Change the Node.js GET /POST requests to the Ajax

I'm a beginner in JavaScript and working to make the same request from some Node.js backend code to by using the Ajax based GET/ POST requests. I use MySQL database. I have gone through some tutorials and get some understanding. For example, an Ajax POST request could be something like,

    $.ajax({

            url: '/walletinfo',
            method: 'POST',
            data: {
                name: addressName,
                address: wallet.getAddress()
            },
            success: function(result) {
                console.log(result)
            },
            error: function(err) {
                console.log(err)
            }
        }) 

The Node.js POST requests that I have is provided,

// initiations of the code 
const express = require('express')
const path = require('path')

const bodyParser = require("body-parser");

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

const con = mysql.createConnection({

    host: "localhost",
    user: "testuser",
    password: "testpassword",
    database : 'wallet1'
});

con.connect(function(err) {

  if (err) throw err;
  console.log("Connected!");
});


app.use('/', express.static(path.join(__dirname, 'public')))
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());


// initiations of the code
app.post('/walletinfo', function (req, res) {

    var sql = "INSERT INTO wallet_info (name, address) VALUES ('" + req.body.name +"', '" + req.body.address + "')";

    con.query(sql, function (err, result, fields) {
        if (err) console.error(err);

        res.json(result)
  });
})

So, its seems that the req object build-up the SQL query and the con.query tries to execute it. If the INSERTION is done as expected, we embedded the res with the result.

It seems I have to do something with the data: { name: addressName, address: wallet.getAddress() } part of the $.ajax request and make the con.query call over there.

I also have a GET request to change from Node to the Ajax,

app.get('/walletinfo', function (req, res) {

    con.query("SELECT * FROM wallet_info", function (err, result, fields) {

        if (err) throw err;

        console.log(result);
        res.json(result)
  });
})

How to do it properly?

Copyright Notice：Content Author:「Arefe」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/45480631/change-the-node-js-get-post-requests-to-the-ajax