diff --git a/bindings.json b/bindings.json
index 13ceb9a..6fa0f43 100644
--- a/bindings.json
+++ b/bindings.json
@@ -2,8 +2,10 @@
     {
         "name": "raylib_core",
         "functions": [
-            { "name": "SetWindowTitle", "jsName": "setWindowTitle" },
-            { "name": "SetWindowPosition", "jsName": "setWindowPosition" }
+            { "name": "SetWindowTitle" },
+            { "name": "SetWindowPosition" },
+            { "name": "BeginDrawing" },
+            { "name": "EndDrawing" }
         ]        
     }
 ]
\ No newline at end of file
diff --git a/generate_bindings.js b/generate_bindings.js
index 2a8e1f6..a1e0eb7 100644
--- a/generate_bindings.js
+++ b/generate_bindings.js
@@ -46,32 +46,76 @@ const generateFunction = (functionList) => (func) => {
   return cfunc.generate()
 }
 
+const generateParameterCheck = (func) => (param, i) => {
+  const errMsg = `${func.name} argument ${param.name} (${i}) needs to be`
+  switch(param.type){
+    case "const char *":
+      return `if(!JS_IsString(argv[${i}])) return JS_ThrowReferenceError(ctx, "${errMsg} a string");`
+    case "int":
+      return `if(!JS_IsNumber(argv[${i}])) return JS_ThrowReferenceError(ctx, "${errMsg} a number");`
+    default:
+      throw new Error("Unknown parameter type: "+param.type)
+  }
+}
+
 const generateParameter = (param,i) => {
   switch(param.type){
     case "const char *":
       return `${param.type} ${param.name} = JS_ToCString(ctx, argv[${i}]);`
     case "int":
-      return `${param.type} ${param.name};\n    JS_ToInt32(ctx, &${param.name}, argv[${i}]);`
+      return `${param.type} ${param.name}; JS_ToInt32(ctx, &${param.name}, argv[${i}]);`
+    default:
+      throw new Error("Unknown parameter type: "+param.type)
+  }
+}
+
+const generateParameterCleanup = (param,i) => {
+  switch(param.type){
+    case "const char *":
+      return `JS_FreeCString(ctx, ${param.name});`
+    default:
+      return ""
   }
 }
 
 class CFunction {
   constructor(func, api, functionList){
     this.func = func
+    this.func.jsName = this.func.jsName || this.func.name.charAt(0).toLowerCase() + this.func.name.slice(1);
     this.api = api
+    this.api.params = this.api.params || [];
     this.functionList = functionList
     this.functionName = `js_${func.jsName}`
   }
 
+  generateParameterCheck(){
+    return this.api.params.map(generateParameterCheck(this.api))
+  }
+
   generateParameters(){
     return this.api.params.map(generateParameter)
   }
 
+  generateFunctionCall(){
+    return `${(this.api.returnType === 'void' ? '' : `${this.api.returnType} result = `)}${this.api.name}(${this.api.params.map(x => x.name).join(", ")});`
+  }
+
+  generateReturn(){
+    return this.api.returnType === 'void' ? 'return JS_UNDEFINED;' : 'return result'
+  }
+
+  generateParametersCleanup(){
+    return this.api.params.map(generateParameterCleanup).filter(x => x !== "")
+  }
+
   generate(){
     this.functionList.addFunctionDef(this.func.jsName, this.api.params.length, this.functionName)
     return `static JSValue ${this.functionName}(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv){
-${this.generateParameters().map(x => "    "+x).join("\n")}
-    return JS_UNDEFINED;
+    ${this.generateParameterCheck().join("\n    ")}    
+    ${this.generateParameters().join("\n    ")}    
+    ${this.generateFunctionCall()}    
+    ${this.generateParametersCleanup().join("\n    ")}        
+    ${this.generateReturn()}
 }`
   }
 }
diff --git a/main.js b/main.js
index 10e92a7..17835fe 100644
--- a/main.js
+++ b/main.js
@@ -1,5 +1,6 @@
-import { setWindowTitle } from "raylib.core"
+import { setWindowTitle, setWindowPosition } from "raylib.core"
 
-console.log(setWindowTitle("Test"))
+setWindowTitle("My Window")
+setWindowPosition(50,50)
 
 
diff --git a/src/bindings/js_raylib_core.h b/src/bindings/js_raylib_core.h
index 7fbec86..070fde5 100644
--- a/src/bindings/js_raylib_core.h
+++ b/src/bindings/js_raylib_core.h
@@ -13,21 +13,44 @@
 #endif
 
 static JSValue js_setWindowTitle(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv){
-    const char * title = JS_ToCString(ctx, argv[0]);
+    if(!JS_IsString(argv[0])) return JS_ThrowReferenceError(ctx, "SetWindowTitle argument title (0) needs to be a string");    
+    const char * title = JS_ToCString(ctx, argv[0]);    
+    SetWindowTitle(title);    
+    JS_FreeCString(ctx, title);        
     return JS_UNDEFINED;
 }
 
 static JSValue js_setWindowPosition(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv){
-    int x;
-    JS_ToInt32(ctx, &x, argv[0]);
-    int y;
-    JS_ToInt32(ctx, &y, argv[1]);
+    if(!JS_IsNumber(argv[0])) return JS_ThrowReferenceError(ctx, "SetWindowPosition argument x (0) needs to be a number");
+    if(!JS_IsNumber(argv[1])) return JS_ThrowReferenceError(ctx, "SetWindowPosition argument y (1) needs to be a number");    
+    int x; JS_ToInt32(ctx, &x, argv[0]);
+    int y; JS_ToInt32(ctx, &y, argv[1]);    
+    SetWindowPosition(x, y);    
+            
+    return JS_UNDEFINED;
+}
+
+static JSValue js_beginDrawing(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv){
+        
+        
+    BeginDrawing();    
+            
+    return JS_UNDEFINED;
+}
+
+static JSValue js_endDrawing(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv){
+        
+        
+    EndDrawing();    
+            
     return JS_UNDEFINED;
 }
 
 static const JSCFunctionListEntry js_raylib_core_funcs[] = {
     JS_CFUNC_DEF("setWindowTitle", 1, js_setWindowTitle),
-    JS_CFUNC_DEF("setWindowPosition", 2, js_setWindowPosition)
+    JS_CFUNC_DEF("setWindowPosition", 2, js_setWindowPosition),
+    JS_CFUNC_DEF("beginDrawing", 0, js_beginDrawing),
+    JS_CFUNC_DEF("endDrawing", 0, js_endDrawing)
 };
 
 static int js_raylib_core_init(JSContext *ctx, JSModuleDef *m){
diff --git a/src/quickjs.c b/src/quickjs.c
index f1b474f..8ab1455 100644
--- a/src/quickjs.c
+++ b/src/quickjs.c
@@ -71,7 +71,7 @@ int app_update_quickjs(){
 }
 
 int app_dispose_quickjs(){
-    js_std_free_handlers(rt);
+    //js_std_free_handlers(rt);
     JS_FreeContext(ctx);
     JS_FreeRuntime(rt);
     return 0;
@@ -86,7 +86,7 @@ static JSContext *JS_NewCustomContext(JSRuntime *rt)
         return NULL;
 
     /* system modules */
-    //js_init_module_std(ctx, "std");
+    js_init_module_std(ctx, "std");
     //js_init_module_os(ctx, "os");
     js_init_module_raylib_core(ctx, "raylib.core");
     return ctx;