diff --git a/src/stores/nodeDefStore.ts b/src/stores/nodeDefStore.ts
index ecd10df71..6002f46cc 100644
--- a/src/stores/nodeDefStore.ts
+++ b/src/stores/nodeDefStore.ts
@@ -169,21 +169,21 @@ export class ComfyNodeDefImpl {
     this.deprecated = obj.deprecated ?? obj.category === ''
     this.experimental =
       obj.experimental ?? obj.category.startsWith('_for_testing')
-    this.input = new ComfyInputsSpec(obj.input)
+    this.input = new ComfyInputsSpec(obj.input ?? {})
     this.output = ComfyNodeDefImpl.transformOutputSpec(obj)
     this.nodeSource = getNodeSource(obj.python_module)
   }
 
   private static transformOutputSpec(obj: any): ComfyOutputsSpec {
     const { output, output_is_list, output_name, output_tooltips } = obj
-    const result = output.map((type: string | any[], index: number) => {
+    const result = (output ?? []).map((type: string | any[], index: number) => {
       const typeString = Array.isArray(type) ? 'COMBO' : type
 
       return new ComfyOutputSpec(
         index,
-        output_name[index],
+        output_name?.[index],
         typeString,
-        output_is_list[index],
+        output_is_list?.[index],
         Array.isArray(type) ? type : undefined,
         output_tooltips?.[index]
       )
diff --git a/src/types/apiTypes.ts b/src/types/apiTypes.ts
index db8073a84..4838604e9 100644
--- a/src/types/apiTypes.ts
+++ b/src/types/apiTypes.ts
@@ -346,10 +346,10 @@ const zComfyOutputTypesSpec = z.array(
 )
 
 const zComfyNodeDef = z.object({
-  input: zComfyInputsSpec,
-  output: zComfyOutputTypesSpec,
-  output_is_list: z.array(z.boolean()),
-  output_name: z.array(z.string()),
+  input: zComfyInputsSpec.optional(),
+  output: zComfyOutputTypesSpec.optional(),
+  output_is_list: z.array(z.boolean()).optional(),
+  output_name: z.array(z.string()).optional(),
   output_tooltips: z.array(z.string()).optional(),
   name: z.string(),
   display_name: z.string(),
diff --git a/tests-ui/tests/nodeDef.test.ts b/tests-ui/tests/nodeDef.test.ts
index 664531f32..9a4e6e3ac 100644
--- a/tests-ui/tests/nodeDef.test.ts
+++ b/tests-ui/tests/nodeDef.test.ts
@@ -356,6 +356,20 @@ describe('ComfyNodeDefImpl', () => {
     expect(result.output.all).toEqual([])
   })
 
+  it('should handle undefined fields', () => {
+    const plainObject = {
+      name: 'EmptyOutputNode',
+      display_name: 'Empty Output Node',
+      category: 'Test',
+      python_module: 'test_module',
+      description: 'A node with no outputs'
+    }
+
+    const result = new ComfyNodeDefImpl(plainObject)
+    expect(result.output.all).toEqual([])
+    expect(result.input.all).toEqual([])
+  })
+
   it('should handle complex input specifications', () => {
     const plainObject = {
       name: 'ComplexInputNode',