bunpro.jp/grammar_points
A searchable library of Japanese grammar points organized by JLPT level from N5 to N1, with brief definitions and examples for each pattern.
GrammarDictionaries and lookupApps and toolsSentence patternsJLPTJLPT N5JLPT N4JLPT N3JLPT N2JLPT N1AppsAdjectivesConditionalsParticles