Coarsely grate the zucchini and mix with salt in a bowl. Let it steep for 10-15 minutes so that the water comes out of the zucchini. Hang a colander in a bowl and line it with a fresh kitchen towel. Fill in the zucchini grated and use the cloth to squeeze the water out of the zucchini. The mass should be quite dry and lose a lot of volume.
Mix the zucchini grated with cheese, chickpea flour, finely chopped basil, chopped garlic and egg. Spread everything on an oiled baking paper to form a pizza base and bake on a preheated baking sheet or pizza stone for 8-10 minutes.
Take the pizza crust out of the oven and cover with topping of your choice. Bake for another 3 - 5 minutes.