What is MIME type "application/x-js-taro"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

application/x-js-taro marks a specialized file format. It indicates that the file comes from Ichitaro Document 8 software. This format bundles text, layout, images, and other document data in a proprietary way. When such a file is handled by a system, the MIME type signals that dedicated software is needed to open or convert it.
Files like JTD, $TD, and JTT use this type.

Main use: Opening and editing Ichitaro Document 8 files.
File processing: Helps operating systems and applications recognize and correctly open these documents.
Web delivery: Supports proper handling when files are downloaded or emailed.
Conversion tasks: Assists in transforming the document into more widely used formats.

For more details on MIME types and their roles, check out the MIME types on Wikipedia.

Associated file extensions

.jtd, .$td, .jtt

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/x-js-taro

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/x-js-taro">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/x-js-taro');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.jtd, .$td, .jtt

FAQs

What is the application/x-js-taro MIME type used for?

This MIME type represents documents created by Ichitaro, a popular Japanese word processing software developed by JustSystems. It specifically denotes the version 8 document format, commonly associated with files ending in .jtd or .jtt.

How do I configure Apache to serve Ichitaro files?

To ensure your web server delivers the correct headers, add the following line to your .htaccess file or httpd.conf: AddType application/x-js-taro .jtd .jtt. This helps client browsers understand that the file requires specific software to open.

Why does my browser download the file instead of displaying it?

Web browsers like Chrome, Firefox, and Edge do not have built-in rendering engines for Ichitaro documents. When they encounter the application/x-js-taro content type, they default to downloading the file so you can open it with a local application.

Which software is required to open application/x-js-taro files?

You need the Ichitaro word processor or the free Ichitaro Viewer provided by JustSystems. If you do not have this software, you may need to convert the file to a universal format like PDF or Microsoft Word.

What does the 'x-' prefix mean in this MIME type?

The x- prefix signifies that this is a non-standard or proprietary subtype (x-js-taro) that was not originally registered with the IANA. It is used specifically to identify custom formats defined by private vendors like JustSystems.

Are there security risks associated with opening these files?

As with many complex document formats, .jtd files can potentially contain macros or exploit vulnerabilities in the viewer software. Always ensure your Ichitaro software is patched and scan downloaded files from unknown sources before opening them.

How do I add support for this MIME type in Nginx?

Update your mime.types file or your server block configuration to include the mapping. Use the directive: types { application/x-js-taro jtd jtt; } to ensure Nginx serves these files with the correct MIME type.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.