ChatGPT with MERN Stack Build SAAS Project with Stripe

Build an ai content generator SaaS using the mern stack with ChatGPT and Stripe subscription. Learn registration, a three-day trial, credits, and tiered pricing.

Configure a decoupled express backend for a MERN project by initializing npm, installing express, dotenv, jwt, mongoose, bcryptjs, and nodemon, and creating a server.js with an mvc structure.

Model the user, content history, and payment history using mongoose schemas to define blueprints, enable references to payments and histories, and support subscriptions and api logs.

Learn to implement a user registration controller in a MERN SAAS app: validate input, hash passwords with bcrypt, create a user with username, email, 3-day trial, and save to MongoDB.

Connect your app to MongoDB with a connect db function using mongoose, handle errors and export the module, and enable express.json to parse incoming JSON payloads during user registration.

Build robust error handling in an Express app by creating a four-argument error middleware, standardizing responses with status and message, and using dotenv and express-async-handler to manage async errors.

Implement login logic that validates email and password with bcrypt, generates a JWT token, stores it in an httpOnly cookie, and returns user details on success.

Generate a JWT on login and store it in an httpOnly cookie for cookie-based authentication. Expire the token and enforce sameSite for secure endpoint authorization and logout.

Implement logout functionality by clearing the auth cookie and returning a 200 json success response, switch to a lockout endpoint, and verify token removal via Postman.

Implement is authenticated middleware to verify a JWT from cookies before accessing protected resources, then attach the user to the request and protect routes like the user profile.

Learn how to obtain and secure an OpenAI API key. Store it in an environment file and call OpenAI models like GPT four turbo for text generation in MERN.

Develop an OpenAI controller in a MERN stack app to generate content via chat completion, manage prompts and authentication, persist history, and enforce user credit checks.

Implement the three day trial by setting a trial expires date at registration, granting 100 credits, and incrementing API requests, with a cron-based expiry check and paid plan gating.

Implement an api request limit middleware to track user api calls, verify login via req.user, and enforce monthly plan limits, returning api request limit reached when exceeded.

Integrate Stripe payment for subscriptions using the Stripe Node.js library, create a payment intent with client secret, and secure the flow on client and backend in test mode.

Create a free subscription flow with a dedicated controller that interfaces with Stripe, calculates the next billing date, checks renewal, saves payment, updates the user, and returns a success response.

Master how to verify Stripe payments using the verification endpoint (versus webhook), retrieve a payment id, and update the user's subscription plan based on the payment result.

use node-cron to schedule daily trial expiry checks and monthly billing. update users via update many, toggle tri active, and populate payment and history for free, basic, and premium plans.

Create a check auth controller in a MERN stack project to verify user tokens with jwt.verify from cookies, exposing /auth/check and returning isAuthenticated true or false for client-side access.