jsonpath find string value in the jsonarray independent of array index

You can filter the array with the following:

JsonPath.query("$.error[?(@.errorMessage=='Fixed Error Message')]", json)

EDIT 1:

This would be preferred to check if the message was actually found:

jsonPath("$.error[?(@.errorMessage=='Fixed Error Message')]").exists

If you want to do the .is() check you can try the following (not very nice):

jsonPath("$.error[?(@.errorMessage=='Fixed Error Message')].errorMessage").is("Fixed Error Message")

CodeHunter