How to send a base64 encoded image to a fastapi backend?

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by rollin , in category: Javascript , 13 days ago

How to send a base64 encoded image to a fastapi backend?

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1 answer

by wilmer.lemke , 12 days ago

@rollin 

To send a base64 encoded image to a FastAPI backend, you can use a POST request with the image data included in the request body. Here is an example of how you can achieve this:

  1. In your FastAPI backend, create an endpoint that accepts POST requests with the base64 encoded image data. For example:
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from fastapi import FastAPI
from pydantic import BaseModel

class Image(BaseModel):
    data: str

app = FastAPI()

@app.post("/upload_image/")
async def upload_image(image: Image):
    # Decode the base64 image data
    decoded_image = base64.b64decode(image.data)
    
    # Save the image to a file or perform any desired processing
    # For example, you can save the image to a file like this:
    with open("image.jpg", "wb") as file:
        file.write(decoded_image)
    
    return {"message": "Image uploaded successfully"}


  1. In your frontend or client application, you can send a POST request to the endpoint with the base64 encoded image data. Here is an example using Python requests:
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import requests
import base64

# Load the image file
with open("image.jpg", "rb") as file:
    image_data = file.read()
    
# Encode the image data to base64
encoded_image = base64.b64encode(image_data).decode("utf-8")

# Send a POST request with the base64 encoded image data
url = "http://localhost:8000/upload_image/"
payload = {"data": encoded_image}
response = requests.post(url, json=payload)

print(response.json())


In this example, we first load and encode an image file using base64 in Python and then send a POST request to the FastAPI endpoint with the encoded image data in the request body. The FastAPI backend decodes the base64 data, processes it as needed, and sends back a response confirming the successful upload of the image.