JavaScript TypeError – “X” has no properties

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This JavaScript exception null (or undefined) has no properties that occur if there is an attempt to access properties of null and undefined. They don’t have any such properties.

Message:

TypeError: Unable to get property {x} of undefined or null reference (Edge)
TypeError: null has no properties (Firefox)
TypeError: undefined has no properties (Firefox)

Error Type:

TypeError

Cause of Error: Somewhere, there is access to properties of null or undefined.

Example 1: In this example, the variable(‘GFG’) is assigned the null value and It doesn’t have any property, So the error has occurred.

Javascript

let GFG = null;
console.log(GFG.prop_name);

Output(In Edge console):

TypeError: Unable to get property 'prop_name' of 
undefined or null reference

Example 2: In this example, the variable(‘var_name’) is assigned the undefined value and It doesn’t have any property, So the error has occurred.

Javascript

let var_name = undefined;
console.log(var_name.prop_name);

Output(In Edge console):

TypeError: Unable to get property 'prop_name' of 
undefined or null reference

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