How to add a filename to a blob object in JavaScript?

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To Blob add a filename to an object, you can do so by Blob casting the object to File an object. File Objects inherit from Blob objects and provide additional properties, including name the `name` property, which allows you to set a name for the file. This method works in most modern browsers, but note that Internet Explorer does not support File constructors.

Will Blobbe converted toFile

Here are the basic steps to Blob convert File:

// Create a Blob object
let blob = new Blob(['Hello World'], { type: 'text/plain' });

// Convert Blob to File and set the file name to 'example. txt'
let file = new File([blob], 'example.txt');

// Now the file object has a name attribute, which you can use
console.log(file.name); // output "example.txt"

Precautions

  • This will Blob be converted to File simply adding the filename on the client side, without changing Blob the content or type of the original object.
  • When using File objects, ensure your code File runs in browsers that support constructors, or use a polyfill for cross-browser compatibility.
  • When FormData sending files, the server needs to be able to parse multipart/form-data the request and process the file upload.

Using the method described above, you can Blobadd a filename to the object and File send it as an object to the server. This approach provides a flexible way to handle file uploads, especially when you need to specify the filename.