LangBear primarily supports Supabase as a database provider.

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Create and configure a new LangBear app with Supabase

First, navigate to Supabase and create a new project on Supabase. You’ll need to create an account if you don’t already have one. Then create a new LangBear app with the --database flag set to supabase. 
$ npx create-langbear-app my-app --database supabase
> Enter your Supabase URL: <your-supabase-url>
> Enter your Supabase key: <your-supabase-key>
The create-langbear-app command will set up your Supabase project with the tables LangBear needs.

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Configure an existing LangBear app with Supabase

If you already have a LangBear app and want to switch to Supabase, open langbear.json and set the database property to supabase. 
{
  // ...
  "database": "supabase"
  // ...
}
Open .env and set the SUPABASE_URL and SUPABASE_KEY variables. 
SUPABASE_URL=<your-supabase-url>
SUPABASE_KEY=<your-supabase-key>

NEXT_PUBLIC_SUPABASE_URL=<your-supabase-url>

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Start your app

Start your app with npm run dev and open http://localhost:3030 in your browser. 
$ npm run dev

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Custom ports

LangBear application uses port 3030 by default. You can use the PORT environment variable to customize the port LangBear application runs on. For example, use this command to run in port 3333: 
PORT=3333 npm run dev
In the next section, we’ll learn how to deploy the LangBear app to Vercel.