diff --git a/core/src/mindustry/mod/ContentParser.java b/core/src/mindustry/mod/ContentParser.java
index a5e2cdf39b..b83af88097 100644
--- a/core/src/mindustry/mod/ContentParser.java
+++ b/core/src/mindustry/mod/ContentParser.java
@@ -48,6 +48,7 @@ public class ContentParser{
     ObjectMap<Class<?>, ContentType> contentTypes = new ObjectMap<>();
     ObjectSet<Class<?>> implicitNullable = ObjectSet.with(TextureRegion.class, TextureRegion[].class, TextureRegion[][].class);
     ObjectMap<String, AssetDescriptor<?>> sounds = new ObjectMap<>();
+    Seq<ParseListener> listeners = new Seq<>();
 
     ObjectMap<Class<?>, FieldParser> classParsers = new ObjectMap<>(){{
         put(Effect.class, (type, data) -> {
@@ -178,7 +179,10 @@ public class ContentParser{
         @Override
         public <T> T readValue(Class<T> type, Class elementType, JsonValue jsonData, Class keyType){
             T t = internalRead(type, elementType, jsonData, keyType);
-            if(t != null) checkNullFields(t);
+            if(t != null && !Reflect.isWrapper(t.getClass()) && (type == null || !type.isPrimitive())){
+                checkNullFields(t);
+                listeners.each(hook -> hook.parsed(type, jsonData, t));
+            }
             return t;
         }
 
@@ -805,4 +809,8 @@ public class ContentParser{
         public float time = 60f * 10f;
     }
 
+    public interface ParseListener{
+        void parsed(Class<?> type, JsonValue jsonData, Object result);
+    }
+
 }
diff --git a/core/src/mindustry/mod/Mods.java b/core/src/mindustry/mod/Mods.java
index e4b865de88..bd95c20504 100644
--- a/core/src/mindustry/mod/Mods.java
+++ b/core/src/mindustry/mod/Mods.java
@@ -21,6 +21,7 @@ import mindustry.game.EventType.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
 import mindustry.graphics.MultiPacker.*;
+import mindustry.mod.ContentParser.*;
 import mindustry.type.*;
 import mindustry.ui.*;
 
@@ -651,6 +652,11 @@ public class Mods implements Loadable{
         parser.markError(content, error);
     }
 
+    /** Adds a listener for parsed JSON objects. */
+    public void addParseListener(ParseListener hook){
+        parser.listeners.add(hook);
+    }
+
     /** @return a list of mods and versions, in the format name:version. */
     public Seq<String> getModStrings(){
         return mods.select(l -> !l.meta.hidden && l.enabled()).map(l -> l.name + ":" + l.meta.version);