Node/express postgresql stored procedure / function - node.js

Question

I want to call a stored procedure / function in postgresql from node/express. I am using Angular 5.
Installed packages:
express: 4.16.2,
pg: ^7.4.0
Other required packages are also installed
Below is the code of my API - I want to replace all queries with my stored procedure / function call
const express = require('express');
const router=express.Router();
const {Pool,Client} = require('pg');
const connectionString = 'postgresql://postgres:1#localhost:5432/dbAngular'
// const client = new Client({
// connectionString:connectionString
// })
router.get('/employees', (err, res, done) => {
const client = new Pool({
connectionString:connectionString
})
client.connect((err)=>{
if(err!=undefined)
{
console.log('connection not established message as follow '+err.message+'')
}
});
client.query('select * from getEmployees();', (err, result) => {
if (err) {
console.log(err.stack) ;
client.end();
} else {
client.end();
console.log(result.rows);
res.json(result.rows);
}
})
})
//SAVE
router.post('/employees', (req, res,next) => {
const client = new Pool({
connectionString:connectionString
})
console.log( req.body);
var employee=req.body;
const query = {
text: 'INSERT INTO employes(name) VALUES($1)',
values: [employee.name]
}
client.connect((err)=>{
if(err!=undefined)
{
console.log('connection not established '+err.message+'')
}
});
client.query(query, (err, result) => {
if (err) {
console.log('ERRROOORRRRR');
client.end();
console.log(err.stack)
} else {
console.log('SAVEEEEE');
client.end();
// console.log(res.rows[0])
res.json();
}
})
});
//delete
router.delete('/employees/:id', (req, res,next) => {
const client = new Pool({
connectionString:connectionString
});
console.log('id passed is ' + req.param.id);
client.query('DELETE FROM employes WHERE empid=($1)',[req.param.id], (err, result) => {
if (err) {
console.log('ERRROOORRRRR');
client.end();
console.log(err.stack)
} else {
console.log('SAVEEEEE');
client.end();
// console.log(res.rows[0])
res.json();
}
});
});
module.exports=router;