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You can’t.
Client-side JavaScript isn’t secure by design, i.e. user has full control over the script that runs in user’s browser. Considering that a user has enough access rights locally, the code always can be read and modified. Security measures that are applicable to client-side code only make this process more complicated.
Never trust anything from the client. The client can change whatever they desire, and can even edit the data that’s going to the server. If you wish to ensure they can’t do something, then you will have to put checks on the only thing they can’t change
How to prevent the user from changing values in the HTML or the JavaScript
Can react state be tampered with to bypass security measures?
Source:stackexchange.com