diff --git a/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java b/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java
index b7b4556..d9bdf94 100644
--- a/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/NodesListCommand.java
@@ -1,5 +1,8 @@
 package org.onlab.onos.cli;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
 import org.apache.karaf.shell.commands.Command;
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.cluster.ControllerNode;
@@ -24,12 +27,32 @@
         ClusterService service = get(ClusterService.class);
         List<ControllerNode> nodes = newArrayList(service.getNodes());
         Collections.sort(nodes, Comparators.NODE_COMPARATOR);
+        if (outputJson()) {
+            print("%s", json(service, nodes));
+        } else {
+            ControllerNode self = service.getLocalNode();
+            for (ControllerNode node : nodes) {
+                print(FMT, node.id(), node.ip(), node.tcpPort(),
+                      service.getState(node.id()),
+                      node.equals(self) ? "*" : "");
+            }
+        }
+    }
+
+    // Produces JSON structure.
+    private JsonNode json(ClusterService service, List<ControllerNode> nodes) {
+        ObjectMapper mapper = new ObjectMapper();
+        ArrayNode result = mapper.createArrayNode();
         ControllerNode self = service.getLocalNode();
         for (ControllerNode node : nodes) {
-            print(FMT, node.id(), node.ip(), node.tcpPort(),
-                  service.getState(node.id()),
-                  node.equals(self) ? "*" : "");
+            result.add(mapper.createObjectNode()
+                               .put("id", node.id().toString())
+                               .put("ip", node.ip().toString())
+                               .put("tcpPort", node.tcpPort())
+                               .put("state", service.getState(node.id()).toString())
+                               .put("self", node.equals(self)));
         }
+        return result;
     }
 
 }