How to store file in a browser using JavaScript

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I am working for a prototype of website(Only Browser based). There is a part where I need to upload some files.Here I am using JavaScript and HTML.

Whenever user wants to upload(Like Browse button in applications) some files then it will available for next time.I am unable to do this.

Question Can we save/store/upload a file using JavaScript/HTML in browser only(Not server )??

Thanks

HTML5: FileSystem API, Modern Webkit browsers with HTML5 support are already able to handle creation of files and folders as well as their local storage using JavaScript. To be able to save files and folders from inside the web browser to the� With web storage, web applications can store data locally within the user's browser. Before HTML5, application data had to be stored in cookies, included in every server request. Web storage is more secure, and large amounts of data can be stored locally, without affecting website performance.

Yes, it's possible via FileSystem API (currently only Chrome and Opera).

window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;

document.querySelector('input[type="file"]').onchange = function(e) {
  var files = this.files;

  window.requestFileSystem(window.TEMPORARY, 1024*1024, function(fs) {
    // Duplicate each file the user selected to the app's fs.
    for (var i = 0, file; file = files[i]; ++i) {

      // Capture current iteration's file in local scope for the getFile() callback.
      (function(f) {
        fs.root.getFile(f.name, {create: true, exclusive: true}, function(fileEntry) {
          fileEntry.createWriter(function(fileWriter) {
            fileWriter.write(f); // Note: write() can take a File or Blob object.
          }, errorHandler);
        }, errorHandler);
      })(file);

    }
  }, errorHandler);

};

Client-side storage, a simple Markdown text editor, saving files in the browser has always been a tricky business. Usually when you want to save a file generated with JavaScript,� T he FileSystem-API allows the creation of files and folders as well as their local storage using JavaScript. Files can be simple text files, but even more complex files such as images are possible. Modern Webkit browsers with HTML5 support are already able to handle the FileSystem-API. We show you how you can benefit from the new possibilities.

"Can we save/store/upload a file using JavaScript/HTML in browser only(Not server )??"

Ans. is No. If you want to retain the uploaded file then you need to store it on server.

The moment the browser tab is closed the file will get lost.

Alternative: What you can do is store the name of the file on server and whenever user request the file then ask him to upload it.

For uploading the file into memory you can refer to this link .

Live Demo

Saving generated files on the client-side | Web, However, in the latest browsers unknow or rare downloaded file extensions are blocked and a prompt appears if you really want to open that file (� setItem() Just as the name implies, this method allows you to store values in the localStorage object. It takes two parameters: a key and a value. The key can be referenced later to fetch the value attached to it. window.localStorage.setItem('name', 'Obaseki Nosa'); Where name is the key and Obaseki Nosa is the value.

How to create a file and generate a download with Javascript in the , Creating downloadable files with JavaScript in your browser only takes a you store it in a Blob, the “file-like object” that JavaScript supports. Open the JavaScript Console in Chrome. Create a new variable named book by typing the following and then pressing Return (Mac) or Enter (Windows): var book; You’ve created your container, or variable, and named it “book.” When you press Return or Enter, the JavaScript Console displays the word undefined. This is exactly what you want to happen.

Creating files in JavaScript in your browser, Run JavaScript File in FireFox Browser. In order to Run javascript file in Firefox, you have similar options as chrome method given above. So you can use FireFox console which you can open by pressing Ctrl+Shift+K Or by going under Web Developer option and choosing Web Console.

But it can use the file by having its DataURL: so if the user browses a file and opens it, JavaScript should get the "DataURL" directly from HTML instead of getting "URL". Then it turns the DataURL into a file, using the readAsDataURL function and FileReader object.

Comments
  • I don't think it's possible to write files client-side only... you can read them via HTML5's File API, but writing them would probably cause way too many security issues
  • Is next time on the same machine only?
  • yes on the same machine. Is it possible. @ Michael Durrant
  • for images which approach is best??
  • @ShyamDixit I would "recommend" File API but as it is in development and only supported by Chrome I would say Indexed DB as this allows Blob and you can request quota.
  • Please note that the statuses of each of the technologies are quite out of date, for example, the File System API is no longer being maintained.
  • @Harvey it seems like at least index DB's spec has been updated in 2018. Others indeed haven't been updated for 4+ years (or even 10 for Web SQL). So now in 2020, what are the recommended ways to store data on client side (browser)? It would be great if you can share as answer to this thread to make this post more updated.
  • "Whenever user wants to upload(Like Browse button in applications) some files then it will available for next time."
  • The files written will be stored in a sandboxed directory and are available for any time.
  • great! i was unaware of that.+1 But it's non standard way as mentioned here developer.mozilla.org/en-US/docs/Web/API/LocalFileSystem
  • You got the wrong link. FileSystem (not LocalFileSystem) is yet-to-be standardised.
  • Yes I am able to save the file name only not the whole path
  • @ShyamDixit Then ask the user to enter the path manually during first upload.