Step-by-step guides for the most common Cursor problems, written by real developers.
After Cursor refactored your API endpoint code, TypeScript errors report type mismatches between client requests and server responses. The endpoint signatures don't match what the client is sending.
Type definitions or interfaces were likely modified incorrectly during refactoring.
An API endpoint that was working correctly now returns 404 Not Found errors after Cursor refactored your route definitions. The route is no longer accessible even though the handler exists.
Route registration or path may have been broken during the refactoring.
After Cursor moved or reorganized your source files, many import statements are broken. The build fails because modules can't be found or import paths are incorrect.
Relative paths didn't get updated when files moved.
API requests generated by Cursor are missing required headers, causing requests to fail with 400 or 401 errors. The server requires specific headers like Authorization or Content-Type, but they're no longer being sent.
Header setup code may have been removed or restructured incorrectly.
After Cursor refactored your GraphQL queries, queries are rejected with syntax errors or field not found errors. GraphQL queries that were working no longer execute.
Query syntax or schema expectations were changed incorrectly.
After Cursor refactored your Stripe webhook handler, webhook events are no longer being received or processed. Payments fail to process because webhook callbacks don't fire.
The webhook endpoint URL or handler logic was broken.
After enabling or upgrading TypeScript strict mode, Cursor's refactored code now has many type errors. The strict rules catch null/undefined issues and type mismatches that were previously ignored.
Code needs proper typing to satisfy strict mode requirements.
After Cursor refactored your API server, requests from the frontend are blocked by CORS errors. The browser blocks responses due to missing Access-Control headers.
CORS middleware was removed or misconfigured.
After Cursor refactored your async/await code, promises are no longer resolving correctly. Operations that should happen sequentially are executing out of order, causing data inconsistencies.
Async/await syntax or promise handling was likely changed incorrectly.
After Cursor refactored your API response handling code, parsing responses fails with errors. The application expects one format but the API is returning another.
Response handling or format expectation was likely changed incorrectly.
After Cursor refactored your Supabase authentication integration, login/signup stops working. Users cannot authenticate or their session isn't being maintained.
Supabase client initialization or auth flow was broken.
After Cursor refactored your security middleware, CSRF tokens are no longer being validated. Form submissions succeed even with invalid tokens, creating a serious security vulnerability.
The CSRF middleware was either removed or incorrectly configured during code reorganization.
JWT tokens generated before Cursor's refactoring are now rejected with signature verification errors. The application validates incoming JWTs but now fails on all tokens, including valid ones.
This typically occurs when the JWT secret key configuration changes or the verification algorithm is modified during code generation.
After using Cursor's AI to refactor authentication code, OAuth token refresh requests return 401 Unauthorized errors. The application was previously handling token refresh correctly, but the AI-generated changes broke the flow.
Users are unexpectedly logged out during their sessions, and the app fails to silently refresh expired tokens before making API requests.
After Cursor reorganized middleware in your Express app, authentication checks run after route handlers, causing protected routes to execute without validation. Requests that should be blocked are passing through.
The middleware chain was reordered during code cleanup, and now auth middleware runs too late or not at all for certain routes.
User sessions are no longer persisting to Redis after Cursor reorganized your session middleware code. Users are logged out on page refresh, defeating the purpose of persistent sessions.
The Redis client may be misconfigured or the session store initialization was altered during the refactoring.
After Cursor refactored multiple authentication-related files, the entire login/logout flow is broken. Users cannot log in or stay logged in, and the app behaves inconsistently across pages.
Multiple components of the auth system may be broken.
Database queries generated by Cursor's AI are throwing syntax errors when executed. The ORM (Sequelize, TypeORM, Prisma) rejects the generated queries as invalid, causing runtime failures.
The AI likely misunderstood the ORM's query API or used outdated syntax.
After Cursor generated new database migration files, attempting to roll back to a previous version fails with syntax errors or constraint violations. The database is left in an inconsistent state.
The down migration (rollback) may be malformed or incompatible with the current schema.
After Cursor reorganized your database connection code, the application runs out of available connections under load. Requests start failing with timeout or pool exhaustion errors.
Connections are not being properly closed or released back to the pool, causing a leak.
After Cursor refactored your ORM queries, page load times increased dramatically. Database logs show hundreds of queries for operations that previously took just a few.
The AI-generated code is fetching related entities one-by-one instead of in batch, causing the classic N+1 problem.
After Cursor edited your Prisma schema, running migrations fails with errors. The schema changes can't be applied to the database.
The schema syntax may be invalid or incompatible with current data.
After Cursor refactored your database transaction code, operations that should succeed or fail together are now failing partially. Data consistency is compromised.
Transaction wrapping or commit/rollback logic was broken.
Your GitHub Actions workflow stopped running successfully after Cursor made changes to the workflow YAML file. Build or deployment steps are now failing, blocking merges.
The YAML syntax or workflow logic was likely corrupted during refactoring.
The npm run build or similar build command now fails after Cursor reorganized your project files. The build pipeline is looking for files in the wrong locations or calling missing scripts.
Build artifacts are not being generated, preventing deployment.
After Cursor refactored your Next.js application, the build command fails. The application won't build for production.
The refactored code violates Next.js requirements or broke the build configuration.
After Cursor refactored your webpack configuration, the build process fails with syntax errors or configuration errors. The webpack config is malformed.
The configuration syntax or structure was changed incorrectly.
After Cursor modified your webpack or dev server configuration, hot module reload (HMR) no longer works. Changes require full page refresh to see updates, slowing down development.
HMR configuration or webpack middleware was broken.
Docker build fails with errors after Cursor modified your application code. The build process was working before the refactoring, but now fails at various stages.
The Dockerfile or build artifacts may have been inadvertently modified, or dependencies changed.
Environment variables are not being loaded correctly in production after Cursor reorganized your configuration management code. The application uses hardcoded values or incorrect env var names.
What worked in development now fails in deployed environments.
After Cursor refactored your React component code, components are re-rendering far too frequently, causing performance degradation and jank on the page.
Components that shouldn't re-render are being triggered by parent updates.
Your application has developed a memory leak after Cursor refactored cleanup code. Memory usage increases over time and never decreases, eventually causing crashes or slowdowns.
Event listeners or subscriptions are not being properly cleaned up.
After Cursor refactored your database query code, certain queries have become significantly slower. Page loads that were previously fast now timeout or feel laggy.
The generated queries are inefficient or missing important indexes.
After Cursor refactored your API request code, the application suddenly exceeds rate limits and receives 429 Too Many Requests errors. API calls that were working are now being rate limited.
The refactored code may be making redundant requests or not implementing proper batching.
After Cursor refactored your component code, the application hangs or becomes unresponsive. useEffect or state updates are causing infinite loops that never terminate.
A circular dependency or missing condition is causing the loop.
After Cursor refactored your server response headers, caching is not working correctly. Either assets are cached too long (users see stale content) or not cached at all (every request hits server).
Cache-Control headers were changed incorrectly.
Your application's bundle size has significantly increased after Cursor refactored the code. Load times are now slow, especially on slower networks and mobile devices.
The refactored code may be importing unused dependencies or breaking code splitting.
Images that were previously displaying correctly now fail to load after Cursor reorganized your asset or component files. Broken image icons appear where images should be.
Image paths are incorrect after the file move.
After Cursor refactored your component code, event listeners are being attached multiple times. Clicking a button fires the handler multiple times, or scroll events fire excessively.
The useEffect cleanup or listener removal logic was broken.
After Cursor refactored your state management code (Redux, Context, or other), state changes are no longer reflected in the UI. Components aren't updating when state changes.
The state management integration or store configuration may have been broken.
After Cursor reorganized your internationalization (i18n) files, translations are no longer working. Pages display key names instead of translated text, or missing locale files cause errors.
i18n configuration or translation file paths were broken during refactoring.
After Cursor refactored your modal components, modals open but never close. Users are stuck seeing the modal overlay and cannot interact with the page beneath.
Modal state management or close handler was likely broken.
Your application's mobile responsive design stopped working correctly after Cursor refactored the layout components. Mobile views are broken, showing desktop layout at small screen sizes.
Media queries or viewport configuration may have been removed.
After Cursor refactored your form code, client-side validation was removed. Forms now accept invalid input and submit it to the server, wasting resources and potentially causing errors.
Validation functions or checks were deleted during the refactoring.
After Cursor cleaned up React components, error boundaries were removed. When a component throws an error, the entire application crashes instead of showing a graceful error message.
Error handling is now missing from critical parts of the app.
A React component that was previously rendering correctly now fails to display or shows blank/error states after Cursor refactored the component code.
The component may have missing state, incorrect hooks, or broken rendering logic.
CSS styles that were previously applied are no longer working after Cursor reorganized your style files or component structure. Elements appear unstyled despite style rules existing in your CSS files.
The stylesheet is likely not being imported or referenced correctly.
Buttons that were previously clickable no longer trigger their onClick handlers after Cursor refactored the component code. Users click buttons but nothing happens.
Event handler binding or attachment may have been broken.
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