Deploy a FastAPI App on Leapcell

You can deploy a FastAPI Python app on Leapcell in just a few clicks.

This quickstart uses a simple example app. You’re welcome to use your own FastAPI app instead.

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You’ll need a GitHub account to proceed. If you don’t have one, you can create on the GitHub website.

1. Fork the FastAPI example on GitHub.

Repo: FastAPI example

Here’s the app.py file from that repo, which is borrowed from the official FastAPI docs:

from typing import Union
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"Hello": "World"}

2. Create a Service in the Leapcell Dashboard and connect your new repo.

Go to the Leapcell Dashboard and click the New Service button.

On the "New Service" page, select the repository you just forked.

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To access your repositories, you’ll need to connect Leapcell to your GitHub account.

Follow these instructions to connect to GitHub.

Once connected, your repositories will appear in the list.

3. Provide the following values during creation:

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We will use uvicorn to run the FastAPI app, so ensure you add uvicorn to your requirements.txt.

Below are the basic configuration details for setting up a FastAPI service on Leapcell:

Field	Value
Runtime	Python (Any version)
Build Command	pip install -r requirements.txt
Start Command	uvicorn app:app --host 0.0.0.0 --port 8080
Port	8080

Enter these values in the corresponding fields.

4. Access Your App:

Once deployed, you should see a URL like foo-bar.leapcell.dev on the Deployment page. Visit the domain shown on the service page.

Continuous Deployments

Every push to the linked branch automatically triggers a build and deploy. Failed builds are safely canceled, leaving the current version running until the next successful deploy.

Learn more about Continuous Deployments.