JSON path extractor to count the no of keys - regex

Question

I am having sample json
[
: {
: : "id":"255",
: : "name”:”abc”,
: },
: {
: : "id":"257",
: : "name”:”xyz”,
: }
]
I am using json path extractor in jmeter to get the values of id and name.
However is it possible to get the count of ids or names in a straight forward way.
I know if I use regex extractor and using for loop to get the count.

Answer 1

Use regular expression extractor and set no. of match to a negative no. then reference name_matchNr variable should give you the count of occurances of string.
like,
Then expression_matchNr variable should give you the count of id occurances.
For additional reference see JMeter help,Regular Expression extractor

Answer 2

It is possible via some scripting.
For example, if you have the following JSON payload:
{"employees":[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter", "lastName":"Jones"}
]}
And the following JSONPath Expression:
$.employees..firstName
which returns first names as follows:
["John","Anna","Peter"]
You can get matches number by counting commas in the resulting variable.
Given that you're using "name" as the Variable Name in JSON Path Extractor
Add the a Beanshell PostProcessor below JSONPath extractor
Put the following code into the PostProcessor's "Script" area:
int matches = vars.get("name").split(",").length;
vars.put("matches",String.valueOf(matches));
Optionally add a Debug Sampler and a View Results Tree Listener and run your test
You should have "matches" variable containing "3"
For more information on Beanshell scripting in Apache JMeter see How to use BeanShell: JMeter's favorite built-in component guide.

Answer 3

There is a way to do it using Json Extractor as well. For your given Json you can add a Json Extractor in your HTTP Sampler and a Debug Sampler(to see result) next to you HTTP sampler as shown below
and set variable and path expression as follow
See response data of debug sampler and you will get result at last
idCount_matchNr=2