How to verify what datatype the response is

Example if i have response like this:
“id”: 11,
“name”: “Brenda”,
“username”: “brenda21”,
“email”: “

And I want to verify if the id data-type is integer and name data-type is String.

Is there any keyword or script I can use to check that?

You can use JSON Schema technology for verifying JSON instances against schema. For example, see

However, this would require seasoned skill of programming — not very easy.

The simplest but non-extensible example:

import groovy.json.JsonSlurper

def json = """
"id": 11,
"name": "Brenda",
"username": "brenda21",
"email": ""

JsonSlurper slurper = new JsonSlurper()
def obj = slurper.parseText(json)

assert obj['id'] instanceof Integer

assert obj['name'] instanceof String

Verification using JSON Schema is much more extensible.