The hacking of the website comes amid a row over an event at the varsity against hanging of Parliament attack convict Afzal Guru and in solidarity with "struggle" of Kashmiri migrants, at varsity's Sabarmati dhaba.
The website claimed to be hacked by "Bl@Ck Dr@GoN" read "So, As You Said 'Kashmir ki Aazadi Tak Jang Rahegi-Jang Rahegi' You are thinking that you will get Kashmir just by barking in the Campus of JNU".
The varsity's library authorities, said, "The hacking of the website was noticed after office hours. The matter has been reported to the university's IT department and measures are being taken to rectify it".
"No official complaint has been made in this regard yet," they added.
The slogans displayed in the message were allegedly shouted at the February 9 event at the varsity, in connection with which its student union president Kanhaiya Kumar was arrested in a sedition case, triggering widespread outrage among students and drawing criticism from non-BJP political parties.
The varsity's Central Library website provides access to 72 online databases, library catalogue, 20,000 electronic theses and dissertations, 8 lakh digital press clippings, 2,300 e-newspapers in 57 languages from 100 countries and over 2 lakh e-books, and all e-journals.