How Can I Save Files Created with JavaScript in the Browser Without Using a Server?

Creating and Saving Files using HTML5/JavaScript

Creating and saving files in a web browser is a common task, especially when dealing with dynamic content. While it's possible to involve the server in this process, it can be inefficient if the server's role is minimal. This question explores the possibility of using pure JavaScript to facilitate file saving in a web browser without involving the server.

The Challenge: Saving Files in JavaScript

The user has developed a script that parses Collada files (a verbose 3D model format) into a more manageable JSON format. The parsed file is stored in memory, and the user wants to provide a way for the user to download the transformed file without involving the server.

The Solution: HTML5 Blob and Download Attributes

The solution lies in the HTML5 Blob and Download attributes. The Blob object allows us to create a file-like object in memory, while the Download attribute on the tag allows us to specify the filename and initiate the download.

Here's a code snippet that demonstrates the process:

function download(filename, text) {
    var blob = new Blob([text], {type: 'text/plain'});
    var pom = document.createElement('a');
    pom.setAttribute('href', URL.createObjectURL(blob));
    pom.setAttribute('download', filename);

    if (document.createEvent) {
        var event = document.createEvent('MouseEvents');
        event.initEvent('click', true, true);
        pom.dispatchEvent(event);
    }
    else {
        pom.click();
    }
}

Usage:

To use the download function, simply call it with the desired filename and text to be saved. For example:

download('test.txt', 'Hello world!');

This will create a file named "test.txt" on the user's computer with the text "Hello world!" written to it.

Compatibility:

The download function works in modern browsers that support the Blob and Download attributes. This includes:

• Chrome
• Firefox
• Safari
• Edge
• Opera

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