Yearly Archives: 2021

JavaScript ES6 Useful Examples

In the examples below we show useful javascript ES6 examples which are very valuable Including: Array Loop and Slice Regular expression, replaces all blanks & special characters Object Keys & Values Object Map Math Sign Palindrom example Every & Some Array map elements Array Foreach loop map, filter, find reverse String balanceParser example //////Loop and […]

How to add SEO Meta Title & Description in your Website

SEO Meta Title and Description are basics and MUST HAVE settings for your website.   For adding those you must put below between  <header> </header> tags in your HTML page like the codes I put for my website:   <head> <title>Tips for Programming, Sysadmin, GIS, SEO | Full Stack Logs </title> <meta name=”description” content=”Full Stack […]

Reactjs and axios example: submit async post API request

In the example below we show how to call Post API using Axios asynchronously in React functional component.   We utilise “useState” for creating a state variable pass its value to the post request:   import React, { useState } from “react”; import axios from “axios”; const PostCreate = () => { const [title, setTitle] […]

Create HTTP Get and HTTP Post Server using Nodejs and express

For creating Http Get or Http Post Server using Nodejs (Not consuming Get or Post) Follow instructions below: First Create a Nodejs project by running:   npm init -y   Then install express and body-parser dependencies by running   npm i express body-parser   Now create and edit the index.js file and add below code […]

Install R Shiny Server in Ubuntu behind Nginx Proxy

For installing and serving R Shiny Server behind Nginx reverse proxy we first install it by: sudo apt-get install r-base sudo su – \ -c “R -e \”install.packages(‘shiny’, repos=’’)\”” sudo apt-get install gdebi-core sudo gdebi shiny-server- Before installing some R Shiney packages we should install: sudo apt-get install libssl-dev libcurl4-openssl-dev Then we can install R […]

Install and Serve Konga-Kong Admin UI Behind Nginx Reverse Proxy

For installing and serving Konga behind Nginx reverse proxy we first clone the project and install npm modules and run :   git clone   cd konga   npm i   npm run start   It is time to add the reverse proxy in Nginx as below:   sudo vim /etc/nginx/nginx.conf server { location […]

Serve Create React app behind Reverse Proxy Nginx or Apache and Pm2

For serving React app behind reverse proxy such as Nginx or Apache We first create an application using create-react-app Create a react app using npx like: npx create-react-app portal Then install serve node package like: npm install -g serve Then you need to update the package.json and add two lines below (assume we want to […]

Install SSL Certificate for NGINX in Ubuntu

For installing SSL certificate for Nginx in Ubuntu you need to have two files: SSL crt file and SSL private key file and then put inside the server section in nginx.conf like the example below:   sudo vim /etc/nginx/nginx.conf server { listen 443 ssl; ssl_certificate /PATH_TO_SSL_CRT_FILE.crt; ssl_certificate_key /PATH_TO_SSL_PRIVATE.key; server_tokens off; root /var/www; server_name; client_max_body_size […]

How to run Ubuntu Tomcat in Port 80 HTTPS & install SSL for Tomcat

First you need to run below commands:     sudo touch /etc/authbind/byport/80   sudo chmod 500 /etc/authbind/byport/80   sudo chown tomcat8 /etc/authbind/byport/80   Then you need to add AUTHBIND=yes in /etc/default/tomcat8   Here you can change the JAVA_HOME & JAVA_OPTS: JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64   JAVA_OPTS=”-Djava.awt.headless=true -XX:+UseConcMarkSweepGC -Xms512m -Xmx4G -XX:PermSize=512M -Dorg.owasp.esapi.resources=/var/lib/tomcat8/webapps/ROOT/WEB-INF/classes/” AUTHBIND=yes   Then you need to change […]

Geoserver in tomcat behind NGINX Reverse Proxy and SSL

Assuming the Geoserver war file is running inside tomcat in port 7000 like: localhost:7000/geoserver Also a valid SSL certificate has configured in NGINX. First you need to change Tomcat port and add proxyPort in server.xml  :   sudo vim /etc/tomcat8/server.xml   Then search for “Connector port” and change the port number and also proxyPort to […]