Linked from
The 10 pages that link to Japa, each with the reason it gives.
BhaktiRelated: Repetition focuses devotion on a deity’s name.
Bhakti yogaRelated: Repeating a deity’s name can focus attention and express devotion.
Gayatri MantraRelated: Repetition is a common practice for engaging with the mantra.
JapamalaRelated: Japamala beads provide a tactile count during this repeated recitation.