Are boiled and a bit salted peanuts healthy as a snack for a diet?

Peanuts are high in protein--and in fats. Moderation, just fine. One ounce of boiled peanuts is 90 calories, a perfectly reasonable (if small) snack with 56 of those calories coming from fat.

Thank you very much for your answers :)

Most foods are ok in moderation. Too much salt can be bad for you. You do have to watch the carbs. But otherwise, they can be reasonably healthy.

you'll be fine to eat them