The JSON datatype supports writing JSON to Strings or Writers.

Writing to a String:

import static org.eximeebpms.spin.Spin.JSON;

SpinJsonNode jsonNode = JSON("{\"customer\": \"Kermit\"}");

String json = jsonNode.toString();

Writing to a Writer

import static org.eximeebpms.spin.Spin.JSON;

SpinJsonNode jsonNode = JSON("{\"customer\": \"Kermit\"}");

StringWriter writer = new StringWriter();
jsonNode.writeToWriter(writer);