Posted on Oct 10 When you want to develop a backend app using Node.js and Express as frameworks for server building, you must have a way to handle the errors that could occur during a service execution.One way to prevent unhandled errors or non-execution responses is by using the middleware functions that Express allows us to use. Here is an example of how to catch and return a server response:All errors in Node.js extend from the Error class. This allows you to create a custom error class, extend from it, and use reserved keys like 'throw' for throwing your custom errors. Now, you have to create the middleware function to use.To handle errors in your server application, you need to use the 'next' function from Express, as demonstrated below:Example response:This is just a way to handle possible server custom errors, this example were made with Typescript.Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well Confirm For further actions, you may consider blocking this person and/or reporting abuse PRANTA Dutta - Oct 6 OpenSourcee - Oct 1 Jino Antony - Oct 2 потик - Oct 1 Once suspended, myepes82 will not be able to comment or publish posts until their suspension is removed. Once unsuspended, myepes82 will be able to comment and publish posts again. Once unpublished, all posts by myepes82 will become hidden and only accessible to themselves. If myepes82 is not suspended, they can still re-publish their posts from their dashboard. Note: Once unpublished, this post will become invisible to the public and only accessible to Marlon Yepes Ceballos. They can still re-publish the post if they are not suspended. Thanks for keeping DEV Community safe. Here is what you can do to flag myepes82: myepes82 consistently posts content that violates DEV Community's code of conduct because it is harassing, offensive or spammy. Unflagging myepes82 will restore default visibility to their posts. DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey. Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2023. We're a place where coders share, stay up-to-date and grow their careers.