COVID vaccines do not contain microchips. Even the world’s tiniest microchip is way too big to go through a syringe.
The ingredients in the COVID vaccines are similar to other vaccines. They each contain an active ingredient – mRNA in the case of Pfizer and Moderna and a disabled fragment of a common cold virus in the case of Johnson & Johnson – that trains your body to recognize and fight the COVID virus. Along with the active ingredient, the vaccines have inactive ingredients like salts, sugars, and fats. These inactive ingredients are widely used in other medications or in food.
Vaccines are developed to fight against disease and are not administered to track your movement.
Vaccines work by stimulating your immune system to produce antibodies, exactly like it would if you were exposed to the disease, but without the risk of actual infection. After getting vaccinated, you develop immunity to that disease, without having to get the disease first.
https://www.uclahealth.org/u-magazine/what-s-in-that-covid-19-vaccine (UCLA Health)