File upload functionality is essential for modern React applications, from profile pictures to document management systems. As the creator of CoreUI with over 11 years of React development experience since 2014, I’ve implemented file uploads in countless enterprise applications. The most effective solution is to use a file input with onChange handler, store the file in state, and send it using FormData. This approach works seamlessly with any backend API and provides full control over the upload process.

Uploading files in JavaScript enables users to submit documents, images, and other files to your server without page refreshes. As the creator of CoreUI with over 25 years of JavaScript development experience, I’ve implemented file uploads in countless production applications for user profiles and document management. The most reliable approach uses FormData with the fetch API to handle file uploads with proper content types. This method provides secure file transfer while maintaining full control over the upload process and error handling.