While the Eighth Schedule of the Indian Constitution lists 22 languages (which have been referred to as scheduled languages and given recognition, status and official encouragement),  the Constitution of India (which is the longest written constitution of any country on Earth) designates the official language of the Government of India as English as well as Standard Hindi written in the Devanagari script
Article 343 (1) of the Constitution of India states "The Official Language of the Union government shall be Hindi in Devanagari script." 
