Running Tasks On StartUp and Shutdown using FastAPI Lifespan Events

FastAPI is a modern web framework for building APIs with Python. It provides a convenient way to run tasks on startup and shutdown using lifespan events. This allows developers to perform certain actions when the application starts and stops.

Startup Tasks

Startup tasks are actions that need to be performed when the application is first started. This can include setting up database connections, loading configuration files, or initializing background processes.


from fastapi import FastAPI

@app.on_event("startup")
async def startup_event():
print("Starting up the application")
# Perform startup tasks here


Shutdown Tasks

Shutdown tasks are actions that need to be performed when the application is stopped. This can include closing database connections, saving state information, or cleaning up resources.


from fastapi import FastAPI

@app.on_event("shutdown")
async def shutdown_event():
print("Shutting down the application")
# Perform shutdown tasks here


By using the on_event decorator in FastAPI, developers can define functions that will be executed on startup and shutdown of the application. This provides a clean and organized way to manage tasks that need to be run at specific points in the application lifecycle.

Next time you are working on a Python API project with FastAPI, remember to take advantage of lifespan events to run tasks on startup and shutdown.