J-PLUS and S-PLUS synthetic photo-spectra of several emission-line objects. The DdDm 1 PN (a). A PN in the dwarf galaxy NGC 205 (b). Two CLOUDY modelled PNe with T_eff = 60 × 10³ and 200 × 10³ K, and H density of 1000 and 3000 cm⁻³, which concern the abundances of the hPN DdDm 1 and L = 10 000 L_⊙, (c, d). A H II region in the nearby galaxy NGC 55 (e). The SySt LMC 1 (f). The H II galaxy Mrk 1318 (g) from SDSS. The YSO RU Lup (h). A CV (i) from SDSS. A B[e] star (j). QSOs with redshift of 1.4 (k), z = 2.5 (l), and z = 3.3 (m), where the strong emission in the J0660 filter, is caused by the Mg  II λ2798, C III] λ1909 and C IV λ1550 emission lines, respectively. And, a star-forming galaxy (n). For this object, the Hα line is responsible for the J0660 magnitude. Squares represent the SDSS-like broad-band filters. From left to right they are u, g, r, i,   and z. Circles are the narrow-band filters, J0378, J0395, J0410, J0515, J0660, and J0861, from left to right.