diff --git a/src/main/java/org/dragonet/proxy/commands/defaults/TestCommand.java b/src/main/java/org/dragonet/proxy/commands/defaults/TestCommand.java
index 604c7eaf0..d03c3b6e8 100644
--- a/src/main/java/org/dragonet/proxy/commands/defaults/TestCommand.java
+++ b/src/main/java/org/dragonet/proxy/commands/defaults/TestCommand.java
@@ -2,6 +2,9 @@
 
 import org.dragonet.proxy.DragonProxy;
 import org.dragonet.proxy.commands.Command;
+import org.dragonet.proxy.gui.CustomFormComponent;
+import org.dragonet.proxy.gui.DropDownComponent;
+import org.dragonet.proxy.gui.LabelComponent;
 import org.dragonet.proxy.network.UpstreamSession;
 import org.dragonet.proxy.protocol.packets.*;
 import org.dragonet.proxy.protocol.type.chunk.ChunkData;
@@ -21,6 +24,10 @@ public TestCommand(String name) {
     }
 
     public void execute(DragonProxy proxy, String[] args) {
+		if(args.length == 0) {
+			System.out.println("This is a developer's command! ");
+			return;
+		}
         UpstreamSession player = proxy.getSessionRegister().getAll().values().toArray(new UpstreamSession[1])[0];
         if (args[0].equalsIgnoreCase("status")) {
             PlayStatusPacket s = new PlayStatusPacket();
@@ -84,6 +91,20 @@ public void execute(DragonProxy proxy, String[] args) {
             data.encode();
             chunk.payload = data.getBuffer();
             player.sendPacket(chunk);
-        }
+        } else if (args[0].equalsIgnoreCase("form")) {
+			testForm(player);
+		}
     }
+
+    public static void testForm(UpstreamSession player) {
+		ModalFormRequestPacket p = new ModalFormRequestPacket();
+		CustomFormComponent form = new CustomFormComponent("\u00a7dTest Form");
+		form.addComponent(new LabelComponent("\u00a71Text \u00a7ki"));
+		form.addComponent(new LabelComponent("LABEL 2"));
+		form.addComponent(new DropDownComponent("DROP DOWN", Arrays.asList("option 1", "option 2")));
+		System.out.println(form.serializeToJson().toString());
+		p.formId = 1;
+		p.formData = form.serializeToJson().toString();
+		player.sendPacket(p);
+	}
 }
diff --git a/src/main/java/org/dragonet/proxy/gui/BaseModalFormComponent.java b/src/main/java/org/dragonet/proxy/gui/BaseModalFormComponent.java
new file mode 100644
index 000000000..834322c8a
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/gui/BaseModalFormComponent.java
@@ -0,0 +1,28 @@
+package org.dragonet.proxy.gui;
+
+import org.json.JSONObject;
+
+/**
+ * Created on 2017/12/26.
+ */
+public abstract class BaseModalFormComponent implements ModalFormComponent {
+
+	private final String type;
+
+	public BaseModalFormComponent(String type) {
+		this.type = type;
+	}
+
+	@Override
+	public String getType() {
+		return type;
+	}
+
+	@Override
+	public final JSONObject serializeToJson() {
+		JSONObject obj = new JSONObject();
+		obj.put("type", type);
+		serializeData(obj);
+		return obj;
+	}
+}
diff --git a/src/main/java/org/dragonet/proxy/gui/CustomFormComponent.java b/src/main/java/org/dragonet/proxy/gui/CustomFormComponent.java
new file mode 100644
index 000000000..d08227f61
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/gui/CustomFormComponent.java
@@ -0,0 +1,39 @@
+package org.dragonet.proxy.gui;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created on 2017/12/26.
+ */
+public class CustomFormComponent extends BaseModalFormComponent {
+
+	private String title;
+
+	private final List<ModalFormComponent> components = new ArrayList<>();
+
+	public CustomFormComponent(String title) {
+		super("custom_form");
+		this.title = title;
+	}
+
+	public CustomFormComponent addComponent(ModalFormComponent component){
+		components.add(component);
+		return this;
+	}
+
+	public List<ModalFormComponent> getComponents() {
+		return components;
+	}
+
+	@Override
+	public void serializeData(JSONObject out) {
+		out.put("title", title);
+		JSONArray content = new JSONArray();
+		components.forEach((c) -> content.put(c.serializeToJson()));
+		out.put("content", content);
+	}
+}
diff --git a/src/main/java/org/dragonet/proxy/gui/DropDownComponent.java b/src/main/java/org/dragonet/proxy/gui/DropDownComponent.java
new file mode 100644
index 000000000..c75b8aed4
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/gui/DropDownComponent.java
@@ -0,0 +1,27 @@
+package org.dragonet.proxy.gui;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.List;
+
+/**
+ * Created on 2017/12/26.
+ */
+public class DropDownComponent extends BaseModalFormComponent {
+
+	private String text;
+	private List<String> options;
+
+	public DropDownComponent(String text, List<String> options) {
+		super("dropdown");
+		this.text = text;
+		this.options = options;
+	}
+
+	@Override
+	public void serializeData(JSONObject out) {
+		out.put("text", text);
+		out.put("options", new JSONArray(options));
+	}
+}
diff --git a/src/main/java/org/dragonet/proxy/gui/LabelComponent.java b/src/main/java/org/dragonet/proxy/gui/LabelComponent.java
new file mode 100644
index 000000000..a038ddf73
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/gui/LabelComponent.java
@@ -0,0 +1,25 @@
+package org.dragonet.proxy.gui;
+
+import org.json.JSONObject;
+
+/**
+ * Created on 2017/12/26.
+ */
+public class LabelComponent extends BaseModalFormComponent {
+
+	private String text;
+
+	public LabelComponent(String text) {
+		super("label");
+		this.text = text;
+	}
+
+	public String getText() {
+		return text;
+	}
+
+	@Override
+	public void serializeData(JSONObject out) {
+		out.put("text", text);
+	}
+}
diff --git a/src/main/java/org/dragonet/proxy/gui/ModalFormComponent.java b/src/main/java/org/dragonet/proxy/gui/ModalFormComponent.java
new file mode 100644
index 000000000..c224d3a71
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/gui/ModalFormComponent.java
@@ -0,0 +1,16 @@
+package org.dragonet.proxy.gui;
+
+import org.json.JSONObject;
+
+/**
+ * Created on 2017/12/26.
+ */
+public interface ModalFormComponent {
+
+	String getType();
+
+	void serializeData(JSONObject out);
+
+	JSONObject serializeToJson();
+
+}
diff --git a/src/main/java/org/dragonet/proxy/protocol/Protocol.java b/src/main/java/org/dragonet/proxy/protocol/Protocol.java
index 33fba21d0..7d277b75c 100644
--- a/src/main/java/org/dragonet/proxy/protocol/Protocol.java
+++ b/src/main/java/org/dragonet/proxy/protocol/Protocol.java
@@ -73,6 +73,9 @@ public final class Protocol {
         packets.put(SET_ENTITY_LINK_PACKET, SetEntityLinkPacket.class);
         packets.put(PLAYER_INPUT_PACKET, PlayerInputPacket.class);
 
+		packets.put(MODAL_FORM_REQUEST_PACKET, ModalFormRequestPacket.class);
+		packets.put(MODAL_FORM_RESPONSE_PACKET, ModalFormResponsePacket.class);
+
         packets.put(CONTAINER_OPEN_PACKET, ContainerOpenPacket.class);
         packets.put(CONTAINER_CLOSE_PACKET, ContainerClosePacket.class);
         packets.put(INVENTORY_CONTENT_PACKET, InventoryContentPacket.class);
diff --git a/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormRequestPacket.java b/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormRequestPacket.java
new file mode 100644
index 000000000..47f4c3b1c
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormRequestPacket.java
@@ -0,0 +1,30 @@
+package org.dragonet.proxy.protocol.packets;
+
+import org.dragonet.proxy.protocol.PEPacket;
+import org.dragonet.proxy.protocol.ProtocolInfo;
+
+/**
+ * Created on 2017/12/26.
+ */
+public class ModalFormRequestPacket extends PEPacket {
+
+	public int formId;
+	public String formData;
+
+	@Override
+	public int pid() {
+		return ProtocolInfo.MODAL_FORM_REQUEST_PACKET;
+	}
+
+	@Override
+	public void encodePayload() {
+		putUnsignedVarInt(formId);
+		putString(formData);
+	}
+
+	@Override
+	public void decodePayload() {
+		formId = (int) (getUnsignedVarInt() & 0xFFFFFFFF);
+		formData = getString();
+	}
+}
diff --git a/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormResponsePacket.java b/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormResponsePacket.java
new file mode 100644
index 000000000..3f442ea6d
--- /dev/null
+++ b/src/main/java/org/dragonet/proxy/protocol/packets/ModalFormResponsePacket.java
@@ -0,0 +1,30 @@
+package org.dragonet.proxy.protocol.packets;
+
+import org.dragonet.proxy.protocol.PEPacket;
+import org.dragonet.proxy.protocol.ProtocolInfo;
+
+/**
+ * Created on 2017/12/26.
+ */
+public class ModalFormResponsePacket extends PEPacket {
+
+	private int formId;
+	private String formData;
+
+	@Override
+	public int pid() {
+		return ProtocolInfo.MODAL_FORM_RESPONSE_PACKET;
+	}
+
+	@Override
+	public void encodePayload() {
+		putUnsignedVarInt(formId);
+		putString(formData);
+	}
+
+	@Override
+	public void decodePayload() {
+		formId = (int) (getUnsignedVarInt() & 0xFFFFFFFF);
+		formData = getString();
+	}
+}