Combine the zucchini, sugar, pineapple, and lemon juice in a large pot over medium heat. Boil mixture until the zucchini is clear; remove from heat. Add gelatin mix and stir until completely dissolved.
Ladle into hot, sterilized jars to within about 1/4 inch of the top. Seal, and process in a boiling water canner for 5 minutes.
