Lyα luminosity functions for each of the NB filters we used in our study (coloured squares). The grey shaded areas show the Lyα luminosity limit (vertical limit) and the limiting number density measurable by J-PLUS (horizontal limit). The wide area explored by the NBs of the J-PLUS survey allow us to remarkably extend the range of luminosity sampled by previous studies (coloured circles, triangles, hexagons, and diamonds in each plot) and to explore previously unconstrained L_Lyα intervals. Dashed lines mark the best-fit determinations by Sobral et al. (2018a), split respectively into a Schechter (light green) and a power-law contribution (dark green). Our results provide tight constraints at 44.5 ≲ Log (L_Lyα/erg s⁻¹)≲45.5, a regime currently unexplored by previous Lyα LFs determinations. Our errors are dominated by the completeness correction at low luminosity, while poor statistics due to low number counts (i.e. Poissonian errors) dominate the bright tail of our distributions.