Why is axios post not working?

Question

JavaScript

There are two requests, get and post, respectively, the get request can take data from the db by URL, but the post request for some reason does not send them and the pending status constantly hangs. I use React Express and MongoDB.
Customer

axios.get('/newspost').then(res => {this.setState({news: res.data})})

axios.post('/newspost', item).then(res => console.log(res)).catch(err => console.log(err))

Server

app.get('/newspost', (req, res) => {
    db.allNews().then(data => res.send(data));
});

app.post('/newspost', (req, res) => {
   db.createNews(req.body).then(data => res.send(data));
});

Answer 1

The error turned out to be that in the new version of Mongoose, promises need to be written manually
mongoose.Promise = global.Promise