Async MongoDB Access with Motor
Connect FastAPI to MongoDB using the Motor async driver and manage connection lifecycles in the app lifespan.
Why Motor for Async MongoDB
FastAPI is an async framework. If you talk to MongoDB with a blocking driver like pymongo, every database call freezes the event loop and kills concurrency.
Motor is MongoDB's official async driver. It wraps PyMongo and exposes coroutine-based methods you can await, so the event loop stays free to handle other requests while a query is in flight.
motor.motor_asyncio.AsyncIOMotorClient— the async client.- Every I/O call (
find_one,insert_one, ...) returns an awaitable. - Higher-level ODMs like Beanie are built on top of Motor.
Installing the Driver
Install Motor and its peer dependency. Motor pulls in a compatible PyMongo automatically.
motor— async driver.fastapianduvicorn— the web layer.
For Beanie integration later you would also add beanie, but Motor alone is enough to read and write documents directly.
pip install motor fastapi uvicorn
# motor brings in a compatible pymongo wheel
# verify the install
python -c "import motor; print(motor.version)"All lessons in this course
- Async MongoDB Access with Motor
- Document Modeling with Beanie ODM
- Aggregation Pipelines and Complex Queries
- Schema Evolution and Document Migrations