HTML - How to prevent user from editing form's value?

Question

I am developing a simple web apps that allowed user to key in information using a form when I discovered I could edit that form\'s input default value using Chrome -> Check

Answer 1

For typical users, you can just add the attribute readonly to the form field(s).

For more advanced users/hackers that try to manipulate your server, you need to validate every piece of data that is submitted to ensure that tampering is caught and rejected. There is no client-side technique for this that is tamper-proof.