What is MIME type "application/x-tiddler"?

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

application/x-tiddler is a MIME type for individual content units in a TiddlyWiki system.

It signals that a file holds a tiddler – a self-contained piece of text and metadata used to build a wiki page.

These files are stored with the extension TID.

Main use: Managing and organizing modular notes in TiddlyWiki.
Functionality: Each file holds a small data block that can be updated or rearranged independently.
Practical use: It is used for personal note systems, project outlines, and dynamic content in web applications.
Technical note: The "x-" prefix marks it as a non-standard or experimental MIME type.

Learn more about TiddlyWiki.

Associated file extensions

.tid

Usage Examples

HTTP Header

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


    Content-Type: application/x-tiddler

HTML

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


    <a href="file.dat" type="application/x-tiddler">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-tiddler');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.tid

FAQs

What is the purpose of the application/x-tiddler MIME type?

This MIME type identifies individual content units, known as tiddlers, within the TiddlyWiki ecosystem. It signals that the file contains a self-contained note with metadata headers and a text body, designed to be imported or exported from a wiki.

Which file extension is associated with application/x-tiddler?

The primary file extension for this MIME type is .tid. These files are plain text and are commonly used when running TiddlyWiki on Node.js to store individual notes as separate files. See more at tid.

How do I configure my web server to serve .tid files correctly?

For Apache, add the line AddType application/x-tiddler .tid to your .htaccess file. For Nginx, include application/x-tiddler tid; within the types block of your nginx.conf or mime.types file.

Can I edit application/x-tiddler files in a text editor?

Yes, files served as application/x-tiddler are essentially plain text files formatted with metadata headers (like title: and tags:) followed by the content. You can open and edit them in tools like Notepad, Vim, or Visual Studio Code.

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

Browsers do not have native rendering support for application/x-tiddler because it is a non-standard type (indicated by the x- prefix). Consequently, most browsers default to downloading the file rather than attempting to display it as text or HTML.

What is the internal structure of a file with this MIME type?

A typical application/x-tiddler file follows a format similar to email messages (RFC 822). It starts with a block of name: value header lines defining properties like the tiddler's title and modification date, followed by a blank line and the actual text content.

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.