How do I create JSON output?

edit

You can do this in a Jython evaluator with json.dumps(). Just be sure to use record.value rather than plain record. You can also pass a field rather than the whole record:

import json

for record in records:
  try:
    # Whole record
    record.value['json'] = json.dumps(record.value)
    # Just a field
    record.value['json_address'] = json.dumps(record.value['address'])
    output.write(record)

  except Exception as e:
    # Send record to error
    error.write(record, str(e))

This results in output like: