# Deployment

Let's deploy the todo app to Heroku (opens new window).

# Connect to Heroku Postgres

Modify the highlighted code in the api server module to only use Postgres in production, and keep using the simple JSON db in our dev environment.

src/server/api.ts

//...

export const api = createRemultServer({
    //...
    dataProvider: process.env["NODE_ENV"] === "production" ?
        createPostgresConnection({
            configuration: "heroku"
        }) : undefined,
    //...
});

The { configuration: "heroku" } argument passed to Remult's createPostgresConnection() tells Remult to use the DATABASE_URL environment variable as the connectionString for Postgres. (See Heroku documentation (opens new window).)

In development, the dataProvider function returns undefined, causing Remult to continue to use the default JSON-file database.

# Deploy to Heroku

In order to deploy the todo app to heroku (opens new window) you'll need a heroku account. You'll also need Git (opens new window) and Heroku CLI (opens new window) installed.

Modify the project's start npm script to bind the $PORT to the port assigned by heroku.

package.json

"start": "next start -p $PORT"

Create a Heroku app.

heroku create

Set the jwt authentication to something random - you can use an online UUID generator (opens new window).

heroku config:set NEXTAUTH_SECRET=random-secret

Provision a dev postgres database on Heroku.

heroku addons:create heroku-postgresql:hobby-dev

Commit the changes to git and deploy to Heroku using git push.

git add .
git commit -m "todo app tutorial"
git push heroku main

Open the deployed app using heroku apps:open command.

heroku apps:open

Note

If you run into trouble deploying the app to Heroku, try using Heroku's documentation (opens new window).

That's it - our application is deployed to production, play with it and enjoy.

To see a larger more complex code base, visit our CRM example project (opens new window)

Love Remult? Give our repo a star.⭐

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