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Technologies1
Trace middleware and handle failures across the request lifecycle.
Lessons2
Error handling turns application failures into predictable responses and useful internal logs. Express uses error middleware with four arguments to handle errors passed into its request pipeline. Synchronous throws are handled by Express, while promise forwarding differs between Express 4 and 5.
Express handles requests through a sequence of registered middleware and route handlers. Middleware can inspect or change the request, stop it with a response, or pass it onward. The order of registration matters because later handlers see the result of earlier ones.
Interview questions2
Error handling turns application failures into predictable responses and useful internal logs. Express uses error middleware with four arguments to handle errors passed into its request pipeline. Synchronous throws are handled by Express, while promise forwarding differs between Express 4 and 5.
Express handles requests through a sequence of registered middleware and route handlers. Middleware can inspect or change the request, stop it with a response, or pass it onward. The order of registration matters because later handlers see the result of earlier ones.
Modules1
Express learning module