debug:express
Express.js Debugging Guide
A systematic approach to debugging Express.js applications using proven techniques and tools.
Common Error Patterns
1. Cannot GET /route (404 Errors)
Symptoms: Route returns 404, middleware not matching Common Causes:
- Route not registered before catch-all handlers
- Missing leading slash in path
- Case sensitivity issues
- Router not mounted correctly
// Wrong: catch-all before specific routes
app.use('*', notFoundHandler);
app.get('/api/users', getUsers); // Never reached
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