JavaScript errorSyntaxError: “missing ) after argument list”

Why the call is not closed, and the fix

1. 01

   A missing + or comma between values

   “There is an error with how a function is called. This might be a typo, a missing operator, or an unescaped string, for example.” MDN, SyntaxError: missing ) after argument list

   Two values side by side inside a call, with nothing joining them, end the argument too early. Add the operator or comma, or use a template literal.

   // SyntaxError: missing ) after argument list
   console.log('Total: ' total);
   
   console.log('Total: ' + total);
   console.log(`Total: ${total}`);

2. 02

   A quote that ends the string early

   An apostrophe inside a single-quoted string closes it, and the rest of the text is read as code. Escape it, switch quote style, or use a template literal.

   alert('It\'s done');
   alert("It's done");
   alert(`It's done`);

3. 03

   The call’s own closing parenthesis is missing

   When a call ends with an object or callback and the final ) is lost, the parser runs into the next statement and reports this error there. An unclosed { or [ inside the call gives Unexpected token ')' instead. Formatting the file with Prettier shows where the nesting goes wrong.

   fetch(url, {
     method: 'POST',
     body: JSON.stringify(data),
   }   // missing ) here
   console.log('sent');

4. 04

   Text that is not JavaScript inside the call

   A stray character from a copy and paste, a comment marker in the wrong place, or template syntax from another language (such as {{ value }}) inside a call often stops the parser with this error or a nearby one such as Unexpected token. Retype the arguments by hand.

Checked against the vendor’s docs on November 8, 2026: MDN: SyntaxError: missing ) after argument list.

Rather hand it over?

Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.

• from $450App Fix TicketOne reproducible bug in an existing mobile or web app, diagnosed and fixed.See scope and start
• from $450AI-Built App RescueA Lovable, Bolt or Cursor app checked end to end in 3 days, then its worst problems fixed at a fixed price.No issues worth fixing, no charge. If the Launch Check finds nothing rated medium or higher, Simon refunds the full $450. You keep the report either way. This applies to the first 10 Launch Checks bought after October 30, 2026.See scope and start

Related: “SyntaxError: Unexpected identifier” · “Invalid or unexpected token” · TypeError: “x is not a function”