req object with express causes UnhandledPromiseRejectionWarning - node.js

Question

I have adapted the below code from Google's Datastore tutorial. I'm vaguely aware of Promises, and I'm using await where I can figure out to do so. I've used the req object with express as below without incident, but it seems to be empty here.
It causes this error:
2021-04-16 04:55:03 default[20210415t215354] (node:10) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'name' of undefined
[SNIP]
name is a reference to a param I'm specifying like this:
curl -X POST https://MYURL/gizmos --data 'name=foo&type=bar&len=29'
What am I doing wrong? How do I avoid this?
/**
* #param {object} gizmo The gizmo record to insert.
*/
const insertGizmo = gizmo => {
return datastore.save({
key: datastore.key('gizmo'),
data: gizmo,
});
};
/**
* Retrieve the latest gizmo
*/
const getLastGizmo = () => {
const query = datastore
.createQuery('gizmo')
.order('createTime', {descending: true})
.limit(1);
return datastore.runQuery(query).then( (entities) => {
return entities[0].map(fromDatastore);
});
};
//Create a Gizmo
app.post('/gizmos', async (req, res, next) => {
const createTime = new Date();
const gizmo = {
name: req.body.name,
type: req.body.type,
length: req.body.len,
createTime: createTime,
};
try {
await insertGizmo(gizmo);
const newGizmo = await getLastGizmo();
//const [newGizmos] = await getLastGizmo();
await insertGizmo(gizmo);
const newGizmo = await getLastGizmo();
//const [newGizmos] = await getLastGizmo();
const gizmoUrl = "https://MYURL/gizmos/"+newGizmo.id;
const resText = {
"id" : newGizmo.id,
"name" : newGizmo.name,
"type" : newGizmo.type,
"length" : newGizmo.length,
"self" : gizmoUrl,
};
res.status(201).set('Content-Type', 'text/plain').send(resText).end();
} catch (error) {
next(error);
}
});

Answer 1

Per #hoangdv, add app.use(express.urlencoded()) somewhere. Rather node-ish not have it as the default if you ask me.