node.jsとexpressでサーバーを起動し、ユーザからボタンをクリックされるたびに、データベースの閲覧者項目の値をインクリメントする

const express = require('express');
const mongoose = require('mongoose');
const app = express();
const port = 3000

const url = 'mongodb://localhost:27017/express-app';
const options = {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  useFindAndModify: false,
  useCreateIndex: true
};
 
mongoose.connect(url, options);

const Schema = mongoose.Schema;
const userSchema = new Schema({
  name: { type: String },
  age: { type: Number },
  address: { type: String }
});
const User = mongoose.model('User', userSchema);

const countSchema = new Schema({
  name: { type: String },
  count: { type: Number }
});
const Count = mongoose.model('Count', countSchema);

app.use(express.urlencoded({ extended: true }));
app.use(express.json());

app