Build SaaS Image Generator: React, Convex & OpenAI Tutorial

// Example route structure
<Route path="/" component={HomePage} />
<Route path="/credits" component={CreditsPage} />
<Route path="/dashboard" component={DashboardPage} />
        

// Convex function with automatic user access
export const myMutation = mutation({
  handler: async (ctx, args) => {
    const identity = await ctx.auth.getUserIdentity();
    const userId = identity?.subject;
    // Now you have access to the authenticated user
  }
});
        

// Simple Polar checkout creation
const checkout = await polar.checkouts.create({
  productId: PRODUCT_ID,
  successUrl: SUCCESS_URL,
  customerEmail: userEmail,
  metadata: {
    userId: user.id,
    purchaseType: "image_pack",
    quantity: 10
  }
});
        

// OpenAI image transformation
const response = await openai.images.edit({
  model: "dall-e-2",
  image: imageFile,
  prompt: `You're a world-class professional artist specializing in 
  cartoon-style transformations. Transform this image into a 
  Simpsons-style cartoon while maintaining the person's key features...`,
  n: 1,
  size: "1024x1024"
});
        

// Schedule immediate background processing
await ctx.scheduler.runAfter(0, internal.imageGen, {
  imageId: image._id,
  userId: identity.subject
});

// Return success immediately while processing continues
return { 
  success: true, 
  status: "processing" 
};