Both Object.freeze() and Object.seal() serve a similar purpose, but there's one key difference you need to remember.

30Seconds is a platform for sharing and discovering quick tips, life hacks, and practical advice on a wide range of topics. Through user submissions and comments, 30Seconds offers insights into productivity tips, wellness advice, cooking hacks, and parenting strategies. Readers can learn something new in just 30 seconds and contribute their own tips and advice to help others improve their lives.

30 seconds of code

Object.freeze() and Object.seal() serve as ways to prevent a JavaScript object from being altered. Both methods perform a shallow freeze/seal on the object. nested objects and arrays are not frozen or sealed and can be mutated. To prevent this, you can deep freeze objects, as described in this related article.

What is the difference between Object.freeze() and Object.seal() in JavaScript?

Also VERY helpful is the deepFreeze function that can be found on the same site, as it freezes an object and all nested objects.
<a href="https://www.30secondsofcode.org/js/s/deep-freeze" target="_blank" rel="noopener nofollow">https://www.30secondsofcode.org/js/s/deep-freeze</a>

I’m curios.  Client side, is there ever a reason you’d want/need to freeze an object?