Extracting JSON key and values to separated fields

Elastic Stack Logstash
2

Solved.

filter {
    json {
        source => "message"
        target => "json"
    }
    if "_jsonparsefailure" not in [tags]  {
        ruby {
            code => "
                json_data = event.get('[json]')
                event.set('url', json_data.keys[0])
                event.set('parameters', json_data[json_data.keys[0]])
            "
        }
        mutate { 
            remove_field => ["message"] 
            remove_field => ["json"] 
        }
    }
}

This can help.