1. Authentication and Session Management Issues

Understanding the Issue

Users may experience authentication failures, session timeouts, or issues persisting authentication state.

Root Causes

• Incorrect Blitz.js authentication configuration.
• Session cookie misconfiguration or missing encryption keys.
• Issues with CSRF tokens in server-side requests.

Fix

Ensure Blitz.js authentication is properly configured:

blitz generate auth

Check that session middleware is included in blitz.config.js:

import { sessionMiddleware } from "blitz";

module.exports = {
  middleware: [
    sessionMiddleware({ isAuthorized: (user) => !!user })
  ]
};

Regenerate session keys if authentication fails:

blitz prisma migrate reset

2. Prisma Database Connection Errors

Understanding the Issue

Database queries in Blitz.js may fail due to Prisma integration problems.

Root Causes

• Incorrect database URL in the .env file.
• Pending or failed Prisma migrations.
• Prisma client not initialized properly.

Fix

Verify database connection settings in .env:

DATABASE_URL="postgresql://user:password@localhost:5432/mydb"

Apply pending Prisma migrations:

blitz prisma migrate deploy

Ensure Prisma client is properly generated:

blitz prisma generate

3. Routing and API Endpoint Conflicts

Understanding the Issue

Navigation or API requests may result in 404 errors or unexpected behavior.

Root Causes

• Conflicts between Next.js pages and Blitz.js API routes.
• Incorrect usage of dynamic routes.
• Improper import paths for Blitz queries and mutations.

Fix

Ensure query and mutation imports are correct:

import getUser from "app/users/queries/getUser";

Use Blitz’s API functions instead of raw Next.js API routes:

const user = await invoke(getUser, { id: 1 });

Verify route structure and avoid overlapping API paths:

Ensure that API route names do not conflict with page routes.

4. Deployment and Environment Configuration Issues

Understanding the Issue

Blitz.js applications may fail to deploy or behave differently in production.

Root Causes

• Missing environment variables during deployment.
• Incorrect next.config.js or blitz.config.js settings.
• Database migrations not applied in production.

Fix

Ensure all required environment variables are set:

vercel env pull

Apply Prisma migrations before starting the production server:

blitz prisma migrate deploy

Check that blitz.config.js is configured correctly:

module.exports = {
  cli: {
    clearConsoleOnBlitzDev: false
  }
};

5. Performance Optimization and Debugging

Understanding the Issue

Blitz.js applications may experience slow performance or high memory usage.

Root Causes

• Excessive client-side rendering instead of server-side rendering.
• Large database queries not optimized with pagination.
• Unnecessary re-renders due to state mismanagement.

Fix

Optimize queries with pagination and filtering:

const users = await db.user.findMany({ skip: 0, take: 10 });

Use server-side rendering where applicable:

export const getServerSideProps = async () => { return { props: { data } }; };

Debug performance bottlenecks using Blitz’s debugging tools:

blitz dev --debug

Conclusion

Blitz.js provides a robust full-stack framework for React applications, but troubleshooting authentication failures, database connectivity, routing conflicts, deployment issues, and performance bottlenecks is crucial for smooth development. By optimizing database queries, refining API routes, and properly managing environment configurations, developers can maximize Blitz.js efficiency.

FAQs

1. Why is authentication failing in Blitz.js?

Ensure the session middleware is included in blitz.config.js and regenerate session keys if needed.

2. How do I fix Prisma connection issues in Blitz.js?

Verify the .env database URL, apply pending migrations, and regenerate the Prisma client.

3. Why are some Blitz.js routes not working?

Check for conflicts between API and page routes, and ensure queries and mutations are correctly imported.

4. How do I deploy a Blitz.js application?

Set up environment variables, apply database migrations, and verify production configurations in blitz.config.js.

5. How can I optimize performance in Blitz.js?

Use server-side rendering where necessary, optimize database queries with pagination, and minimize unnecessary re-renders.