Uncaught TypeError: Cannot read property of undefined

In this article, we will show you how to resolve a JavaScript error Uncaught TypeError: Cannot read property of undefined. Undefined means that a variable has been declared but has not been assigned a value.


Solution 1:

When such an error is encountered, make sure that the variable causing the error is assigned a value.

Solution 2:

If you use JavaScript according to ECMAScript 2020 or later, see optional chaining.
Use it like this: obj?.a?.lot?.of?.properties

Solution 3:

Alternatively, an if check should be added before dealing with variables.

Let’s update the previous example to include an if check.

I hope you find this article helpful.
Thank you for reading. Happy Coding..!! 🙂

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