NSFWJS is a lightweight, client-side JavaScript library that employs machine learning to identify potentially inappropriate or adult content in images. The library runs entirely in the user’s browser, ensuring privacy by not sending images to external servers for analysis. NSFWJS can classify images into five categories, providing probability scores for each category. This tool is designed to help developers implement content moderation features in web applications, social media platforms, or any service that handles user-generated images.