How To Give A Blob Uploaded As Formdata A File Name

Uploading files in web applications is a common task, but sometimes dealing with blobs and setting file names can be a bit tricky. In this article, I'll walk you through how to give a blob uploaded as FormData a file name. It's a useful trick that can make your file upload process more user-friendly and organized.

When you upload a file as FormData in JavaScript, the blob data might not have a file name associated with it by default. This can be an issue, especially if you want to preserve the original file name or customize it based on user input.

To give a blob uploaded as FormData a file name, you can follow these steps:

1. Create a Blob Object: First, you need to have a blob object that you want to upload. This could be a file selected by the user through an input field or generated programmatically.

2. Add a File Name: To give the blob a file name, you can create a new File object. The File constructor takes an array of Blob objects as its first parameter, followed by the desired file name and optional properties like the last modified date.

const blob = new Blob(["Your Blob Data Here"], { type: 'application/octet-stream' });
   const fileName = "example.txt";
   const file = new File([blob], fileName, { type: blob.type });

3. Upload the File: Once you have the file object with the correct file name, you can proceed to upload it using FormData as usual.

const formData = new FormData();
   formData.append("file", file);
   
   // Use fetch or XMLHttpRequest to send the FormData to your server

By following these steps, you can ensure that the blob you upload as FormData has a meaningful file name associated with it. This can improve the user experience and help you better organize the uploaded files on the server-side.

Remember that different browsers may handle file names and blob data slightly differently, so it's a good practice to test your implementation across multiple browsers to ensure consistency.

In conclusion, giving a blob uploaded as FormData a file name is a simple yet powerful technique that can enhance your file upload functionality. By creating a File object with the desired file name before uploading the blob, you can make your web application more user-friendly and organized. Happy coding!