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Express

Node.js Express Error Handling

Express Error Handling

Node.js Express error handling uses middleware for 404 and 500 errors.

Introduction to Error Handling in Express

Error handling in Node.js Express is a crucial aspect of developing robust web applications. Express uses middleware functions to manage errors, allowing developers to handle HTTP errors such as 404 (Not Found) and 500 (Internal Server Error) efficiently. This guide will walk you through the basics of setting up error handling in your Express application.

Handling 404 Errors

A 404 error occurs when a requested resource cannot be found. In Express, you can handle 404 errors by adding a middleware function after all your route handlers. This middleware function will catch any requests that weren't matched by previous routes.

Handling 500 Errors

A 500 error indicates a server error. You can handle these errors using a dedicated error-handling middleware function. This function must include four arguments: err, req, res, and next. This middleware will catch any errors passed to the next() function.

Custom Error Handling

Express allows you to create custom error handling logic by defining your own error-handling middleware functions. This can be especially useful for logging errors or displaying custom error pages. You can define multiple error-handling middleware to address different types of errors.

Conclusion

Effective error handling is vital for building resilient Express applications. By utilizing middleware for 404 and 500 errors, you can ensure that your application handles unexpected situations gracefully. Remember to tailor your error-handling logic to fit the specific needs of your application for the best results.

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