Modulenotfounderror: no module named ‘fastapi’ [SOLVED]

Facing this error message modulenotfounderror: no module named ‘fastapi’ might be frustrating when you don’t know how to solve it. Especially if you are new to programming, don’t worry; it has a simple solution.

In this article, we will provide an effective solution to this error no module named fastapi.” Aside from the solution, we’ll explain what this error is all about and how to troubleshoot with a comprehensive guide.

We want you to understand this error thoroughly so that the next time you encounter it, you will know how to fix it. So, continue to read on to discover different solutions.

What is the modulenotfounderror: no module named ‘fastapi’ error?

ModuleNotFoundError: No module named 'fastapi

The modulenotfounderror: no module named ‘fastapi’ is an error message in Python that usually happens when the required module in a Python script cannot be found by the Python interpreter. The reason is that it is not installed on the system or that it is not found in the Python environment.

In addition to that, the error occurs when you try to import the “fastapi” module in your Python code, but the module is not installed on your system.

In order to resolve this error, you have to install the “fastapi” module in your Python environment using a package manager.

What are the causes of modulenotfounderror: no module named ‘fastapi’ error?

These are the common causes why you are encountering modulenotfounderror: no module named ‘fastapi that needs to be addressed.

  • 1. The “fastapi” module is not installed
  • If the “fastapi” module is not installed in the Python environment. Definitely, Python interpreter is unable to find the required module which results in an error.
  • 2. Incorrect installation
  • If you already installed the “fastapi” module but didn’t follow the proper installation procedure or it is being corrupted you will encounter this error.
  • 3. Incompatible version
  • If you are using a different version of Python and the module you want to import is in a different version, an error will arise. The reason is that it is not compatible with the version of the “fastapi” module you are using.
  • 4. Virtual environment issue
  • When you install the module or the package globally and not in your virtual environment. Certainly, in this error modulenotfounderror: no module named ‘fastapi’ occurs.
  • 5. Import incorrectly
  • If the fastapi” module is not imported correctly in the Python environment. It will display an error, you should make sure that you are importing the correct spelling of the module.
  • 7. Conflicting modules
  • If you have installed multiple versions of “fastapi” module on your system, it may cause conflicts that result in an error.

How to fix modulenotfounderror: no module named ‘fastapi’ ?

Time needed: 2 minutes.

Here are the solutions to fix modulenotfounderror: no module named ‘fastapi’ error:

  1. Check “fastapi” module

    To check the module if is installed or not use the following commands:

    pip list
    pip freeze
    pip list -v

    The commands above will display a list of packages or modules if you do not see the “fastapi module. Then, you have to install it.

  2. Install the fastapi module

    You can easily install the fastapi module by executing the following command in your terminal or command prompt:

    Python 2
    pip install fastapi

    Python 3
    pip3 install fastapi

    conda install -c conda-forge fastapi

    Jupyter Notebook
    !pip install fastapi

    Py alias (Windows)
    py -m pip install fastapi

    When you get permissions error
    sudo pip3 install fastapi
    pip install fastapi –user

    When you don’t have pip in your PATH environment variable
    python -m pip install fastapi

  3. Check the module if it is installed

    To check if the module is successfully installed you use the following command:

    pip3 show fastapi

    This command will show information about the module that includes the version and location.

  4. Check versions

    If the error still exists, you have to check their version; maybe they are not compatible.

    To check the Python version, use this command:
    python –version

    To check the module version, use this command:
    pip3 show fastapi

  5. Upgrade fastapi module version

    To upgrade the version of the fastapi module, you can use the following command:

    pip3 install fastapi –upgrade

Additional solution to resolve modulenotfounderror: no module named ‘fastapi’

When the solutions above do not resolve the error, you can use the following commands:

Reinstalling the “fastapi” module

If the above solutions still, do not resolve the error. You can try to reinstall the module with the following command:

To uninstall:
pip uninstall fastapi
pip3 uninstall fastapi

To reinstall:
pip install fastapi
pip3 install fastapi

Install the package in a Virtual Environment

You have to ensure that the “fastapi” module is installed in your virtual environment and not globally when you are using a virtual environment.

To activate Venv on Windows (cmd.exe)

To activate Venv on Windows (PowerShell)

To activate venv on Unix or MacOS
source venv/bin/activate

You have to use the correct version of Python when creating VENV

python3 -m venv venv
python -m venv venv
py -m venv venv


This article has given you different solutions to resolve the modulenotfounderror: no module named ‘fastapi’ error message that disturbs you when running your program in Python. By executing all the effective solutions, it will help you resolve the error in no time.

We also have solutions if you encounter an error like “modulenotfounderror: no module named ‘gurobipy’.” You can also visit our website for additional information.

Thank you very much for reading until the end of this article. Just in case you have more questions or inquiries, feel free to comment.

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