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

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

text/x-dart is a MIME type that signals a file contains Dart source code. It tells editors and servers to treat the file as plain text with Dart-specific syntax.

Main use: Identify Dart source code so that code editors and IDEs can offer proper syntax highlighting and code analysis.
Practical usage: It helps web servers serve these files as text rather than binary.
Technical note: The x- prefix indicates a non-standard type often used during development.

Files using this type include the Dart file format such as DART.

For more on Dart and its applications, visit Dart’s official site.

Associated file extensions

.dart

Usage Examples

HTTP Header

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


    Content-Type: text/x-dart

HTML

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


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

Associated file extensions

.dart

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.