Japa did not originate in a single text or moment but grew out of the broader Vedic emphasis on the power of correctly recited sacred sound, developing into a named devotional discipline described across Hindu epic, Puranic and later tantric literature, which increasingly specified count, posture, timing and the relative merit of different modes of recitation.
As Buddhism and later Sikhism developed their own devotional cultures in dialogue with, and in some respects reacting against, the surrounding Hindu religious environment, each adapted repeated sacred recitation to its own theology: East Asian Pure Land Buddhism built an entire soteriology around nembutsu recitation of Amitabha's name as a path open even to those unable to master more demanding meditative disciplines, while Sikh scripture presents naam simran as a central, daily and lifelong practice rather than a technique reserved for advanced practitioners. The mala used to count japa, most commonly a string of 108 beads, likely developed through a combination of independent invention and cross-tradition contact across South and East Asia and is now used, with local variation in bead count and material, across Hindu, Buddhist, Sikh and Jain practice. Because a guru-given personal mantra is traditionally understood as a specific transmission from teacher to student rather than a generic technique, traditions that use this initiatory model generally treat that particular mantra as private, even while the general practice of japa itself, and many specific mantras, remain openly taught and widely known.