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Deploy to a Server on Heroku


This guide assumes the following:

  1. That you already have an Heroku account
  2. That you’ll be using the Heroku Postgres addon (since Heroku does not provide sqlite as a suitable addon)
  3. That the application is a completely new application created using the Blitz CLI.
  4. That deployments will be made with git and the Heroku CLI.

In Heroku:

  1. Create a new application in your desired region
  2. Attach the Heroku Postgres addon to your application.

In your terminal:

  1. Login to Heroku using
heroku login
  1. Add your Heroku app as a git remote with the following command replacing <APP_NAME> with the name you provided or that was given to you when creating the Heroku app.
heroku git:remote --app <APP_NAME>

In your Blitz application:

  1. Configure the application to use postgres instead of the default sqlite by following the “Switch to PostgreSQL” guide.
  2. In your package.json add a start:production and a build command. We'll call the start script in the Procfile below. And Heroku will run the build script for you on deploy.
"scripts": {
+ "start:production": "blitz start --port $PORT",
+ "build": "blitz build"
  1. Create a Procfile file inside the root of your project with the following content.
release: npx blitz prisma migrate deploy
web: npm run start:production

Deploy using git:

With these changes committed, to deploy your application, run:

git push heroku main

Once built you can open your application with the following command in your terminal

heroku open

Note: While the application should now be working you will not be able to use authentication until you provide Heroku with a SESSION_SECRET_KEY envivonment variable. You can do this with the following command replacing <MY_SECRET> with your secret (at least 32 characters long). On macOS and Linux, you can generate it by running openssl rand -hex 16 in your terminal.


SSL Certificates

On the free tier, Heroku does not supply you with SSL certificates. These are crucial for secure authentication, though - and Blitz' built-in authentication won't work without. You can use Cloudflare SSL to get free SSL certificates.

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