How do you handle errors in a Node.js application?

Error handling is a crucial aspect of building robust and reliable Node.js applications. In this tutorial, we’ll explore the various strategies and best practices for handling errors in a Node.js application, with code examples.

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Types of Errors

Before we dive into error handling techniques, it’s essential to understand the different types of errors that can occur in a Node.js application. Here are the most common types:

1. Syntax errors: These errors occur when you have a typo or a syntax mistake in your code.
2. Runtime errors: These errors occur when your code is executing, and something goes wrong, such as a division by zero or a null pointer exception.
3. Logical errors: These errors occur when your code runs without any errors, but the output is not what you expected. Logical errors can be hard to find and debug, and they often require a thorough understanding of your codebase.

Error Handling Techniques

Now that we’ve covered the different types of errors let’s look at some of the techniques for handling errors in a Node.js application.

1. Try-Catch Blocks