Example of two SEDs of SN local environments of one squared kiloparsec extracted from J-PLUS observations. On top, the star-forming environment of SN 1997dq in its host galaxy NGC 3810 clearly shows a blue continuum based on the five broad-band filters and increased flux for the narrow-band filters where the main emission lines fall. On the bottom, for SN 1957B in the Messier 84 galaxy, a smooth red continuum is seen with no bumps at the narrow-band filter wavelengths.