So, for example, if we request /login, it will respond with our React app, which knows how to handle that /login route. And the route handler on line 6 makes Express respond with client/build/index.html, which is the production version of our React app, to any route not defined above. This means if the server is asked for some file like a.js or static/b.css it will respond with a file with the same name and path from client/build. On line 4, we tell Express to serve static files from client/build. Add these lines just before the app.listen() line. Now, we need to add some additional lines to our Express app to make it handle Frontend Routes as expected. For example, this is my cors configuration now. Then, add a new regular expression to the array assigned to the origin option for cors to allow requests from your production URL. Go to index.js that’s in your app’s root directory. Click on Reveal Config Vars, and add your environment variables from the. This is where we define environment variables our app will use. Switch to the Settings tab and scroll to the config vars section. BTW, the production URL for the app you just created is by default Now, head over to Heroku and login to your account and click on the app you just created. To confirm it, if you run git remote -v you should see the heroku remote added to your git remotes. This will create an empty Heroku app, and an empty Git repository for it on Heroku. Then, in your app’s root directory, run heroku create. So, if you haven’t already, you need to track your app with Git. We first need to create a Heroku app, to get the production URL to configure our app to use it. You can use the -i option to login from your terminal. This will open up your browser so that you can login to your Heroku account. Now you have it there, go ahead and login by running heroku login. Then, download and install the Heroku CLI. Installing and Setting Up Heroku CLIįirst of all, if you don’t have one yet, you need to create a Heroku account. In this part, we will finally deploy our app to Heroku. However, these instances are not backed by a disk and will lose all data on a restart.In the previous part of this tutorial, How to Build a Login/Register App with the MERN Stack (Part 5): Connecting Frontend to Backend, we used React’s Context API to connect our Frontend React app to our Backend Express app. Additionally, it includes free Redis instances.
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