TypeError: More arguments needed

The JavaScript exception "more arguments needed" occurs when there is an error with how a function is called. More arguments need to be provided.

Message#

TypeError: Object prototype may only be an Object or null: undefined (V8-based)
TypeError: Object.create requires at least 1 argument, but only 0 were passed (Firefox)
TypeError: Object.setPrototypeOf requires at least 2 arguments, but only 0 were passed (Firefox)
TypeError: Object.defineProperties requires at least 1 argument, but only 0 were passed (Firefox)
TypeError: Object prototype may only be an Object or null. (Safari)

Error type#

{{jsxref("TypeError")}}.

What went wrong?#

There is an error with how a function is called. More arguments need to be provided.

Examples#

Required arguments not provided#

The {{jsxref("Object.create()")}} method requires at least one argument and the {{jsxref("Object.setPrototypeOf()")}} method requires at least two arguments:

```js example-bad const obj = Object.create(); // TypeError: Object.create requires at least 1 argument, but only 0 were passed

const obj2 = Object.setPrototypeOf({}); // TypeError: Object.setPrototypeOf requires at least 2 arguments, but only 1 were passed

You can fix this by setting [`null`](/en-US/docs/Web/JavaScript/Reference/Operators/null) as the prototype, for example:

```js example-good
const obj = Object.create(null);

const obj2 = Object.setPrototypeOf({}, null);

See also#

• Functions guide