diff --git a/curlconverter/generators/javascript.py b/curlconverter/generators/javascript.py
index 4ccfafb..2a2fd93 100644
--- a/curlconverter/generators/javascript.py
+++ b/curlconverter/generators/javascript.py
@@ -1,4 +1,4 @@
-"""JavaScript code generator."""
+{"""JavaScript code generator."""
 
 import json
 from curlconverter.parser import ParsedCurl
@@ -24,7 +24,8 @@ def _detect_content_type(headers: dict, data: str) -> str:
 def generate_javascript(parsed: ParsedCurl) -> str:
     """Generate JavaScript fetch code from parsed curl data."""
     lines = []
-    lines.append("const url = " + repr(parsed.url) + ";")
+    
+    lines.append(f"const url = {repr(parsed.url)};")
     lines.append("")
     
     options = {"method": parsed.method}
@@ -33,46 +34,37 @@ def generate_javascript(parsed: ParsedCurl) -> str:
     if parsed.user_agent and "User-Agent" not in headers and "user-agent" not in headers:
         headers["User-Agent"] = parsed.user_agent
     
+    if parsed.auth:
+        encoded = btoa(f"{parsed.auth[0]}:{parsed.auth[1]}")
+        headers["Authorization"] = f"Basic {encoded}"
+    
     if parsed.data:
         content_type = _detect_content_type(headers, parsed.data)
         
         if content_type == "application/json":
             try:
                 json_data = json.loads(parsed.data)
-                lines.append("const jsonData = " + json.dumps(json_data, indent=2) + ";")
-                options["body"] = "JSON.stringify(jsonData)"
-                if "Content-Type" not in headers and "content-type" not in headers:
-                    headers["Content-Type"] = "application/json"
+                options["body"] = json.dumps(json_data)
+                headers["Content-Type"] = "application/json"
             except (json.JSONDecodeError, TypeError):
-                lines.append("const data = " + repr(parsed.data) + ";")
-                options["body"] = "data"
+                options["body"] = repr(parsed.data)
         else:
-            lines.append("const data = " + repr(parsed.data) + ";")
-            options["body"] = "data"
+            options["body"] = repr(parsed.data)
     
     if parsed.cookies:
-        if "Cookie" not in headers and "cookie" not in headers:
-            headers["Cookie"] = parsed.cookies
+        headers["Cookie"] = parsed.cookies
     
     if headers:
-        lines.append("const headers = " + _format_object(headers) + ";")
+        lines.append("const headers = " + json.dumps(headers, indent=2) + ";")
         options["headers"] = "headers"
     
-    if parsed.auth:
-        auth_str = f"{parsed.auth[0]}:{parsed.auth[1]}"
-        import base64
-        encoded = base64.b64encode(auth_str.encode()).decode()
-        lines.append("const auth = " + repr(encoded) + ";")
-        if "Authorization" not in headers and "content-type" not in headers:
-            lines.append("const headersWithAuth = {")
-            lines.append("  ...headers,")
-            lines.append('  "Authorization": `Basic ${auth}`')
-            lines.append("};")
-            options["headers"] = "headersWithAuth"
+    if len(options) > 1:
+        lines.append("const options = " + json.dumps(options, indent=2) + ";")
+        lines.append("")
+        lines.append("fetch(url, options)")
+    else:
+        lines.append("fetch(url)")
     
-    options_str = _format_options(options)
-    lines.append("")
-    lines.append(f"fetch(url, {options_str})")
     lines.append("  .then(response => {")
     lines.append("    console.log(response.status);")
     lines.append("    return response.text();")
@@ -80,24 +72,4 @@ def generate_javascript(parsed: ParsedCurl) -> str:
     lines.append("  .then(data => console.log(data))")
     lines.append("  .catch(error => console.error(error));")
     
-    return "\n".join(lines)
-
-
-def _format_object(obj: dict) -> str:
-    """Format an object for JavaScript code."""
-    if not obj:
-        return "{}"
-    items = []
-    for k, v in obj.items():
-        items.append(f'  {repr(k)}: {repr(v)}')
-    return "{\n" + ",\n".join(items) + "\n}"
-
-
-def _format_options(opts: dict) -> str:
-    """Format fetch options for JavaScript code."""
-    if not opts:
-        return "{}"
-    items = []
-    for k, v in opts.items():
-        items.append(f"    {k}: {v}")
-    return "{\n" + ",\n".join(items) + "\n  }"
+    return "\n".join(lines)
\ No newline at end of file