NestJS API: from nest new to live, step by step

1. Create the project

npx @nestjs/cli new my-api
cd my-api
npm run start:dev      # http://localhost:3000

2. Listen on PORT

Open src/main.ts and change the listen line:

await app.listen(process.env.PORT ?? 3000, '127.0.0.1');

3. Push to GitHub

git add .
git commit -m "Listen on PORT"
git branch -M main
git remote add origin https://github.com/you/my-api.git
git push -u origin main

4. Launch and configure

Launch an app → Node.js → version → plan → domain → pay. Then App settings → Framework NestJS (install npm ci || npm install, build npm run build, start node dist/main.js). Add database and API settings under Environment variables with + Add variable → Save all.

5. Deploy from GitHub

Git deployments → connect the repository → Deploy now → add the webhook so every push deploys.

6. Test the API

curl https://yourdomain.com/

Go live on your domain

Point the domain's @ and www A records to the IP shown in Domains, wait for Points here, then Issue free SSL → Always use HTTPS → Save changes.

Database

Create a MariaDB/MySQL or PostgreSQL database under Databases (host localhost), or attach MongoDB Atlas under Databases → External databases, and read the connection string from process.env in your TypeORM, Prisma or Mongoose config.