CoverLetterGPT.xyz

Running it locally

After cloning this repo, you can run it locally by following these steps:

1. Install Wasp by running curl -sSL https://get.wasp-lang.dev/installer.sh | sh in your terminal.
2. Create a .env.server file in the root of the project
3. Copy the env.server.example file contents to .env.server and fill in your API keys
4. Make sure you have a Database connected and running. Here are two quick options:

• run wasp start db from the project root. You need to have Docker installed (if not, on MacOS run brew install docker-machine docker and start the Docker app). This will start a Postgres database and configure it for you. No need to do anything else!
• or provision a Postgres database on Railway, go to settings and copy the connection url. Paste it as DATABASE_URL= into your env.server file.

5. Run wasp db migrate-dev
6. Run wasp start
7. Go to localhost:3000 in your browser (your NodeJS server will be running on port 3001)
8. install the Wasp extension for VSCode for the best DX

How it works

coverlettergpt.xyz was built in a couple of days using a few really cool tools:

• 🐝 Wasp - allows you to build full-stack apps with 10x less boilerplate
• 🎨 Chakra-ui - UI components for React that look good and are easy to work with
• 🤖 OpenAI - GPT-3.5 turbo and GPT-4 API
• 💸 Stripe - for payments
• ⚡️ Lightning / Bolt11 - for Bitcoin Lightning payments

Wasp as the full-stack framework allows you to describe your app’s core features in the main.wasp config file in the root directory. Then it builds and glues these features into a React-Express-Prisma app for you so that you can focus on writing the client and server-side logic instead of configuring. For example, I did not have to use any third-party libraries for Google Authentication. I just wrote a couple lines of code in the config file stating that I want to use Google Auth, and Wasp configures it for me. Check out the main.wasp file for more.

Also, Chakra-ui is great for building nice looking UI’s really quickly and easily. Some people are turned off by the fact that they’re React components, but I find that they’re easy to customize and configure, and get me started on designs 10x faster and with less code than tailwind.

For more info on the prompts and configuration I used for the OpenAI API, check out the src/server/actions.ts file.

Stripe makes the payment functionality super easy. I configure two subscription products, one for GPT-3.5 turbo and another for GPT-4. After the user pays, I update their hasPaid and datePaid fields in the database.

Lightning / Bolt11 is a great library for working with Bitcoin Lightning payments. I used it to generate a Lightning invoice for the user to pay. After the user pays, I update their LnPayment.status field in the database (see src/server/ln.ts), which allows the user to perform a generation on the front-end. I personally accept the payments to my Alby lightning address.

I also implemented a cron job to send an email to the user to notify them 2 weeks before their subscription ends. I used SendGrid for the email service.

If you have any other questions, feel free to reach out to me on twitter