express sample and quick examples and descriptions of body, params, and query
This example demonstrates the differences between `req.body`, `req.params`, and `req.query` in ExpressJS, showing how each carries client data to the server. The code pairs ReactJS frontend components with Axios requests against a backend using ExpressJS and body-parser. It illustrates POST/PUT/PATCH requests sending data in `req.body`, GET/DELETE requests embedding values in URL routes via `req.params`, and GET requests appending key-value pairs through `req.query`. The metaphor of a restaurant clarifies the client-server-database relationship.