Deploying FastAPI Applications on Vercel: A Step-by-Step Guide 🚀

A Beginner’s Guide to Deploying FastAPI/Flask Apps on Vercel.

Absolutely, let’s dive right in and build a basic FastAPI application to get our feet wet. This will be a great foundation for exploring its functionalities further.

Local setup :

To get started, we’ll need some helpful tools. Let’s install them using pip before creating our basic FastAPI app.

pip install fastapi uvicron

# we are using uvicorn for running our FastAPI

1. create a file called app.py

#app.py

from fastapi import FastAPI

app = FastAPI()


@app.get('/')
def hello_world():
    return "Hello,World"


if __name__ == '__main__':
    import uvicorn
    uvicorn.run(app)

2. run it using the below command

python app.py

it should look like this

open http://127.0.0.1:8000/ link to see the application , it should be showing “Hello, World”

3. create a requirements.txt file

 pip freeze > requirements.txt

4. create a vercel.json file, which is necessary for vercel deployment

{
  "version": 2,
  "builds": [
    {
      "src": "app.py",
      "use": "@vercel/python"
    }
  ],
  "routes": [
    {
      "src": "/(.*)",
      "dest": "app.py"
    }
  ]
}

5. create a new repo in Gihub and upload or push all the file we have created

Vercel Dashboard steps :

1. Log into Vercel and create a new project.

in Add New… dropdown , select Project

2. import the repo in Vercel, select the repo and click on Import

3. Configure the Project, give a proper name and if you want to pass secrets, give it in Environment Variable section

-> click on Deploy

4. wait for the deployment to happen

open deployment domain link showed there

🎉 your app is deployed on Vercel, Congratulations

Thanks