How to assert a JSON Array with 100+ values for its key names

Hey, You can write groovy code for JsonPath parser and verify the results. Follow this line of code:-

This is your JSON:- 

{
"apiVersion": "0.1",
"errors": null,
"infos": null,

}

Get the path of each and every key whichever you wan to assert and then verify the results:-

def response = '''

{
"apiVersion": "0.1",
"errors": null,
"infos": null

}'''

def slurper = new JsonSlurper();
def inputdata= slurper.parseText(response)

def finalValueToRead = "$.apiVersion"
def actualValue = parse(inputdata).read(strFinalValueToRead).toString()

actualValue will print 0.1 .. Similarly you do for others also. Better way is create a keyword names as "Check_Value_Present" and call it every time for the path verification.. That's all.