Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

const express = require('express');
const mysql = require('mysql');
 
const app = express();
 
console.log('Get connection ...');
 
var conn = mysql.createConnection({
database: 'phone',
host: "localhost",
user: "qwerty",
password: "123"
});
 
 
conn.connect();
 
app.post('/', (req, res) => {
   conn.query("SELECT `fio` FROM `client` WHERE `id`=6",function(error,result){
      if (error) throw error;
      res.send(result.map(item => item));
   });
});
 
app.listen(96);

async function getData(url) {
    url instanceof String && url.length ? url : '/';
  
    const options = {
      method: 'POST',
      headers: {
        'Content-Type' : 'application/json'
      }
    };
  
    let response = await fetch(url, options); 
    let data = response.json(); 
    return data;
  
  }
  
  const data = getData(); 
  console.log(data);

res.json(result)

async function getData(url = window.location.href)...

async function getData(url) {
    url = typeof url === 'string' && url.length ? url : window.location.href;
...