There is no magic solution for those scenarios and no one solution fits all out of Nifi that I can think of. You have to understand the nature of the input before you start consuming it and you have to provide the solution catered to this input. Sometimes if you are lucky you can combine multiple scenarios into one flow but that still depends on the complexity of the input. Even thought in your first scenario the second option I proposed seem to be simple enough and it did the job, for your second example its more complex and I dont think the out of the box GrokReader will be able to handle such complexity, therefore the first option of using the ExtractText Processor will work better because you can customize your regex as needed. For example, based on the text you provided:       JohnCena32 Male New York USA813668       I can use the following regex:       [A-Z][a-z]+[A-Z][a-z]+\d+\s(?:Male|Female|M|F)\s[A-Z][a-z]+(?:\s[A-Z][a-z]+)?\s[A-Za-z]+\d+       In the ExtractText processor I will define a dynamic property for each attribute (city, age, firstname...etc.) and surround the segment of the pattern that corresponds to the value with a parenthesis to extract as matching group. For Example: Age: [A-Z][a-z]+[A-Z][a-z]+(\d+)\s(?:Male|Female|M|F)\s[A-Z][a-z]+(?:\s[A-Z][a-z]+)?\s[A-Za-z]+\d+ FirstName: ([A-Z][a-z]+)[A-Z][a-z]+\d+\s(?:Male|Female|M|F)\s[A-Z][a-z]+(?:\s[A-Z][a-z]+)?\s[A-Za-z]+\d+ Gender: [A-Z][a-z]+[A-Z][a-z]+\d+\s((?:Male|Female|M|F))\s[A-Z][a-z]+(?:\s[A-Z][a-z]+)?\s[A-Za-z]+\d+ Country: [A-Z][a-z]+[A-Z][a-z]+\d+\s(?:Male|Female|M|F)\s[A-Z][a-z]+(?:\s[A-Z][a-z]+)?\s([A-Za-z]+)\d+ And so on... This should give you the attribute you need. Then you can use the AttributeToJson processor to get the json output and finally if you want to convert the data to the proper type you can either user JoltTransformation  or QueryRecord with cast as shown above. One final note: If you know how to use some external libraries in python for example or groovy or any of the supported code script in the ExecuteScript processor then you can use that to write your custom code to create the required fllowfile\attributes that will help you downstream to generate the final output. If that helps please accept solution. Thanks   ... View more