Groovy: validate JSON string

Question

I need to check that a string is valid JSON in Groovy. My first thought was just to send it through new JsonSlurper().parseText(myString) and, if there was no exce

Answer 1

can validate like this:

assert JsonOutput.toJson(new JsonSlurper().parseText(myString)).replaceAll("\\s", "") ==
            myString.replaceAll("\\s", "")

or a bit cleaner:

String.metaClass.isJson << { ->
    def normalize = { it.replaceAll("\\s", "") }

    try {
        normalize(delegate) == normalize(JsonOutput.toJson(new JsonSlurper().parseText(delegate)))
    } catch (e) {
        false
    }
}

assert '{"key":"value"}'.isJson()
assert !''.isJson()