server.js

'use strict';
const express = require('express');
let app       = express();
let server    = app.listen(3000);

app.use(require('body-parser').urlencoded({ extended : true }));

app.get('/', (req, res) => {
  res.send(`
    <form method="post" action="/">
    <input type="text" placeholder="Enter Tag here" class="gui-input" name="reply_message">
    <input type="text" placeholder="Enter Label for Decision" class="gui-input" name="decision[0][label]" value="Interested">
    <input type="text" placeholder="Enter decision keywords here" class="gui-input" data-role="tagsinput" name="decision[0][keyword]" value="Interested, call me">
    <input type="text" placeholder="Enter Label for Decision" class="gui-input" name="decision[1][label]" value="Not Interested">
    <input type="text" placeholder="Enter decision keywords here" class="gui-input" data-role="tagsinput" name="decision[1][keyword]" value="not interested, not">
    <input type="text" placeholder="Enter Label for Decision" class="gui-input" name="decision[2][label]" value="Call Later"  >
    <input type="text" placeholder="Enter decision keywords here" class="gui-input" data-role="tagsinput" name="decision[2][keyword]" value="Interested, call me, later">
    <button class="button btn-primary" type="submit">Submit </button>
  `);
});

app.post('/', (req, res) => {
  res.send(`<pre>${ JSON.stringify(req.body, null, 2) }</pre>`);
});