clone the app and go inside of root dir run npm install
then go inside rootDir/JsonServer (inside JsonServer dir) and run
npm install
then open this dir in terminal or command prompt and run
npm run tunnel //to start ngrok tunnel
then run
npm run db //to start database server
then copy ngrok tunnel forwarding url and past in App.js
url = "https://ae06fec9c1a7.ngrok.io" + 'route' //route(YOUR_DATABASE_OBJECT_KEY)
//LIKE -> https://ae06fec9c1a7.ngrok.io/posts
then run app
expo start
then select android/ios device to run the app from options