params/query/data in server

server.js

const express = require('express')

const app = express()

app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded

app.get('/:greet', (req, res) => {
  // curl http://localhost:8080/hello\?name\=kevin
  console.log('====================================')
  console.log('req.params :', req.params) // { greet: 'hello' }
  console.log('req.query :', req.query)   // { name: 'kevin' }
  console.log('====================================')
})

app.post('/:greet', (req, res) => {
  // curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" http://localhost:8080/hello\?name\=kevin
  console.log('====================================')
  console.log('req.params :', req.params) // { greet: 'hello' }
  console.log('req.query :', req.query)   // { name: 'kevin' }
  console.log('req.body :', req.body)     // { key1: 'value1', key2: 'value2' }
  console.log('====================================')
})

const server = app.listen(8080, () => console.log('listening at 8080...'))