My tops layer in my big compost trash bin is leaves. I opened up and took off the lid today (had it on to avoid waterlogging in all the recent rain) and some of the leaves are covered in little white eggs, evenly spaced. On some of the wetter leaves, the eggs appear brownish.

What is it? *panic*

If any form of organic matter is decomposing in your compost bin or stockpile, don't worry about it. That's normal and fine. Compost happens!

Composting is more than rotting organic matter into humus or insoluble forms of nutrients for your soil and growing plants. Composting is also biology! It takes billions of beneficial aerobic microbes, and various species of larger aerobic soil/composting organics (like soldier fly larvae, millipedes, centipedes, maggots, earthworms, etc.), in order to make good health, rich, pleasant smelling compost.

Also long as you have far more brown matter than green matter, and more plant matter than any form of animal matter in your piles or bins, and constant aeration and moisturization, you are on your way to good successful aerobic composting, for any of your gardening needs.