blob-polyfill is a JavaScript library that provides a polyfill for the Blob API, enabling developers to work with binary data in environments that do not support the Blob functionality natively. This is particularly useful for ensuring compatibility across different browsers, especially older ones that may lack support for modern web APIs. By using blob-polyfill, developers can create and manipulate Blob objects seamlessly, enhancing the ability to handle file uploads, downloads, and other binary data operations.

While blob-polyfill is a great solution for adding Blob support, there are several alternatives that also cater to similar needs:

• blob-util is a utility library that provides functions for working with Blob objects. It offers features such as converting Blobs to base64 strings, creating Blobs from data URLs, and more. If you need a more comprehensive set of utilities for manipulating Blobs beyond just polyfilling, blob-util is a solid choice.
• blueimp-file-upload is a jQuery-based file upload library that supports multiple file selection, drag-and-drop uploads, and progress bars. It utilizes Blob objects for handling file uploads efficiently. If you are looking for a more feature-rich solution that includes file upload capabilities along with Blob support, blueimp-file-upload is worth considering.
• fetch-blob is a library that provides a Blob implementation for environments that do not support it natively. It is designed to work seamlessly with the Fetch API, allowing developers to create and manipulate Blob objects easily. If you are primarily focused on using the Fetch API and need Blob support, fetch-blob is a great alternative.
• file-saver is a library that enables saving files on the client-side. It uses Blob objects to create downloadable files, making it easy to trigger downloads in web applications. If your primary goal is to facilitate file downloads in your application, file-saver is an excellent choice.

To see how these packages compare, check out the comparison: Comparing blob-polyfill vs blob-util vs blueimp-file-upload vs fetch-blob vs file-saver.