Error Handling Middleware
Middleware functions can also handle errors by defining error-handling middleware using four parameters (err
, req
, res
, next
). Error-handling middleware functions are invoked when an error occurs during request processing.
// Error handling middleware
const errorHandlerMiddleware = (err, req, res, next) => {
console.error('An error occurred:', err);
res.status(500).send('Internal Server Error');
};
// Apply error handling middleware
app.use(errorHandlerMiddleware);
Explain the concept of middleware in NodeJS
Middleware in NodeJS refers to a software design pattern where functions are invoked sequentially in a pipeline to handle requests and responses in web applications. It acts as an intermediary layer between the client and the server, allowing for modularization of request processing logic and enabling cross-cutting concerns such as authentication, logging, error handling, and data transformation. Let’s delve deeper into the concept of middleware in NodeJS.
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