                That is what I dont understand...everything seems correct....but it was showing the error.
– Sundeep Kumar Gorantla
                Jan 11, 2018 at 15:49
 const Json::Value obj=val["definitions"]["properties"]["count"]["type"];
    if (std::find(obj.begin(),obj.end(),"string")!=obj.end() and 
 std::find(obj.begin(),obj.end(),"null")!=obj.end()){
    // code here;
        
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