Build an SEO Audit Tool with Stripe & Next.js

Setting up Next.js and Supabase

This tutorial assumes you have a basic understanding of React, Next.js, and Supabase. We’ll start with creating a new Next.js project using Create Next App: npx create-next-app my-seo-tool --ts. This sets up a TypeScript project with optimized build settings. After installation, navigate to the project directory and run npm install @supabase/supabase-js.

Next, initialize your Supabase project using the Supabase CLI: supabase login and supabase init. Make sure you have a Supabase account and project created.

Finally, configure your Next.js environment to connect to Supabase by installing the necessary package: npm install @supabase/supabase-js and setting up the connection string in your .env file. Ensure you've correctly set up your database schema – at a minimum, tables for users (authentication data) and potentially one to store audit results.

Implementing Stripe Billing

Integrating Stripe into your project allows you to manage subscriptions and collect payments. First, install the necessary packages: npm install stripe. You'll need a Stripe account with API keys configured securely.

To create a product for your subscription tiers, use the Stripe API: stripe.products.create({ name: 'Basic Audit', description: 'Initial SEO audit', type: 'recurring' }). This creates a recurring product that can be associated with different plans.

Next, you'll need to define your pricing plans in Stripe. You can do this through the Stripe Dashboard or via the API. For example: stripe.plans.create({ ... });. Remember to configure your webhook endpoints to handle successful payment events.

To handle Stripe declines, integrate with our Stripe decline code reference for detailed guidance on mapping and understanding declined charges; this is crucial for a reliable audit tool.

Building the Core SEO Audit Logic

This is where you’ll implement the logic to analyze your website’s SEO metrics. This could involve fetching data from APIs like Google Search Console, using a headless CMS to scrape content, or running internal checks against your own codebase. For demonstration purposes, we'll simulate some basic metric calculations.

// Example: Simulate checking for missing meta tags
async function analyzeSEO(url) {
  const response = await fetch(url);
  const html = await response.text();

  // Simplified example - a real implementation would be more robust!
  const hasMetaDescription = html.includes(<meta name="description" />);
  const hasOpenGraph = html.includes(<meta property="og:title" />);

  return {
    hasMetaDescription,
    hasOpenGraph,
    // Add more metrics here...
  };
}

// Example usage
async function runAudit(url) {
  const results = await analyzeSEO(url);
  console.log(results);
}
runAudit("https://www.example.com"); // Replace with a real URL

Consider using a library like `axios` or `node-fetch` for making HTTP requests efficiently. The key is to modularize your audit logic into reusable functions, potentially separated by SEO metric categories (title tags, meta descriptions, robots.txt, etc.).

Integrating User Accounts with Supabase

Implementing user authentication provides a centralized location to store user data and manage access control. Supabase Auth simplifies this process considerably. You can sign users up using email/password or integrate with social login providers like Google.

Create a new table in your Supabase database for User Authentication Data (username, passwordHash, etc.). Utilize Supabase's client libraries to handle authentication flows: supabase.auth.signUp() and supabase.auth.signIn().

Remember to securely store user passwords using a robust hashing algorithm. Store associated metadata (like subscription tier) in the same table or link it through foreign keys for data consistency.

Setting up a Free Tier & Paid Features

Offering tiered pricing is crucial for long-term sustainability. You can start with a free trial to allow users to experience the tool's core functionality. For paid tiers, you’ll need to define different subscription plans with varying levels of access and features.

Consider offering premium features such as advanced SEO reports, competitor analysis, or integrations with other tools. These can be gated behind higher-priced subscriptions.

To manage payment flows and user subscriptions effectively, leverage Stripe’s Subscription API. Our failed payment recovery guides cover best practices for handling potential issues with Stripe payments and automatically restarting subscription attempts.

Deployment & Monitoring

Deploy your Next.js application to a platform like Vercel or Netlify for ease of deployment and scalability. Configure continuous integration/continuous delivery (CI/CD) pipelines to automate the build and deployment process.

Monitor your application's performance using tools like New Relic, Datadog, or Sentry. Pay attention to metrics such as response times, error rates, and database query performance. Optimizing image sizes and leveraging browser caching can significantly improve performance.