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How can I create and throw a custom error in JavaScript within a try/catch block for better error handling?

Asked on Nov 26, 2025

Answer

To create and throw a custom error in JavaScript, you can define a new error class that extends the built-in Error class. This allows you to provide a custom message and additional properties if needed. Here's an example of how to do this within a try/catch block.

<!-- BEGIN COPY / PASTE -->
        class CustomError extends Error {
            constructor(message) {
                super(message);
                this.name = "CustomError";
            }
        }

        try {
            throw new CustomError("This is a custom error message");
        } catch (error) {
            console.error(`${error.name}: ${error.message}`);
        }
        <!-- END COPY / PASTE -->

Additional Comment:

The "CustomError" class extends the built-in "Error" class, allowing you to create errors with a custom name and message.
In the "try" block, a new "CustomError" is thrown with a specific message.
The "catch" block captures the error and logs its name and message to the console.
This approach enhances error handling by allowing you to differentiate between different types of errors.

✅ Answered with JavaScript best practices.

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How can I create and throw a custom error in JavaScript within a try/catch block for better error handling?

Asked on Nov 26, 2025

Answer

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