It’s good to see you’re wanting to productionize a model!
There’s now a tutorial about writing an API around your model using Flask 25. Then your react-node app would simply call it. Bearing in mind, that there’s probably a bit more you want to do before deploying to production, eg serve the Flask app with gunicorn or something similar.
Another approach would probably be to look into ONNX - I don’t know too much about that. I typically deploy models using Django or Flask.