The biggest security mindset shift for me was understanding that input is not something a user enters in a form element. Input is literally everything that comes to your server (since everything can be tampered with), so treat it as such!
That async request you yourself wrote so you think you can trust it? Validate that payload same as you would a text field.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.