Cannot read properties of undefined (reading ‘pathname’)

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A common error in JavaScript is TypeError: Cannot read properties of undefined (reading 'pathname').

This error occurs when you try to access a property of an undefined or null value. In this specific case, it is trying to read the pathname property of an undefined value.

Here’s an example:

// Undefined variable
let person;

// Trying to access a property of an undefined value
console.log(person.name);

In the above example, the person variable is not assigned any value, so it is undefined. When trying to access the name property of the undefined person, the TypeError is thrown.

To fix this error, you need to ensure that an object is defined and contains the property you are trying to access. Here’s an updated example:

let person = {
  name: "John"
};

console.log(person.name); // Output: John

In the above example, the person object is defined with a name property. Now, when accessing person.name, it will output the value “John” instead of throwing an error.

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