diff --git a/nix-js/src/codegen.rs b/nix-js/src/codegen.rs
index ddbeaaa..f69712d 100644
--- a/nix-js/src/codegen.rs
+++ b/nix-js/src/codegen.rs
@@ -11,28 +11,29 @@ pub(crate) trait CodegenContext {
     fn get_sym(&self, id: SymId) -> &str;
 }
 
+fn escape_quote_string(s: &str) -> String {
+    let mut escaped = String::with_capacity(s.len() + 2);
+    escaped.push('"');
+    for c in s.chars() {
+        match c {
+            '\\' => escaped.push_str("\\\\"),
+            '\"' => escaped.push_str("\\\""),
+            '\n' => escaped.push_str("\\n"),
+            '\r' => escaped.push_str("\\r"),
+            '\t' => escaped.push_str("\\t"),
+            _ => escaped.push(c),
+        }
+    }
+    escaped.push('"');
+    escaped
+}
+
 impl<Ctx: CodegenContext> Compile<Ctx> for Ir {
     fn compile(&self, ctx: &Ctx) -> String {
         match self {
             Ir::Int(int) => format!("{int}n"), // Generate BigInt literal
             Ir::Float(float) => float.to_string(),
-            Ir::Str(s) => {
-                // Escape string for JavaScript
-                let mut escaped = String::with_capacity(s.val.len() + 2);
-                escaped.push('"');
-                for c in s.val.chars() {
-                    match c {
-                        '\\' => escaped.push_str("\\\\"),
-                        '\"' => escaped.push_str("\\\""),
-                        '\n' => escaped.push_str("\\n"),
-                        '\r' => escaped.push_str("\\r"),
-                        '\t' => escaped.push_str("\\t"),
-                        _ => escaped.push(c),
-                    }
-                }
-                escaped.push('"');
-                escaped
-            }
+            Ir::Str(s) => escape_quote_string(&s.val),
             Ir::Path(p) => {
                 // Path needs runtime resolution for interpolated paths
                 let path_expr = ctx.get_ir(p.expr).compile(ctx);
@@ -259,7 +260,7 @@ impl<Ctx: CodegenContext> Compile<Ctx> for AttrSet {
         for (&sym, &expr) in &self.stcs {
             let key = ctx.get_sym(sym);
             let value = ctx.get_ir(expr).compile(ctx);
-            attrs.push(format!("\"{}\": {}", key, value));
+            attrs.push(format!("{}: {}", escape_quote_string(key), value));
         }
 
         for (key_expr, value_expr) in &self.dyns {