How to set up image uploads in Python Flask

Set up a POST route to accept an image field:

import uuid
import os
from flask import request, Response

# specify the path where you want to keep the uploaded files
IMAGE_UPLOADS = './filestore' 

@app.route('/upload_img', methods=['POST'])
def upload_img():
    if request.method == 'POST' and request.files:
        image = request.files.get('image', False)
        if not image:
          return Response('input missing', status=400)

        new_filename = str(uuid.uuid4()) + '.' + image.filename.split('.')[-1]
        image.save(os.path.join(IMAGE_UPLOADS, new_filename))

        print('saved: ' + new_filename)
        return 'saved: ' + new_filename

On the client side:

<form action="/upload_img" method="post">
    <input type="file" name="image">
    <button type="submit">Submit</button>
</form>

If you use JavaScript to submit the request, make sure to use a POST request with Content-Type: multipart/form-data