Check for null values in request body using Wiremock

In the WireMock documentation on Request Matching the section on JSON Path matching. In the source code there is a reference to com.jayway.jsonpath.JsonPath library used. The build.gradle refers to version 2.4.0. The documentation for the Jayway JSON Path library can be found on their Github project page. There is a good, but by no means perfect online evaluator here.

The WireMock documentation only shows support for Regular Expression for the node values in the form of the "matchesJsonPath". In the Jayway documenatation there is an online example: $..book[?(@.author =~ /.*REES/i)]. For this reason the only approach is to name all the nodes that are not allowed to be null.

In the below example mapping all the mentioned nodes will be tested, regardless of their depth (see @id). This mapping will not trigger if all the mentioned nodes are not null, but some unmentioned ones are.

{
  "request": {
    "urlPattern": "/sample-api",
    "method": "GET",
    "bodyPatterns" : [ {
      "matchesJsonPath" : "$..[?(@.cat == null || @.dog == null || @.horse == null || @.fish == null || @.id == null)]"
    } ] 
  },
  "response": {
    "status": "400",
    "headers": {
      "Content-Type": "application/json; charset=utf-8"
    },
    "jsonBody": {
      "message": "some sapi message"
    }
  }
}