Introduction to 'VM724:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0 - Javascript'

This error message is a common one that a programmer may encounter when working on a web application. It refers to a syntax error that occurs when trying to parse JSON data that contains an unexpected character.

Causes of the Error

The error message appears when JSON data is sent from the server in an unexpected format, such as an HTML page or an error message page. This can happen due to various reasons, including:

• Issues with the server-side code
• Incorrectly formatted data
• Outdated libraries or dependencies

How to Fix the Error

To fix the error, you can take the following steps:

1. Check the server-side code: Verify that the server-side code is correctly sending JSON data in the expected format.

2. Check the JSON data: Double-check that the JSON data is correctly formatted. You can use an online JSON validator to verify this.

3. Update libraries or dependencies: If the error is caused by outdated libraries or dependencies, update them to the latest version.

4. Handle errors gracefully: To ensure that the application doesn't break when encountering such errors, add error-handling code to your application.

Conclusion

The 'VM724:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0 - Javascript' error is a common one that a programmer may encounter while developing web applications. By understanding the causes and following the steps outlined above, you can successfully fix the error and prevent it from occurring in the future.