In last four decades he has written over 750 books in Assamese language in different genres like Thriller, Social, Horror, Science Fiction, Children, Comedy, Adventure and considered as one of the most beloved writers of Assam.
Since childhood he had an inclination towards the literature and that eventually prompted him write few short stories and poems, those were published in some local newspapers and magazines.
At the age of fifteen, he finished writing the manuscript of his first Novel Bahurupi, after appearing the Class 10 Board Exams.
[2] Along with his studies, Hazarika started his first job as an Accountant in the Cooperative society of the Monabari Tea State.
Gradually, Hazarika started writing few other manuscripts of his famous novels like Klanta Surjyar Rashmi, Sandhan, Mayajaal, Duranta Dashyu, Nikhar Atithi, Eta Dip Satta Kabar, Gahin Banar Phool, Uttar Phalguni, Tamas Tapashya, Debajani etc.
Thousands of his short stories have been published in many Assamese Magazines like Bismoi, Rahashya, Trishool, Hiya, Mouchaak etc.
Few of characters from the series like Jason, Pawan, Nandan, Rohan, Jintan, Jitu, Ranjan, Valkan, Keron, Trinayan were very popular among the readers.
Aasene Kunuba Hiyat (2000) and Maya (2003) were two movies in Assamese language, based on his novels Uttar Phalguni and Narakar Phool respectively.
[9] In 2014, Film Division of India produced a documentary Rahashyar Bitchaku, based on his life of Ranju Hazarika, directed by Altaf Mazid.
[10] A number of serials were made from his novels, telecast in Doordarshan and famous Prahelika Series in DY 365.