count members with jsonpath?

Question

Is it possible to count the number of members using JsonPath?

Using spring mvc test I\'m testing a controller that generates

{\"foo\": \"oof\", \"ba         


        

Answer 1

Been dealing with this myself today. It doesn't seem like this is implemented in the available assertions. However, there is a method to pass in an org.hamcrest.Matcher object. With that you can do something like the following:

final int count = 4; // expected count

jsonPath("$").value(new BaseMatcher() {
    @Override
    public boolean matches(Object obj) {
        return obj instanceof JSONObject && ((JSONObject) obj).size() == count;
    }

    @Override
    public void describeTo(Description description) {
        // nothing for now
    }
})