On the night of the Potters' murder, James was the one who saw Voldemort coming, and sacrificed his life so Lily could attempt to escape with Harry. Rowling describes James as having hazel eyes, a slightly longer nose than Harry's, but otherwise the same thin face, same hands, same untidy black hair sticking up at the back, and (nearly) the same height as Harry during their school days. He was born 27 March, 1960 and attended Hogwarts 1971 to 1978 where he was in Gryffindor. In Harry Potter and the Prisoner of Azkaban it is revealed that his best friends were Sirius Black, Remus Lupin and Peter Pettigrew, and that the four were known as The Marauders. They gave themselves nicknames: Remus was "Moony", Sirius was "Padfoot", James was "Prongs", and Peter was "Wormtail". They illegally became Animagi to keep Remus company when he transformed into a werewolf in the Shrieking Shack. Sirius became a black dog, James became a stag, and Peter became a rat. Harry's patronus takes the form of a stag, clearly a likeness of "Prongs".Characters in the book have commented on the personality of James. Severus Snape considers him "exceedingly arrogant" whereas Remus calls him "the height of cool" and Sirius as "sometimes an arrogant little berk". Scenes from James's time at Hogwarts have shown him behaving as a bully towards Snape. In Harry Potter and the Order of the Phoenix, after seeing Snape's memories of James within a pensieve, Harry agrees with Snape's assessment of his father's arrogance, and the revelation leaves Harry deeply depressed and disheartened. However, he saved Snape's life after Sirius had attempted to goad Snape into the Shrieking Shack, where Lupin was transforming. In Harry Potter and the Deathly Hallows, Harry witnesses James meeting Snape (and Sirius) for the first time when they board the Hogwarts Express in one of Snape's memories. James displays clear dislike for Snape's hopes that he and Lily would both be placed in Slytherin (coming from the fact that James hated all Dark Arts). Even so, he thought that Sirius was "all right", even though he finds out that the entire Black family was in Slytherin. Snape, for his part, thinks that James is silly to want to be in Gryffindor, since he believes that students in that house are all "brawny but not brainy". According to J.K. Rowling in a recent interview: "James always suspected Snape harboured deeper feelings for Lily, which was a factor in Jamesí behaviour to Snape". James was a brilliant student, and in Harry Potter and the Philosopher's Stone, he is said to have become Head Boy, although in Harry Potter and the Order of the Phoenix it is said that Remus was the prefect, not James, although he may simply have become Head Boy by the seventh year if he had matured and become more responsible and sensible. He was also a player on the Gryffindor Quidditch team. In the film version of Philosopher's Stone, Harry and his friends find James' name listed on a plaque as a Seeker on his Quidditch team. He was shown playing with a Golden Snitch outside of games and practices [HP5], ostensibly to show off. He similarly had a habit of rumpling up his hair to produce the effect that he had just stepped off a broomstick. James' wand was 11 inches, made of mahogany, pliable and excellent for Transfiguration. James and Sirius were apparently popular students, ingenious pranksters and very witty. Madam Rosmerta of the Three Broomsticks pub in Hogsmeade, once talked fondly of how the two boys used to come into her bar, joke with her, and make her laugh. The two also proved intelligent enough to learn how to become Animagi.
It was revealed in Harry Potter and the Deathly Hallows that James was a descendant of Ignotus Peverell and thus inherited the Cloak of Invisibility. The epilogue also mentions that Harry names his first son James.*This information was taken from the Wikipedia.org website.