To install FastAPI you need to have prerequisite installed on your system, which are following:

Requirements

• Python 3.6 + 
  To install Python, head over to Python official website and follow the instructions.

Installing FastAPI

FastAPI is very flexible in terms of how you want to install it. You can do a custom installation and install dependency as per your need.

Recommended installation

The most recommended way to install FastAPI is to install all of its dependencies in one go:

pip install "fastapi[all]"

Custom installation

Alternatively, You can also install FastAPI part by part.

This is what you would probably do once you want to deploy your application to production:

pip install fastapi

Also install uvicorn to work as the server:

pip install "uvicorn[standard]"

And the same goes for each of the optional dependencies that you want to use.