Hi, if I understand correctly, you need a frontend form for data entry, an API endpoint for posting the data, and the database logic for your existing app. I can help you out with that, by:
1. Creating the React component and its fetch logic
2. Creating the Express route that the frontend reaches and its business logic
3. Setting the MongoDB with a Schema if needed
4. Hooking up to the app and testing this functionality
I am a full-stack web developer with years of experience and I mostly work on React.js, [login to view URL] and MongoDB projects, so I have developed this functionality many times in the past.
Feel free to contact me for any questions and project details!