Ashok Banker worked as a successful freelance journalist and columnist for several years, breaking front-page news for publications such as The Times of India, Mumbai, and cover stories for Outlook magazine, New Delhi.

Banker is a contemporary Indian novelist often counted among the significant literary names in post-colonial Indian literature His work is the focus of several academic studies for its cross-cultural themes and realistic portrayals of Indian urban issues. He was earlier also known as a reviewer and commentator on contemporary Indian literature, and as a candid essayist with a particular focus on media hypocrisy in India, and the western racial bias against South Asian writers.

Banker has published in several genres, ranging from contemporary fiction about urban life in India to multi-volume mythological epics, as well as cross-genre works. Three of his early novels to be published were crime thriller, claimed to be the first written by an Indian novelist in English. They gained him widespread attention and still continue to be regarded with critical approval. Most recently, literary critic Zac O'Yeah wrote: "Slimmer and much more hard-boiled are three striking crime novels written by Ashok Banker many years ago. I still remember reading The Iron Bra, a blood-soaked story of a female investigator, Sheila Ray, whose finger rests lightly on the trigger as she defends her family’s reputation and takes on gangsters in a particularly unforgettable shootout. The growing city’s construction sites were a crucial component in the tight plot. Tragically, my own copy is long lost and second-hand copies cost $129 (approx. Rs6,000) plus shipping on an online bookshop, so it looks like it’s high time to have this gem of a crime novel reissued in an omnibus edition along with Banker’s Ten Dead Admen and Murder & Champagne (all three originally published in 1993)."

The stories of his "Devi" series are short works featuring avatar of the Hindu goddess Devi, and have appeared in various science fiction, fantasy, and horror magazines.

Three of his novels contain autobiographical elements and are closely related to one another. His first novel (though the fifth published) Vertigo is about a man struggling to make a successful career and home life in Bombay (the former name of Mumbai). Byculla Boy takes its name from the Byculla suburb of Bombay where he and his mother grew up. Beautiful Ugly and the complementary documentary of the same title are a tribute to his mother, portraying the tragic events of her life.

He was a prolific literary critic and reviewer, known for his candour and bluntness in reviewing books by Indian authors. His views often veered from the outright derogatory to effusive praise.

He is one of few contemporary Indian authors writing in English to be included in prestigious anthologies such as The Vintage Book of Modern Indian Literature and The Picador Book of Modern Indian Literature.

He wrote a short non-fiction book about Bollywood entitled Bollywood: The Pocket Essential (2001).

He is currently best known for his Ramayana Series, a freely imaginative retelling of the ancient Sanskrit epic poem. The series is ranked at No.1 on the "Internet Book List".

His previously published works include:

• Amazing Adventure at Chotta Sheher (1992)
• The Iron Bra (1993)
• Murder & Champagne (1993)
• Ten Dead Admen (1993)
• Vertigo (1993)
• Byculla Boy (1994)
• The Missing Parents Mystery (1994)
• The Pocket Essential Bollywood (2001)
• Gods of War (2009)

The Ramayana series

• Prince of Ayodhya (2003)
• Siege of Mithila (2003)
• Demons of Chitrakut (2004)
• Armies of Hanuman (2005)
• Bridge of Rama (2005)
• King of Ayodhya (2006)

Collected as omnibus volumes

• Prince of Dharma (2007)
• Prince in Exile (2007)
• Prince at War (2007)

Other works

• A Mouthful of Sky -TV Series created and written by Banker (1995—96)
• Bad Karma Online serial (first published on Top Write Corner website) (1998)
• Brandwarriors Magazine series published in The Advertising Brief, now defunct ad magazine published by Mid-day Group (1999)
• Bombay Times (2000) (a.k.a. "Swing City") Revised and expanded book-length novel originally published as an online serial on Rediff.com
• Vortal (2000—01) Multimedia serial published in CD-Rom magazine "Mahazine"