This is one the most common types of Message Responders.
You can create a JSON Message Responder tool directly from the Add Responder wizards. This responder is preconfigured as follows:
|Resource Mode||No Service Definition|
|Response tab view||Form JSON|
Form JSON input mode allows you to define and parameterize JSON payloads via a graphical interface (as described in Form JSON View Options).
All of the available configuration options for this type of message responder are covered in Message Responder Overview.
For tips on virtualizing JSON services, see Using JSON.