A JavaScript minifier is commonly used when preparing JavaScript for production, but the resulting code should always be tested before deployment. Minification tools are designed to reduce file size without changing the intended functionality, although certain code or configuration issues can sometimes cause unexpected behavior. Keep an unminified version of the source code as a backup and use source maps when appropriate for easier debugging. After minifying, test important website features and interactions to confirm that the scripts work as expected across the browsers and devices you support.