How to iterate through the contents of a Json object - jmeter

Question

On the JSR223 assertion in Jmeter, I need to validate only the inner part of the JSON returned.
I followed this thread to get an idea on the validation.
​How can I write JSON schema validation for JMeter run in TeamCity
Basically my Jmeter sampler returns the json as follows. On my schema, the validation should be for items, service and requestId. No validation should be performed for "payload".
{
"payload": [
{
"items": [
{
"code": "487482378",
"description": "Alpha Co",
"valid": true
},
{
"code": "92901128365",
"description": "Beta Co",
"valid": true
}
],
"service": "entities",
"requestId": "d190219"
}
]
}
This is my current code in the js223 sampler:
var schemaPath = '/path/entities-schema.json'
var rawSchema = new org.json.JSONObject(new org.json.JSONTokener(org.apache.commons.io.FileUtils.readFileToString(new java.io.File(schemaPath), 'UTF-8')))
var schema = org.everit.json.schema.loader.SchemaLoader.load(rawSchema)
schema.validate(new org.json.JSONObject(prev.getResponseDataAsString()))

Answer 1

You can remove the "unwanted" part of the response using JSR223 PostProcessor like:
def before = prev.getResponseDataAsString()
log.info('Before: ' + before)
def response = new groovy.json.JsonSlurper().parseText(before)
def after = new groovy.json.JsonBuilder(response.payload.items).toPrettyString()
log.info('After: ' + after)
prev.setResponseData(after, 'UTF-8')
Once done you can use your JSON Schema validation approach against the new content without elements you don't need.
References:
Groovy: Parsing and producing JSON
Apache Groovy - Why and How You Should Use It