diff --git a/broker/adapter/natsstream/output.go b/broker/adapter/natsstream/output.go
index 5af12c264..b724918ec 100644
--- a/broker/adapter/natsstream/output.go
+++ b/broker/adapter/natsstream/output.go
@@ -31,9 +31,10 @@ type stream struct {
 }
 
 type msg struct {
-	Message string    `json:"data"`
-	Sender  string    `json:"sender"`
-	Time    time.Time `json:"time"`
+	Protocol string    `json:"protocol"`
+	Data     string    `json:"data"`
+	Sender   string    `json:"sender"`
+	Time     time.Time `json:"time"`
 }
 
 func newStream(name string, work chan adaptable, logger *log.Entry) ([]*stream, error) {
@@ -141,9 +142,10 @@ func (sc *stream) publisher(ctx context.Context, wg *sync.WaitGroup) {
 		defer obs.ObserveDuration()
 
 		m := msg{
-			Message: r.Message(),
-			Sender:  r.SenderID(),
-			Time:    r.Time().UTC(),
+			Protocol: "choria:adapters:natsstream:output:1",
+			Data:     r.Message(),
+			Sender:   r.SenderID(),
+			Time:     r.Time().UTC(),
 		}
 
 		j, err := json.Marshal(m)
diff --git a/schemas/choria:adapters:natsstream:output:1.json b/schemas/choria:adapters:natsstream:output:1.json
new file mode 100644
index 000000000..7b70aeb92
--- /dev/null
+++ b/schemas/choria:adapters:natsstream:output:1.json
@@ -0,0 +1,32 @@
+{
+    "$schema": "http://json-schema.org/draft-04/schema",
+    "description": "Data generated by the NATS Stream Data Adapter",
+    "title": "choria:adapters:natsstream:output:1",
+    "type":"object",
+    "required":[
+        "protocol",
+        "data",
+        "sender",
+        "time"
+    ],
+    "properties": {
+        "protocol": {
+             "type":"string",
+             "enum": [
+                 "choria:adapters:natsstream:output:1"
+             ]
+         },
+         "data": {
+             "type":"string",
+             "description": "The unmodified content of the message received from NATS"
+         },
+         "sender": {
+             "type":"string",
+             "description": "The Sender ID who produced the NATS message"
+         },
+         "time": {
+             "type":"integer",
+             "description": "Unix time the message was converted in UTC time zone"
+         }
+    }
+}
\ No newline at end of file