Jackfruit trees are generally of medium size, up to about 20 m high, although some reach 30 meters. Cylindrical round rods, up to about 1 meter in diameter. The crown is dense and thick, wide and rounded when in the open. All parts of the plant emit a thick white sap when it is injured.
Single leaf, spread, stemmed from 1-4 cm in diameter, the leaves are rather thick like skin, stiff, flat-edge, upside-down ovate to jorong (lengthwise), 3.5-12 × 5-25 cm, with the base narrowing little by little, and short, pointed or slightly pointed ends. The tapering leaves are pointed, long up to 8 cm long, easy to fall out and leave similar markings of the ring.
Jackfruit plants are monoecious, inflorescence appears on the armpits of the leaves on short and special shoots, which grow on the sides of the old stems or branches. Male flowers in a hump are mace or spindle, 1-3 × 3-8 cm, with a clear fleshy ring at the base of the hump, dark green, with yellowish pollen and faint smelling when ripe. Jackfruit flowers are called babal. After going through the age of cooking, the baby will rot (overgrown with mold) and blacken while still in the tree, before finally falling. Female flowers in single humps or in pairs, cylindrical or oval, dark green.
The compound fruit (syncarp) is a spindle-shaped elongated, often uneven, up to 100 cm long, on the outer side forming short, soft spines. 'Fruit flesh', which is actually the development of flower tents, is golden yellow when ripe, sweet-smelling, hard, fleshy, sometimes containing sweet nectar. The oval-shaped seeds until the jorong are rather flat, 2-4 cm long, covered in a thin brown skin like skin, endocarp which is hard to whitish, and soft exocarp. The seeds are not cupped.
