Context An Express API endpoint receives POST requests with a JSON body but the request body is always undefined. The Problem The express.json() middleware is not configured, so incoming request bodies are never parsed. Current Code app.post("/users", (req, res) => { console.log(req.body); // undefined res.sendStatus(200); }); Constraints Add the express.json() middleware globally before route definitions. Validate that required fields (name, email) are present in the body. Return a 400 error with a message if validation fails. Expected Deliverable An Express endpoint correctly parsing JSON request bodies, with basic field validation and appropriate error responses.