Elastic RUM (Real User Monitoring) helps developers gain insights into application performance by tracking user interactions, but diagnosing errors in minified JavaScript files can be challenging. Minification, used to improve loading times by reducing file sizes, often compresses code into a single line, making error tracking difficult. Source maps offer a solution by mapping minified code back to its original form, allowing easier debugging. Developers can generate source maps for their applications and upload them to Elastic APM, which translates minified error messages into understandable code. The article provides steps for uploading source maps using cURL or a custom application, ensuring that the service version aligns with the application configuration for effective error diagnostics. This integration enhances the visibility of application errors and improves debugging efficiency, offering a comprehensive view of performance issues.