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What is Express error-handling middleware?

Junior NodeJS
Quick Answer Error-handling middleware in Express has four parameters (err, req, res, next) รขโ‚ฌโ€ Express knows it's an error handler by the arity. Define it last, after all routes. When you call next(err) anywhere, Express skips to this handler. It catches any error passed to next() and lets you format and return consistent error responses.

Answer

A special middleware with four parameters used to catch and manage errors in Express apps.
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