Next.js - Build SaaS App with OpenAI GPT & TypeScript

Create a new Next.js project using a prepared template, set up with the Next.js 13 app directory and MongoDB boilerplate, then install and update core packages for a SaaS app.

Initialize a Next.js SaaS project by installing key packages (next, openai, stripe), and set up a server-friendly env.local file to store environment variables.

Learn how Next.js 13 routes use the app folder to map pages such as the main page and user page, and how API routes under api are structured and accessed.

Initialize Auth0 authentication and implement a user-based protection layer for the app by configuring domain, client ID and secret, and setting the callback and allowed URLs.

Implement an api route in Next.js to handle login, create the api structure, and use a link to /api/off/login to log in with a test account.

Wrap the app in a user provider to expose login state across pages, then use a client component and user hook to show the signed-in user and guard routes.

protect routes with auth0 by wrapping pages with a required function, prompting login when users are not authenticated, and restricting access to premium content on the user page.

Build a responsive user interface with a navigation bar, collapsible sidebar, and a main view using flexbox. Implement tabbed content, skeleton ui animation, and planned data fetching for posts.

Organize the app by creating profile, posts, new, and success routes in the routes folder, with protected pages. Copy boilerplate pages, fix dev server issues, and implement the nav bar.

Build a responsive Next.js navbar with a layout wrapper, tailwind grid, and a centered home link, left and right actions, and a user avatar using next image.

Build a responsive left sidebar for desktop and top bar on mobile in a Next.js app, using a data-driven TypeScript menu with dynamic icons and active-route highlighting.

Create the main page content for a Next.js SaaS app by cleaning boilerplate, building two states based on login status, and applying a flex column center layout with desktop padding.

Build a new post page in a Next.js TypeScript SaaS app, with a responsive form for title, description, keywords, and tone, using a postPrompt state and onSubmit handling.

Build a posts page with loading skeletons, display the final posts after fetching from MongoDB, and implement a post skeleton component with tailwind pulse animations.

Create profile page as the last tab, implement a section layout with headings and credits display, and add a buy credits button triggering an add credits function to stripe checkout.

Learn how to implement global state in react using recoil js, understand atoms and use recoil state, and share data across components like profile and nav bar with minimal boilerplate.

Implement recoil in the Next.js app by creating a profile atom, wrapping the app with recoil root, and using use recoil state to share and update credits across components.

Initialize OpenAI by creating an API key on the OpenAI website, then store it in a local env variable and install the OpenAI package for testing with your account.

Learn to build a Next.js API route that generates a post with OpenAI GPT using TypeScript, including a client UI, prompts, and handling responses.

Build a dynamic UI feedback system that shows loading, error, and success states while submitting to the OpenAI API, then renders the generated article below with single or multiple paragraphs.

Discover MongoDB Atlas setup for a serverless, free tier deployment, create a database and user, configure IP access, and work with databases, collections, and documents via URI.

Learn how to create an api endpoint to post articles into a MongoDB database using a reusable connect-to-database helper, environment variables, and insertOne into a posts collection.

Fetch posts from MongoDB in Next.js app by using useEffect to call the get posts API, extend the post type with an id, and display posts with a copy-to-clipboard button.

Learn how to delete posts from MongoDB using Next.js API routes by implementing a delete post route that accepts id in the request body and uses deleteOne with an ObjectId.

Fetch and display the user’s credit score on the profile page and nav bar by querying the database and updating credits in real time.

Set up Stripe with a new account in test mode, configure secret key and webhook secret, then create a test product with its price ID and API ID.

Initialize stripe in the Next.js app, create a checkout session with credits, and redirect users to the checkout URL using environment variables, with metadata and success tracking.

Implement a Stripe webhook to credit users only after payment confirmation. Use metadata to link to user IDs and update MongoDB credits in the api/webhook endpoint.

Publish your code base to a GitHub repository by connecting your GitHub account to Visual Studio Code, then stage, commit, push, and publish the branch for deployment to Vercel.

Deploy your Next.js SaaS app to Vercel by connecting GitHub, configuring environment variables, and using the public URL and base URL after deployment, with Stripe webhook and OpenAI.