Beyond his fiction, James was one of the more important literary critics in the history of the novel.
In his classic essay The Art of Fiction (1884), he argued against rigid prescriptions on the novelist's choice of subject and method of treatment.
He maintained that the widest possible freedom in content and approach would help ensure narrative fiction's continued vitality.
James wrote many valuable critical articles on other novelists; typical is his book-length study of Nathaniel Hawthorne, which has been the subject of critical debate.
Richard Brodhead has suggested that the study was emblematic of James's struggle with Hawthorne's influence, and constituted an effort to place the elder writer "at a disadvantage."
Gordon Fraser, meanwhile, has suggested that the study was part of a more commercial effort by James to introduce himself to British readers as Hawthorne's natural successor.

When James assembled the New York Edition of his fiction in his final years, he wrote a series of prefaces that subjected his own work to searching, occasionally harsh criticism.

At 22 James wrote The Noble School of Fiction for The Nation's first issue in 1865.
He would write, in all, over 200 essays and book, art, and theatre reviews for the magazine.

For most of his life James harboured ambitions for success as a playwright.
He converted his novel The American into a play that enjoyed modest returns in the early 1890s.
In all he wrote about a dozen plays, most of which went unproduced.
His costume drama Guy Domville failed disastrously on its opening night in 1895.
James then largely abandoned his efforts to conquer the stage and returned to his fiction.
In his Notebooks he maintained that his theatrical experiment benefited his novels and tales by helping him dramatise his characters' thoughts and emotions.
James produced a small but valuable amount of theatrical criticism, including perceptive appreciations of Henrik Ibsen.

With his wide-ranging artistic interests, James occasionally wrote on the visual arts.
Perhaps his most valuable contribution was his favourable assessment of fellow expatriate John Singer Sargent, a painter whose critical status has improved markedly in recent decades.
James also wrote sometimes charming, sometimes brooding articles about various places he visited and lived in.
His most famous books of travel writing include Italian Hours (an example of the charming approach) and The American Scene (on the brooding side).

James was one of the great letter-writers of any era.
More than ten thousand of his personal letters are extant, and over three thousand have been published in a large number of collections.
A complete edition of James's letters began publication in 2006, edited by Pierre Walker and Greg Zacharias.
As of 2014, eight volumes have been published, covering the period from 1855 to 1880.
James's correspondents included celebrated contemporaries like Robert Louis Stevenson, Edith Wharton and Joseph Conrad, along with many others in his wide circle of friends and acquaintances.
The letters range from the "mere twaddle of graciousness" to serious discussions of artistic, social and personal issues.

Very late in life James began a series of autobiographical works: A Small Boy and Others, Notes of a Son and Brother, and the unfinished The Middle Years.
These books portray the development of a classic observer who was passionately interested in artistic creation but was somewhat reticent about participating fully in the life around him.
Beyond his fiction, James was one of the more important literary critics in the history of the novel. In his classic essay The Art of Fiction (1884), he argued against rigid prescriptions on the novelist's choice of subject and method of treatment. He maintained that the widest possible freedom in content and approach would help ensure narrative fiction's continued vitality. James wrote many valuable critical articles on other novelists; typical is his book-length study of Nathaniel Hawthorne, which has been the subject of critical debate. Richard Brodhead has suggested that the study was emblematic of James's struggle with Hawthorne's influence, and constituted an effort to place the elder writer "at a disadvantage." Gordon Fraser, meanwhile, has suggested that the study was part of a more commercial effort by James to introduce himself to British readers as Hawthorne's natural successor.
When James assembled the New York Edition of his fiction in his final years, he wrote a series of prefaces that subjected his own work to searching, occasionally harsh criticism.
At 22 James wrote The Noble School of Fiction for The Nation's first issue in 1865. He would write, in all, over 200 essays and book, art, and theatre reviews for the magazine.
For most of his life James harboured ambitions for success as a playwright. He converted his novel The American into a play that enjoyed modest returns in the early 1890s. In all he wrote about a dozen plays, most of which went unproduced. His costume drama Guy Domville failed disastrously on its opening night in 1895. James then largely abandoned his efforts to conquer the stage and returned to his fiction. In his Notebooks he maintained that his theatrical experiment benefited his novels and tales by helping him dramatise his characters' thoughts and emotions. James produced a small but valuable amount of theatrical criticism, including perceptive appreciations of Henrik Ibsen.
With his wide-ranging artistic interests, James occasionally wrote on the visual arts. Perhaps his most valuable contribution was his favourable assessment of fellow expatriate John Singer Sargent, a painter whose critical status has improved markedly in recent decades. James also wrote sometimes charming, sometimes brooding articles about various places he visited and lived in. His most famous books of travel writing include Italian Hours (an example of the charming approach) and The American Scene (on the brooding side).
James was one of the great letter-writers of any era. More than ten thousand of his personal letters are extant, and over three thousand have been published in a large number of collections. A complete edition of James's letters began publication in 2006, edited by Pierre Walker and Greg Zacharias. As of 2014, eight volumes have been published, covering the period from 1855 to 1880. James's correspondents included celebrated contemporaries like Robert Louis Stevenson, Edith Wharton and Joseph Conrad, along with many others in his wide circle of friends and acquaintances. The letters range from the "mere twaddle of graciousness" to serious discussions of artistic, social and personal issues.
Very late in life James began a series of autobiographical works: A Small Boy and Others, Notes of a Son and Brother, and the unfinished The Middle Years. These books portray the development of a classic observer who was passionately interested in artistic creation but was somewhat reticent about participating fully in the life around him.
Henry James