What is MIME type "text/x-webidl"?

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

The MIME type text/x-webidl marks files that contain WebIDL definitions. These files describe interfaces for web APIs and components in plain text.

They are used to define how software components interact. They help browsers and development tools understand the structure of exposed objects. Developers use this format to document and enforce interface contracts.

Define browser API interfaces.
Document interaction points between components.
Support automated parsing and code generation.
Interface with WIT files in WebAssembly contexts.

Files using this type often have the WEBIDL extension. For more details on the language and its role, see the WebIDL specification.

Associated file extensions

.webidl, .wit

Usage Examples

HTTP Header

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


    Content-Type: text/x-webidl

HTML

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


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

Associated file extensions

.webidl, .wit

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.