API Connection through node in React Form - node.js

Question

const express = require('express');
const mysql = require('mysql');
const app = express();
const bodyParser = require('body-parser');
var cors = require('cors');
app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
function getConnection() {
return mysql.createConnection({
host: 'localhost',
user: 'root',
database: 'pms_tool'
})
}
//DEL REQUEST
app.delete('/users/:kpiId', (req, res) => {
console.log('Fetching user with kpiId: ' + req.params.kpiId);
const connection = getConnection();
const Id = req.params.kpiId;
const queryString = 'DELETE FROM kpi_master WHERE kpiId = ?';
connection.query(queryString, [Id], (err, rows, fields) => {
if (err) {
console.log('Failed to query for users: ' + err);
res.sendStatus(500);
return;
}
res.end('Record has been deleted!!!');
});
});
//update kpi api
app.put("/kpi_update/:kpiId", (req, res) => {
const id = req.params.kpiId;
const name = req.body.kpiName;
const description = req.body.description;
const queryString = " UPDATE kpi_master SET kpiName = ? , description = ? WHERE kpiId = ? "
getConnection().query(queryString, [name, description, id], (err, results, fields, rows) => {
if (err) {
console.log("Not updated " + err);
res.sendStatus(500);
return
}
console.log('record updates ' + results.id)
res.send(results)
})
})
//create a new kpi
app.post('/user_create', (req, res) => {
console.log('Trying to create a new user...');
console.log('first name: ' + req.body.kpiName);
const kpiName = req.body.kpiName;
const description = req.body.description;
const queryString = 'INSERT INTO kpi_master (kpiName,description) values(?,?)';
getConnection().query(queryString, [kpiName, description], (err, results, fields) => {
if (err) {
console.log('Failed to insert new user :' + err);
res.sendStatus(500);
return;
}
console.log('Inserted a new user with id:', results.insertId);
res.end();
});
res.end();
});
app.get('/', (req, res) => {
console.log('Responding to root route');
res.send('Hello from ROOT');
});
//get kpi by single ID
app.get('/users/:kpiId', (req, res) => {
console.log('Fetching user with kpiId: ' + req.params.kpiId);
const connection = getConnection();
const userId = req.params.kpiId;
const queryString = 'SELECT * FROM kpi_master WHERE kpiId = ?';
connection.query(queryString, [userId], (err, rows, fields) => {
if (err) {
console.log('Failed to query for users: ' + err);
res.sendStatus(500);
return;
}
console.log('I think we fetched users successfully');
const users = rows.map((row) => {
return { kpiName: row.kpiName, description: row.description };
});
res.json(users);
});
// res.end()
});
//get kpi
app.get('/users', (req, res) => {
const connection = getConnection();
const queryString = 'SELECT * FROM kpi_master';
connection.query(queryString, (err, rows, fields) => {
if (err) {
console.log('Failed to query for users: ' + err);
res.sendStatus(500);
return;
}
res.json(rows);
});
});
const port = 5000;
app.listen(port, () => `Server running on port ${port}`);
It gives me the error as I've shared the image
I've made one datatable for listing records and on add we can add it through api. So now I've made api and add some records and made a file named server for api and it's working but i've called api in react form but can't able to list the api. As it shows this error...

Answer 1

I think your node_module for mysql is not installed in your node application. Kindly install it using
npm i mysql
and then restart your application again
Thank You.