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TypeError: null/undefined has no properties

The JavaScript exception "null (or undefined) has no properties" occurs when you attempt to access properties of null and {{jsxref("undefined")}}. They don't have any.

Message​

TypeError: Cannot read properties of undefined (reading 'x') (V8-based)
TypeError: Cannot destructure 'x' as it is undefined. (V8-based)
TypeError: Cannot destructure property 'x' of 'y' as it is undefined. (V8-based)
TypeError: null has no properties (Firefox)
TypeError: undefined has no properties (Firefox)
TypeError: undefined is not an object (evaluating 'undefined.x') (Safari)
TypeError: Right side of assignment cannot be destructured (Safari)

Error type​

.

What went wrong?​

Both null and {{jsxref("undefined")}} have no properties you could access. Therefore, you cannot use property accessors on them, or destructure them.

Examples​

null and undefined have no properties​

null.foo;
// TypeError: null has no properties

undefined.bar;
// TypeError: undefined has no properties

See also​

  • null
  • {{jsxref("undefined")}}