diff --git a/blackbox-test/src/main/java/org/example/customer/node/HelloWithUnmapped.java b/blackbox-test/src/main/java/org/example/customer/node/HelloWithUnmapped.java
new file mode 100644
index 00000000..a096b7b0
--- /dev/null
+++ b/blackbox-test/src/main/java/org/example/customer/node/HelloWithUnmapped.java
@@ -0,0 +1,12 @@
+package org.example.customer.node;
+
+import io.avaje.json.node.JsonObject;
+import io.avaje.jsonb.Json;
+
+@Json
+public record HelloWithUnmapped(
+  String name,
+  int count,
+  @Json.Unmapped
+  JsonObject other) {
+}
diff --git a/blackbox-test/src/test/java/org/example/customer/node/HelloWithUnmappedTest.java b/blackbox-test/src/test/java/org/example/customer/node/HelloWithUnmappedTest.java
new file mode 100644
index 00000000..aecbd3f8
--- /dev/null
+++ b/blackbox-test/src/test/java/org/example/customer/node/HelloWithUnmappedTest.java
@@ -0,0 +1,25 @@
+package org.example.customer.node;
+
+import io.avaje.json.node.JsonObject;
+import io.avaje.jsonb.JsonType;
+import io.avaje.jsonb.Jsonb;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HelloWithUnmappedTest {
+
+  Jsonb jsonb = Jsonb.builder().build();
+  JsonType<HelloWithUnmapped> jsonType = jsonb.type(HelloWithUnmapped.class);
+
+  @Test
+  void test() {
+    var source = new HelloWithUnmapped("hi", 3, JsonObject.create().add("extra", "b").add("extra2", 54L));
+
+    String asJson = jsonType.toJson(source);
+    assertThat(asJson).isEqualTo("{\"name\":\"hi\",\"count\":3,\"extra\":\"b\",\"extra2\":54}");
+
+    HelloWithUnmapped fromJson = jsonType.fromJson(asJson);
+    assertThat(fromJson).isEqualTo(source);
+  }
+}
diff --git a/jsonb-generator/src/main/java/io/avaje/jsonb/generator/ClassReader.java b/jsonb-generator/src/main/java/io/avaje/jsonb/generator/ClassReader.java
index 9a093ef7..d0818d74 100644
--- a/jsonb-generator/src/main/java/io/avaje/jsonb/generator/ClassReader.java
+++ b/jsonb-generator/src/main/java/io/avaje/jsonb/generator/ClassReader.java
@@ -462,7 +462,11 @@ private void writeFromJsonImplementation(Append writer, String varName) {
       writer.eol().append("    String type = null;").eol();
     }
     if (unmappedField != null) {
-      writer.append("    Map<String, Object> unmapped = new LinkedHashMap<>();").eol();
+      if (unmappedJsonNodeType()) {
+        writer.append("    var unmapped = io.avaje.json.node.JsonObject.create();").eol();
+      } else {
+        writer.append("    var unmapped = new java.util.LinkedHashMap<String, Object>();").eol();
+      }
     }
     writeFromJsonSwitch(writer, directLoad, varName);
     writer.eol();
@@ -480,6 +484,10 @@ private void writeFromJsonImplementation(Append writer, String varName) {
     writer.append("  }").eol();
   }
 
+  private boolean unmappedJsonNodeType() {
+    return unmappedField.type().topType().startsWith("io.avaje.json.node.");
+  }
+
   private void writeJsonBuildResult(Append writer, String varName) {
     writer.append("    // build and return %s", shortName).eol();
     if (constructor == null) {
@@ -618,8 +626,13 @@ private void writeFromJsonSwitch(Append writer, boolean defaultConstructor, Stri
     writer.append("        default:").eol();
     final String unmappedFieldName = caseInsensitiveKeys ? "origFieldName" : "fieldName";
     if (unmappedField != null) {
-      writer.append("          Object value = objectJsonAdapter.fromJson(reader);").eol();
-      writer.append("          unmapped.put(%s, value);", unmappedFieldName).eol();
+      if (unmappedJsonNodeType()) {
+        writer.append("          var value = jsonNodeAdapter.fromJson(reader);").eol();
+        writer.append("          unmapped.add(%s, value);", unmappedFieldName).eol();
+      } else {
+        writer.append("          var value = objectJsonAdapter.fromJson(reader);").eol();
+        writer.append("          unmapped.put(%s, value);", unmappedFieldName).eol();
+      }
     } else {
       writer.append("          reader.unmappedField(%s);", unmappedFieldName).eol();
       writer.append("          reader.skipValue();").eol();
diff --git a/jsonb-generator/src/main/java/io/avaje/jsonb/generator/FieldProperty.java b/jsonb-generator/src/main/java/io/avaje/jsonb/generator/FieldProperty.java
index a81586c8..bc6b4ed8 100644
--- a/jsonb-generator/src/main/java/io/avaje/jsonb/generator/FieldProperty.java
+++ b/jsonb-generator/src/main/java/io/avaje/jsonb/generator/FieldProperty.java
@@ -62,9 +62,15 @@ final class FieldProperty {
       adapterFieldName = "rawAdapter";
       defaultValue = "null";
     } else if (unmapped) {
-      genericType = GenericType.parse("java.lang.Object");
-      adapterShortType = "JsonAdapter<Object>";
-      adapterFieldName = "objectJsonAdapter";
+      if (unmappedJsonObject()) {
+        genericType = GenericType.parse("io.avaje.json.node.JsonNode");
+        adapterShortType = "JsonAdapter<JsonNode>";
+        adapterFieldName = "jsonNodeAdapter";
+      } else {
+        genericType = GenericType.parse("java.lang.Object");
+        adapterShortType = "JsonAdapter<Object>";
+        adapterFieldName = "objectJsonAdapter";
+      }
       defaultValue = "null";
     } else {
       genericType = GenericType.parse(rawType);
@@ -80,6 +86,10 @@ final class FieldProperty {
     }
   }
 
+  private boolean unmappedJsonObject() {
+    return rawType.startsWith("io.avaje.json.node");
+  }
+
   void setConstructorParam() {
     constructorParam = true;
   }
@@ -180,9 +190,9 @@ private boolean nameHasIsPrefix() {
   }
 
   void addImports(Set<String> importTypes) {
-    customSerializer.ifPresent(t -> importTypes.add(t.toString()));
-    if (unmapped) {
-      importTypes.add("java.util.*");
+    customSerializer.ifPresent(importTypes::add);
+    if (unmapped && unmappedJsonObject()) {
+      importTypes.add("io.avaje.json.node.JsonNode");
     }
     if (!raw) {
       genericType.addImports(importTypes);
@@ -232,13 +242,19 @@ private String genericTypeReplacement(String asType, String replaceWith) {
 
   void writeToJson(Append writer, String varName, String prefix) {
     if (unmapped) {
-      writer.append("%sMap<String, Object> unmapped = ", prefix);
+      writer.append("%svar unmapped = ", prefix);
       writeGetValue(writer, varName, ";");
       writer.eol();
       writer.append("%sif (unmapped != null) {", prefix).eol();
-      writer.append("%s for (Map.Entry<String, Object> entry : unmapped.entrySet()) {", prefix).eol();
-      writer.append("%s   writer.name(entry.getKey());", prefix).eol();
-      writer.append("%s   objectJsonAdapter.toJson(writer, entry.getValue());", prefix).eol();
+      if (unmappedJsonObject()) {
+        writer.append("%s for (var entry : unmapped.elements().entrySet()) {", prefix).eol();
+        writer.append("%s   writer.name(entry.getKey());", prefix).eol();
+        writer.append("%s   jsonNodeAdapter.toJson(writer, entry.getValue());", prefix).eol();
+      } else {
+        writer.append("%s for (var entry : unmapped.entrySet()) {", prefix).eol();
+        writer.append("%s   writer.name(entry.getKey());", prefix).eol();
+        writer.append("%s   objectJsonAdapter.toJson(writer, entry.getValue());", prefix).eol();
+      }
       writer.append("%s }", prefix).eol();
       writer.append("%s}", prefix).eol();
     } else {