diff --git a/src/wasm/node_property.rs b/src/wasm/node_property.rs
index 2fa35956..92709605 100644
--- a/src/wasm/node_property.rs
+++ b/src/wasm/node_property.rs
@@ -4,15 +4,14 @@ use serde::Serialize;
 use super::ast_node::WasmAstNode;
 use super::macros::to_wasm;
 use super::to_wasm::ToWasm;
-use super::AdditionalProperties;
 use crate::compare::ElispFact;
 use crate::types::NodeProperty;
 use crate::wasm::to_wasm::ToWasmStandardProperties;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct WasmNodeProperty {
-    #[serde(flatten)]
-    pub(crate) additional_properties: AdditionalProperties,
+    pub(crate) key: String,
+    pub(crate) value: Option<String>,
 }
 
 to_wasm!(
@@ -21,12 +20,13 @@ to_wasm!(
     original,
     wasm_context,
     { WasmAstNode::NodeProperty(original) },
-    { "TODO".into() },
+    { "node-property".into() },
     {
         Ok((
             Vec::new(),
             WasmNodeProperty {
-                additional_properties: AdditionalProperties::default(),
+                key: original.property_name.to_owned(),
+                value: original.value.map(|s| s.to_owned()),
             },
         ))
     }