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Update Node on Mac and Windows

Using brew: brew update brew upgrade node Using nvm:   NVM (Node Version Manager) is a tool that allows you to manage multiple versions of Node on your system. You can use nvm to install, update, and switch between different versions of Node. To update your version of Node using nvm, do the following: 1. Check if you already have nvm installed on your system:   
nvm --version 2. If it's not installed, install nvm using this command:    
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash 3. Once nvm is installed, check your current version of Node by running the following command: 
node -v 4. Then update your version of Node using the following command:   
nvm install node --reinstall-packages-from=node 5. And finally, verify that your update is complete by rechecking your Node version:   
node -v ———————————————————————————————————— Using NPM: To update Node using NPM, do the following: 1. Open the Terminal and check your curren...

NGrok Setup

 https://dashboard.ngrok.com/get-started/setup 1. Unzip to install On Linux or Mac OS X you can unzip ngrok from a terminal with the following command. On Windows, just double click ngrok.zip to extract it. unzip /path/to/ngrok.zip 2. Connect your account Running this command will add your authtoken to the default ngrok.yml configuration file. This will grant you access to more features and longer session times. Running tunnels will be listed on the endpoints page of the dashboard. ngrok config add-authtoken 1woFn9zVqcI4VeGuSIiN2VtmnPa_ZXuAuF1AAPkqApr7WVsQ 3. Fire it up Read the documentation on how to use ngrok. Try it out by running it from the command line: ngrok help To start a HTTP tunnel forwarding to your local port 80, run this next: ngrok http 80

Android emulator not able to access the internet

Change the DNS address of your network to 8.8.8.8 (Google's DNS) or another of your preference: MacOSX: Open "System Preferences" Click on "Network" Select the network which your computer is connected and click on "Advanced" Select "DNS", Select the "+" button, type "8.8.8.8" (Google's DNS) or if you prefer OpenDNS, "208.67.222.222" Select "Ok" and "Apply" Windows & Linux: https://developers.google.com/speed/public-dns/docs/using After that close the emulator and start it again. URL :  https://stackoverflow.com/questions/42736038/android-emulator-not-able-to-access-the-internet

REST

REST stands for REpresentational State Transfer and is used to access and manipulate data using several stateless operations. These operations are integral to the HTTP protocol and represent an essential CRUD functionality (Create, Read, Update, Delete). The HTTP operations available are: POST (create a resource or generally provide data) GET (retrieve an index of resources or an individual resource) PUT (create or replace a resource) PATCH (update/modify a resource) DELETE (remove a resource)

React JS

Installation  npm install - g create - react - app create - react - app my - app - name cd my - app - name npm start OR npx create-react-app myapp cd my - app - name npm start

Web Servers

There are 4 primary  web servers : Apache (provided by Apache) IIS (provided by Microsoft) nginx (provided by NGINX, Inc. and pronounced like “Engine X”) and GWS (provided by Google and short for Google  Web Server )