diff --git a/src/main/java/com/wizzardo/http/framework/parameters/ParametersHelper.java b/src/main/java/com/wizzardo/http/framework/parameters/ParametersHelper.java
index 3fb8c61..6d92178 100644
--- a/src/main/java/com/wizzardo/http/framework/parameters/ParametersHelper.java
+++ b/src/main/java/com/wizzardo/http/framework/parameters/ParametersHelper.java
@@ -380,6 +380,13 @@ protected static Mapper<Request, Object> createPojoMapper(Class type, String par
             if (request.data() != null && contentType != null && contentType.toLowerCase().startsWith(Header.VALUE_APPLICATION_JSON.value))
                 return JsonTools.parse(request.data(), type);
 
+            if (request.isMultipart()) {
+                MultiPartEntry entry = request.entry(parameterName);
+                if (entry != null && entry.contentType().toLowerCase().startsWith(Header.VALUE_APPLICATION_JSON.value)) {
+                    return JsonTools.parse(entry.asBytes(), type);
+                }
+            }
+
             ParameterMapper<?> m = customMappers.get(type);
             if (m != null) {
                 Object[] ref = new Object[1];
diff --git a/src/main/java/com/wizzardo/http/request/MultiPartEntry.java b/src/main/java/com/wizzardo/http/request/MultiPartEntry.java
index c231a21..dbe520e 100644
--- a/src/main/java/com/wizzardo/http/request/MultiPartEntry.java
+++ b/src/main/java/com/wizzardo/http/request/MultiPartEntry.java
@@ -60,4 +60,12 @@ public String asString() {
     public abstract InputStream inputStream() throws IOException;
 
     public abstract OutputStream outputStream() throws IOException;
+
+    @Override
+    public String toString() {
+        return "MultiPartEntry{" +
+                "name='" + name + '\'' +
+                ", headers=" + headers +
+                '}';
+    }
 }
diff --git a/src/test/java/com/wizzardo/http/framework/ControllerHandlerTest.java b/src/test/java/com/wizzardo/http/framework/ControllerHandlerTest.java
index a58b3ef..88a33c3 100644
--- a/src/test/java/com/wizzardo/http/framework/ControllerHandlerTest.java
+++ b/src/test/java/com/wizzardo/http/framework/ControllerHandlerTest.java
@@ -7,12 +7,15 @@
 import com.wizzardo.http.framework.parameters.ParametersHelper;
 import com.wizzardo.http.framework.template.Model;
 import com.wizzardo.http.framework.template.Renderer;
+import com.wizzardo.http.request.Request;
 import com.wizzardo.tools.evaluation.Config;
+import com.wizzardo.tools.http.ContentType;
 import com.wizzardo.tools.io.FileTools;
 import com.wizzardo.tools.json.JsonTools;
 import com.wizzardo.tools.misc.With;
 import com.wizzardo.tools.reflection.FieldReflectionFactory;
 import com.wizzardo.tools.reflection.UnsafeTools;
+import com.wizzardo.tools.security.MD5;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -1133,4 +1136,41 @@ public void test_custom_types() throws IOException {
         checkException(() -> server.getUrlMapping().append("/integer", CustomTypesController.class, "integer"), IllegalStateException.class, "Cannot create renderer for int");
         checkException(() -> server.getUrlMapping().append("/character", CustomTypesController.class, "character"), IllegalStateException.class, "Cannot create renderer for class java.lang.Character");
     }
+
+
+    public static class TestMultipartController extends Controller {
+
+        public static class TestDataInfo {
+            String name;
+        }
+
+        public String test(
+                @Parameter(name = "data") byte[] data,
+                @Parameter(name = "info") TestDataInfo info
+        ) {
+            return info.name + ":" + MD5.create().update(data).asString();
+        }
+    }
+
+    @Test
+    public void testJsonAndBinaryParams() throws IOException {
+        byte[] data = new byte[10 * 1024 * 1024];
+        new Random().nextBytes(data);
+        final String md5 = MD5.create().update(data).asString();
+
+        server.getUrlMapping()
+                .append("/", TestMultipartController.class, "test", Request.Method.POST);
+
+        String name = "test-name";
+
+        TestMultipartController.TestDataInfo testDataInfo = new TestMultipartController.TestDataInfo();
+        testDataInfo.name = name;
+
+        String responseString = makeRequest("/")
+                .addByteArray("info", JsonTools.serializeToBytes(testDataInfo), "info", ContentType.JSON.value)
+                .addByteArray("data", data, "just some data")
+                .post().asString();
+
+        Assert.assertEquals(name + ":" + md5, responseString);
+    }
 }