Express + React.
JS and Mongo if it’s just a proof of concept, TS and Postgres if it has some small chance of becoming a real app one day.
Zustand is my favourite simple state management solution, and it’s not too hard to swap it for Redux Toolkit later on.
If I was building something where the Django Admin Panel could be a huge advantage I’d use DRF instead, but overall for most small projects I like it less than Express.
Front End bloat doesn’t really matter when you’re just trying to get a prototype done as fast as possible.