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

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

text/x-cddl is a MIME type for files written in the Concise Data Definition Language. It marks plain text files that describe data structures in a clear, human-readable way.

Its main use is to define schemas and validation rules for custom data formats. Developers use it to help tools understand how data is structured, ensuring that configurations and protocols follow the expected format.

• Defining and validating data models
• Documenting expected data formats
• Supporting software toolchains with custom data rules

The files that use this MIME type commonly have the extension CDDL. This helps systems and developers quickly identify and process these schema definitions.

For more technical details, see resources like RFC 8610.

Associated file extensions

.cddl

Usage Examples

HTTP Header

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

    Content-Type: text/x-cddl
  

HTML

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

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

Associated file extensions

.cddl