diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ClusterApiServlet.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ClusterApiServlet.java
index 3f065ee..165c104 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ClusterApiServlet.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ClusterApiServlet.java
@@ -80,7 +80,7 @@
                 default:
                     throw new IllegalArgumentException();
             }
-            responseWriter.write(JSONUtil.convertNode(json));
+            JSONUtil.writeNode(responseWriter, json);
         } catch (IllegalArgumentException e) { // NOSONAR - exception not logged or rethrown
             response.setStatus(HttpResponseStatus.NOT_FOUND);
         } catch (Exception e) {
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/DiagnosticsApiServlet.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/DiagnosticsApiServlet.java
index 3c58f30..3fe591f 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/DiagnosticsApiServlet.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/DiagnosticsApiServlet.java
@@ -67,7 +67,7 @@
             if (!"".equals(localPath(request))) {
                 throw new IllegalArgumentException();
             }
-            responseWriter.write(JSONUtil.convertNode(getClusterDiagnosticsJSON()));
+            JSONUtil.writeNode(responseWriter, getClusterDiagnosticsJSON());
         } catch (IllegalStateException e) { // NOSONAR - exception not logged or rethrown
             response.setStatus(HttpResponseStatus.SERVICE_UNAVAILABLE);
         } catch (IllegalArgumentException e) { // NOSONAR - exception not logged or rethrown
diff --git a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ShutdownApiServlet.java b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ShutdownApiServlet.java
index 1731697..ddd0f1f 100644
--- a/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ShutdownApiServlet.java
+++ b/asterixdb/asterix-app/src/main/java/org/apache/asterix/api/http/server/ShutdownApiServlet.java
@@ -94,7 +94,7 @@
             }
             jsonObject.set("cluster", clusterState);
             final PrintWriter writer = response.writer();
-            writer.print(JSONUtil.convertNode(jsonObject));
+            JSONUtil.writeNode(writer, jsonObject);
             // accept no further queries once this servlet returns
             csm.setState(SHUTTING_DOWN);
             writer.close();
diff --git a/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/JSONUtil.java b/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/JSONUtil.java
index 51855c6..dcdf140 100644
--- a/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/JSONUtil.java
+++ b/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/JSONUtil.java
@@ -19,6 +19,7 @@
 package org.apache.hyracks.util;
 
 import java.io.IOException;
+import java.io.Writer;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -28,6 +29,7 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.MapperFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectWriter;
 import com.fasterxml.jackson.databind.SerializationFeature;
 
 public class JSONUtil {
@@ -37,6 +39,7 @@
     private static final String INDENT = "\t";
 
     private static final ObjectMapper SORTED_MAPPER = new ObjectMapper();
+    private static final ObjectWriter PRETTY_SORTED_WRITER;
 
     private JSONUtil() {
     }
@@ -44,11 +47,15 @@
     static {
         SORTED_MAPPER.configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true);
         SORTED_MAPPER.configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true);
+        PRETTY_SORTED_WRITER = SORTED_MAPPER.writerWithDefaultPrettyPrinter();
     }
 
     public static String convertNode(final JsonNode node) throws JsonProcessingException {
-        final Object obj = SORTED_MAPPER.treeToValue(node, Object.class);
-        return SORTED_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
+        return PRETTY_SORTED_WRITER.writeValueAsString(SORTED_MAPPER.treeToValue(node, Object.class));
+    }
+
+    public static void writeNode(final Writer writer, final JsonNode node) throws IOException {
+        PRETTY_SORTED_WRITER.writeValue(writer, SORTED_MAPPER.treeToValue(node, Object.class));
     }
 
     public static String indent(String str, int initialIndent) {