How to extract json var with Groovy and JMeter

Question

Calling a REST API with JMeter 3.3, I have following JSON response:

{"map":{},"meta":{"code":"123"}}

How can I extract the value of code (123)?

So far I am using this:

Thread Group
HTTP Request
JSON Extractor

with this 2 vars: code; meta and this json path expressions: $.code; $.meta

JSR223 Assertion

with this Groovy code:

String codeString = vars.get("code"); String meta = vars.get("meta"); log.info ("The code answer is " + codeString); if (codeString != "000"){ AssertionResult.setFailureMessage("The code is: " + codeString + " - meta is: " + meta); AssertionResult.setFailure(true); }

this is the assertion result instead:

Assertion error: false Assertion failure: true Assertion failure message: The code is: No_Default - meta is: {"code":"000"}

Szymon Stepniak · Accepted Answer · 2018-02-20 11:55:24Z

You can use JsonSlurper to extract the data you are interested in:

import groovy.json.JsonSlurper String json = prev.getResponseDataAsString() def root = new JsonSlurper().parseText(json) def code = root.meta.code

Dmitri T · Accepted Answer · 2018-02-20 13:40:32Z

Given you use Groovy you don't need the JSON Path Extractor, you can validate your code like:

def code = com.jayway.jsonpath.JsonPath.read(prev.getResponseDataAsString(), '$..code').get(0).toString() if (!code.equals('000')) { AssertionResult.setFailure(true) AssertionResult.setFailureMessage('The code is ' + code) }

More information:

Ori Marko · Accepted Answer · 2018-02-20 11:52:43Z

You have a mistake in JSON path expression $.code for getting code, it's under second hierarchy and therefore you are missing ., use the following:

$..code

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