Developing the File Upload Endpoint

File uploads are a common feature in many web applications. In FastAPI, handling file uploads is straightforward and can be achieved using the UploadFile type. This guide will demonstrate how to create a file upload endpoint in FastAPI.

Creating the Endpoint

Python

from fastapi import FastAPI, UploadFile, File

app = FastAPI()

@app.post("/upload")
async def upload_file(file: UploadFile = File(...)):
    with open(f"uploads/{file.filename}",    "wb") as f:
        f.write(file.file.read())
    return {"message": "File uploaded successfully"}

Explanation

• The UploadFile type is used to represent the uploaded file.
• The File(...) parameter indicates that the file argument is required.
• The with statement ensures that the file is closed properly after it’s written to the disk.

Storing Uploaded Files

You can store uploaded files in a specific directory or upload them to a cloud storage service like Amazon S3, Google Cloud Storage, or Backblaze B2.

Example: Storing Files Locally

Python

@app.post("/upload")
async def upload_file(file: UploadFile = File(...)):
    upload_folder = "uploads"
    file_path = os.path.join(upload_folder, file.filename)
    with open(file_path, "wb") as f:
        f.write(file.file.read())
    return {"message": "File uploaded successfully", "file_path": file_path}

By following these steps, you can effectively implement file upload functionality in your FastAPI application, allowing users to upload files to your server.