Actually your juniper looks good.  I believe what you are seeing is winter damage.  It seems to be mostly toward the ground level.  It is possible that mice or rabbits have done some chewing there also.  You can clip off the needles that are dead and make sure to water your evergreen on a regular basis as needed.  That is especially important in the fall as evergreens loose moisture all winter and cannot take any up as the ground is frozen.  You may want to put some temporary fencing up around the base prior to winter and maybe some loose burlap protection.  Open the drop down boxes in this link: https://extension.umn.edu/planting-and-growing-guides/protecting-trees-and-shrubs-winter