maniyakhan/todo-stack

1# Implementation Fix: Tasks Not Displaying After Authentication2 3**Date**: 2026-02-084**Issue**: After successful signup and signin, the dashboard page loads but existing tasks are not displayed on the tasks page, even though tasks exist in the database.5 6## Root Cause Analysis7 8### Problem Identified9The backend tasks API router had incorrect route path definitions that caused a mismatch between frontend API calls and backend endpoints.10 11**Backend Route Registration** (in `backend/src/main.py:78`):12```python13app.include_router(tasks_router, prefix="/api/tasks", tags=["tasks"])14```15 16**Original Route Definitions** (in `backend/src/api/tasks.py`):17```python18@router.get("/tasks")  # Created endpoint: /api/tasks/tasks ❌19@router.post("/tasks")  # Created endpoint: /api/tasks/tasks ❌20```21 22**Frontend API Calls** (in `frontend/src/app/dashboard/tasks/page.tsx:45`):23```typescript24const data: Task[] = await ApiClient.get('/api/tasks');  // Expected: /api/tasks ❌25```26 27**Result**: Frontend called `/api/tasks` but backend only had `/api/tasks/tasks`, causing 404 errors and no tasks displayed.28 29### Secondary Issue30Environment variable name mismatch:31- Frontend code used: `process.env.NEXT_PUBLIC_API_BASE_URL`32- Environment file had: `NEXT_PUBLIC_API_URL`33 34## Changes Made35 36### 1. Fixed Backend Route Paths (`backend/src/api/tasks.py`)37 38Changed all route decorators to use `/` as the base path instead of `/tasks`:39 40```python41# Before → After42@router.post("/tasks")     → @router.post("/")43@router.get("/tasks")      → @router.get("/")44@router.get("/tasks/{id}") → @router.get("/{task_id}")45@router.put("/tasks/{id}") → @router.put("/{task_id}")46@router.delete("/tasks/{id}") → @router.delete("/{task_id}")47@router.get("/tasks/stats") → @router.get("/stats")48```49 50**Result**: With prefix `/api/tasks`, routes now correctly resolve to:51- `POST /api/tasks` - Create task52- `GET /api/tasks` - List all user tasks53- `GET /api/tasks/{task_id}` - Get specific task54- `PUT /api/tasks/{task_id}` - Update task55- `DELETE /api/tasks/{task_id}` - Delete task56- `GET /api/tasks/stats` - Get task statistics57 58### 2. Fixed Environment Variable (`frontend/.env`)59 60Added missing environment variable:61```bash62NEXT_PUBLIC_API_BASE_URL=http://localhost:800063```64 65This matches the variable name used in `frontend/src/services/api.ts:6`.66 67## Verification68 69### Backend Routes Verified70```bash71Tasks Router Routes:72  ['POST'] /73  ['GET'] /74  ['GET'] /{task_id}75  ['PUT'] /{task_id}76  ['DELETE'] /{task_id}77  ['GET'] /stats78```79 80### Expected Behavior After Fix811. ✅ User signs in successfully822. ✅ JWT token is stored in localStorage833. ✅ Frontend calls `GET /api/tasks` with Authorization header844. ✅ Backend receives request at correct endpoint855. ✅ Backend validates JWT and extracts user_id866. ✅ Backend filters tasks by authenticated user_id877. ✅ Tasks are returned to frontend888. ✅ Tasks display on the dashboard/tasks page899. ✅ CRUD operations work and update UI immediately90 91## Files Modified92 931. `backend/src/api/tasks.py` - Fixed all route paths942. `frontend/.env` - Added missing environment variable95 96## Testing Recommendations97 981. **Manual Testing**:99   - Sign up a new user100   - Create several tasks101   - Verify tasks display immediately102   - Test update, delete operations103   - Sign out and sign in again104   - Verify tasks persist and display105 1062. **API Testing**:107   ```bash108   # Test with curl (replace TOKEN with actual JWT)109   curl -H "Authorization: Bearer TOKEN" http://localhost:8000/api/tasks110   ```111 1123. **Multi-User Testing**:113   - Create tasks with User A114   - Sign in as User B115   - Verify User B cannot see User A's tasks116   - Verify proper user isolation117 118## Related Files119 120- Frontend API Client: `frontend/src/lib/api-client.ts`121- Frontend API Service: `frontend/src/services/api.ts`122- Frontend Tasks Page: `frontend/src/app/dashboard/tasks/page.tsx`123- Backend Tasks Router: `backend/src/api/tasks.py`124- Backend Main App: `backend/src/main.py`125- Backend Task Service: `backend/src/services/task_service.py`126- Backend Auth Middleware: `backend/src/middleware/auth_middleware.py`127 128## Notes129 130- This fix follows the same pattern used in the todos router (`backend/src/api/todos.py`)131- All routes maintain proper JWT authentication and user isolation132- No changes needed to frontend components - they were already correct133- Backend properly filters tasks by authenticated user_id134