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¿Por qué no puedo recuperar datos del objeto JavaScript?

Lo que quiero hacer es leer el nombre de la propiedad de la solicitud que envío a mi servidor express.js. Así es como paso los datos json a una solicitud posterior.

 document.querySelector('#checkout').onsubmit= async e =>{ const form = new FormData(document.querySelector('#checkout')) let user = createUserInfo(form), order = { name: "Test_Name" } fetch("/checkout/create-order", { method: "POST", mode: "same-origin", redirect: 'manual', headers:{ "Content-Type": "application/json" }, body: JSON.stringify( { order: order, user: user } ) }).then(res=>{ res.ok }).then(data=>{ console.log(data) }) }

Y así es como lo leí usando express.js:

 app.use(express.json()) const YOUR_DOMAIN = 'http://localhost:4242/checkout.html'; app.post('/checkout/create-order', async (req, res) => { console.log(req.body.order.name) }

Cuando trato de leer la propiedad del nombre, aparece un error.

 C:\xampp\htdocs\server.js:9 console.log(req.body.order.name) ^ TypeError: Cannot read properties of undefined (reading 'name')
about 4 years ago · Juan Pablo Isaza
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