PostgreSQL and REST API
Preconditions:
=> Download NodeJS from https://nodejs.org/en/download
=> Download and install PostgreSQL from https://www.postgresql.org/download/windows/
=> Good to have Postman installed as well from https://www.postman.com/downloads/
=> Be familiar with JavaScript from https://www.hemelix.com/scada-hmi/twincat-hmi/twincat-hmi-async-function/
Once we have installed the PostgreSQL then we can create and build REST API.
=> Fire Visual Studio Code and create a folder called RESTAPI
=> Open a terminal (Terminal | New Terminal) and run the following command
npm init -y
=> Hit enter and it will create a JSON file called package.json file under the RESTAPI folder
=> Install express framework by executing the following command
npm i --save express
=> Install PostgreSQl connector by executing the following command
npm i pg
Now create the structure of the folder of your project as you need.
=> Create file called server.js with the following content
const express = require("express");
const app= express();
const port = 3000;
app.get("/", (req, res) => {
res.send("Hello World, so far so good!");
});
app.listen(port, () => console.log(`app listening on port ${port}`));=>
