Yes, you can eat peanuts as a Jain, but with some important conditions.

1. Are peanuts basically allowed?

- Peanut (singdāna/groundnut) is a seed/legume, not a root vegetable (kand-mūl like potato, onion, garlic, carrot). - Because of this, in both Shwetambar and Digambar traditions, peanuts are generally permitted in normal days, if taken carefully.

1. When to be careful or avoid:

- During Paryushan / Das Lakshan / special vows many Jains avoid all underground items, and often peanuts also, to reduce himsa. - Some families/sanghs avoid peanuts all the time as an extra vow. In that case, you should follow your family/guru’s maryādā.

1. How to eat peanuts in a more Jain way:

- Use dry, clean, insect‑free, preferably roasted peanuts. - Do not use sprouted or moist/green peanuts. - Eat freshly prepared food, before sunset, no leftovers overnight. - Avoid mixing with onion, garlic, or fermented items.

Simple summary:

• Normal days: Peanuts are generally allowed for Jains, if taken clean and in moderation.
• Festivals / fasts / stricter vows: Often avoided.

Always give first importance to ahimsa and to your own guru / family rules.