How do I install fastapi in Python?

The standard way to install fastapi is by running `python -m pip install fastapi`. If you are using Anaconda, use `conda install -c conda-forge fastapi`.

Why causes the 'No module named fastapi' error?

This error occurs when the python interpreter cannot locate the `fastapi` package. It is often caused by missing installation or environment mismatch (e.g. installing in global but running in venv).

How to fix ModuleNotFoundError: No module named 'fastapi'

ModuleNotFoundError: No module named 'fastapi'

For web development, always isolate your dependencies in a virtual environment.

Using Docker? Ensure you add `fastapi` to your `requirements.txt` and rebuild the container.

python -m pip install fastapi

Verification

Command

python -c "import fastapi; print(fastapi.__version__)"

Expected output

Success! fastapi version x.y.z (e.g., 2.4.0)