Nitrogen-containing　motifs　are　widely　present　in　natural　products,　bioactive　molecules,　and　drugs.　Accordingly,　effective　synthetic　methods　with　high　efficiency　and　diversity　are　highly　desirable.　Here,　we　present　the　invention　of　a　facile,　visible　light-mediated　decarboxylative　C(sp3)-N　bond-forming　reaction　by　employing　abundant　carboxylic　acids　as　the　feedstock　and　a　commercial　diazirine　as　a　nitrogen　donor.　This　process　is　amenable　to　access　both　imines　and　diaziridines,　as　the　corresponding　masked　amines　and　hydrazines,　through　a　selectable　single　or　double　nitrogen　transfer　from　the　diazirine,　respectively.　This　divergent　approach　works　well　in　both　directions　with　various　alkyl　carboxylic　acids,　including　primary,　secondary,　and　tertiary　acids,　as　well　as　natural　products　and　drugs,　thus　affording　a　rapid,　metal-free　approach　to　build　nitrogen-containing　molecule　libraries　with　considerable　structural　diversity,　which　could　thus　benefit　the　related　study　in　context　of　chemical　biology　and　drug　discovery.　[Figure　not　available:　see　fulltext.]　©　2021,　Science　China　Press　and　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.