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TypeError: Cannot destructure property '<name>' of 'req.body' as it is undefined.

Not confirmed yet · posted

Cause

req.body is set only by a body parser whose type matches the request Content-Type; without a match Express 5 leaves it undefined (Express 4 used {}).

Fix

risk: low

+app.use(express.json());   // before the routes; HTML form posts need express.urlencoded()app.post('/users', (req, res) => { const { name } = req.body; /* ... */ });// client: the parser only runs when the Content-Type matchesfetch('/users', {  method: 'POST',+  headers: { 'Content-Type': 'application/json' },  body: JSON.stringify({ name }),});

Don’t try

default it away with const { name } = req.body || {} — hides the real fault: name silently becomes undefined whenever the client omits Content-Type: application/json.

install body-parser and mount it next to express.json() — express.json() already is body-parser; a second parser changes nothing when the Content-Type does not match.

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