A discreet but prolific writer, he published numerous works belonging to genres as varied as novel, new, poetry, essay and biography.
Among these works are a study on Montaigne, a biography of Saint-Simon and a collection of political portraits (Feu nos maîtres) (our deceased masters).
Adopting willingly the brief form, Judrin published collections of aphorisms in the minds of the moralists, small philosophical and literary portraits and poetic notations inspired by oriental wisdom (Boussoles, Ténèbres d'or, Printemps d'hiver).
He was praised by Paul Morand and Jacques Chardonne, who lauded him "an abrupt and natural writer", and was closely associated with Marcel Arland.
After Paulhan's death, he left Gallimard for Éditions de la Table ronde, which he helped to found.