index.js

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

app.get('/', (req, res) => {
  res.send('Hello Express!')
})

app.post('/api/users/logon', (req, res) => {
  console.log('Login post!')
  res.send()
})

app.get('/api/users/logon', (req, res) => {
  console.log('Login get !')
  res.send('login get')
})

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})

package.json

{
  "name": "mock",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start":"node index.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "express": "^4.17.1"
  }
}