Error Handling in JavaScript

JavaScript provides several ways to handle errors:

try...catch

The try...catch statement allows you to define a block of code to test for errors.

Syntax:

try {
  // code that may throw an error
} catch(err) {
  // code to handle the error
}

The try block contains code that may throw an error. If an error occurs, the catch block is executed to handle the error.

You can have multiple catch blocks to handle different types of errors:

try {
  // some code ...
} catch(e1) {
  // handle error 1
} catch(e2) {
  // handle error 2
}

You can also use a finally block which is executed regardless of whether an error occurred or not:

try {
  // some code ...
} catch(e) {
  // handle error
} finally {
  // code to run regardless
}

The throw statement allows you to throw custom errors:

throw new Error("This is an error!");

You can throw any type of object, not just Error objects.

When an error occurs, an Error object is created with:

You can access these properties in the catch block:

try {
  // some code
} catch(err) {
  console.log(err.name);
  console.log(err.message);  
}

You can also throw custom error objects with your own properties:

throw {
  code: 500,
  message: "Internal server error"
};

Hope this helps! Let me know if you have any other questions.