Hi Jim, You should just be able to catch the Exception.
['3.5', '3.5.5', '['].each { try { new JsonSlurper().parseText(it) println 'Valid' } catch(error) { println "Invalid: $error.message" } } There are some more examples in the unit tests, e.g.: https://github.com/apache/groovy/blob/master/subprojects/groovy-json/src/test/groovy/groovy/json/JsonSlurperTest.groovy#L260-L265 Cheers, Paul. On Tue, Sep 21, 2021 at 8:35 PM James McMahon <jsmcmah...@gmail.com> wrote: > Hello. Newbie to Groovy. Have a text string that I need to verify is a > representation of valid JSON, or not. What is an effective means to do this > in Groovy? I'm having difficulty determining what a method like JSONSlurper > will return to me if the string can't be parsed because it is not valid > JSON? I've found plenty of examples of results it returns when it works, > but nothing yet showing me what it returns when the string isn't valid > JSON. > Hope this is a valid way to post such a question. As I said, this is my > first time trying this or any Groovy forum. Thanks in advance for any help. > -Jim > >