In Jainism, coffee is generally discouraged and best avoided, especially if you want to follow stricter Jain practice.

Main reasons:

1. Ahimsa (non‑violence)

- Coffee is usually made with water that has many tiny living beings (nigod). - Boiling and keeping liquids standing can increase harm to these micro‑organisms. - Stricter Jains try to avoid such avoidable himsa and prefer simple, clean, filtered/boiled water and mild drinks.

1. Stimulant / addiction

- Coffee contains caffeine, a strong stimulant. - Jain dharma encourages a calm, controlled, non‑dependent mind. Things that create habit, craving or mental disturbance (like strong stimulants or intoxicants) are avoided. - Regular coffee can easily become a daily dependency (rāga/attachment).

1. Traditional practice

- Sadhus and sadhvīs (monks and nuns) do not take coffee or tea at all. - Many serious householders in both Śvetāmbara and Digambar traditions also avoid tea/coffee. - Some lay Jains still drink coffee out of habit; this is a lenient practice, not the ideal.

So, is it “allowed”?

• Scriptures do not mention “coffee” by name (it is a later product).
• But applying Jain principles, the saṃyam (more disciplined) path is: don’t drink coffee.
• If someone still takes it:

- keep it rare and minimal, - use freshly filtered, freshly boiled water, - avoid keeping it standing, and - work towards reducing and finally stopping for better spiritual progress.

If you are trying to follow Jain principles more seriously, the best and safest answer is: avoid coffee.

You can read a short explanation here