how to use forms with express code example

Example 1: post express node js input

<form method="POST" action="/submit-form">
  <input type="text" name="username" />
  <input type="submit" />
</form>

Example 2: post express node js input

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

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