Very little is known of Froissart's life and the little that is known comes mainly from Froissart's own Chronicle and his poems. Froissart originated from Valenciennes, Hainaut, and his writings suggest his father was a painter of armorial bearing. Froissart began working as a merchant but soon gave that up to become a clerk. By about age 24, he had gained significant distinction and carried with him a letter of recommendation from the King of Bohemia when he became a court poet and a kind of official historian to Philippa of Hainault, queen consort of Edward III of England.

The memoirs of his time in Philippa's service, between 1361 and 1369, were later put together with reports of other events he had witnessed, in his Chroniques ("Chronicles"). He took a serious approach to his work:

Je suis de nouveau entré dans ma forge pour travailler et forger en la noble matière du temps passé

("Again I entered my smithy to work and forge something from the noble material of time past")

He traveled around England, Scotland, Wales, France, Flanders and Spain gathering material and first-hand accounts for his Chronicle. He also went with Lionel Duke of Clarence to Milan to attend the duke's marriage to the daughter of Galeazzo Visconti. At this wedding two other significant writers of the Middle Ages were present, Chaucer and Petrarch.

After the publication of this first book, and after the death of Philippa, he enjoyed the patronage of Joanna, Duchess of Brabant among various others. He received rewards—including the benefice of Estinnes, a village near Binche and later became canon of Chimay—which were sufficient to finance further travels, which provided additional material for his work. He returned to England in 1395 but seemed disappointed by the changes since he was last there and what he viewed as the end of chivalry. The date and circumstances of his death are unknown but St. Monegunda of Chimay claims to be the final resting place for his remains although this is unverified.

The text of Froissart's Chronicles is preserved in more than 100 illuminated manuscripts, illustrated by a variety of miniaturists. One of the most lavishly illuminated copies was commissioned by Louis of Gruuthuse, a Flemish nobleman, in the 1470s. The four volumes of this copy (BNF, Fr 2643; BNF, Fr 2644; BNF, Fr 2645; BNF, Fr 2646) contain 112 miniatures painted by the best Brugeois artists of the day, among them Loiset Lyédet, to whom the miniatures in the first two volumes are attributed.

The English composer Edward Elgar wrote an overture entitled Froissart.

Jean Froissart is also known to have been one of the first to mention the use of the verge and foliot, or verge escapement in European clockworks, by 1368.

All miniatures by Loyset Liédet, unless stated.

Image:BNMsFr2643FroissartFol97vExecHughDespenser.jpg |Execution of Hugh the younger Despenser 1326. A miniature from one of the most famous manuscripts of the Chronicle.Image:BattleofSluys.jpeg|Battle of Sluys 1340 in the Gruuthuse MS.Image:Battle of crecy froissart.jpg| Battle of Crécy, 1346 From a 15th-century illuminated manuscript of Jean Froissart's Chronicles (BNF, FR 2643, fol. 165v).Image:BNMsFr2643FroissartFol97vBatNevilleCross.jpg |Battle of Neville's Cross, 1346. English victory over the Scots from the Gruuthuse manuscript.Image:John the Good king of Fra ordering the arrest of Charles the Bad king of Navarre jpg.jpg|John the Good, king of France, ordering the arrest of Charles the Bad, king of Navarre; from the Chroniques of Jean Froissart.Image:Battle-poitiers(1356).jpg|Battle of Poitiers 1356 (miniature of Froissart).Image:Jacquerie meaux.jpg|Defeat of the Jacquerie 9 June 1358 {BNF , FR 2643), fol. 226v, Jean Froissart, Chroniques, Flandre, Bruges XVe s}Image:Assassinat Etienne Marcel.jpg| The Execution of Étienne Marcel and Jean Maillard 31 July 1358. {French Wikipetia from Jean Froissart, Chroniques. Flandre, Bruges XVe s. fol. 230. (BNF , FR 2643)Image:Couronnement de Charles VI le Bien-Aimé.jpg|The crowning of Charles VI 1380. {French Wikipedia Jean Froussart 1455-1490}Image:Richard II meets rebels.jpg|Richard II of England meets rebels,1381 in the lively if pedestrian style of Loiset Lyédet from the Gruuthuse FroissartImage:Death of Wat Tyler Froissart.jpg |Death of Wat Tyler, leader of the Peasants Revolt 1381Image:Slagbijrozebeke.jpg|Battle of Roosebeke1382 {French Wikipedia} Les chroniques de Froissart, milieu du XVe siècleImage:Retours Charles VI.jpg|Après la bataille de Roosebeke Charles VI rentre à Paris à la tête de son armée. Les Parisiens négocient avec ses envoyés les conditions de leur soumission.{French Wikipedia}Les Chroniques de Jean Froissart, milieu du XVe siècleImage:Le Bal des Ardents.jpg|The Bal des Ardents, {The Ball of the Burning Men} 1393. {Jean Froissart miniature of 1450-80}Image:Nicopol final battle 1398.jpg |Battle of Nicopol, 1396, by the Master of the Dresden Prayer book from the Gruuthuse FroissartImage:Battle of Nicopol aftermath Thr masacreofthecristians revenge for rahova massacre.jpg|Execution of prisoners after the Battle of Nicopol Ms. Fr 2646, attr. to the Master of the Dresden Prayer Book