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

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

text/x-j is a MIME type that labels plain text files containing J language scripts. It means the file stores source code written in the J programming language.

Files with this MIME type use the IJS extension. These files are designed to be read and edited with any text editor.

Use Case: Developing and sharing J scripts that perform array computations and data manipulations.
Use Case: Executing commands with a J interpreter on your PC.
Key Fact: The format is text-based, making it easy for developers to modify and debug scripts.

This MIME type simplifies the way programs interpret the file and apply proper syntax highlighting in code editors. For more on file types, visit Filext.

Associated file extensions

.ijs

Usage Examples

HTTP Header

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


    Content-Type: text/x-j

HTML

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


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

Associated file extensions

.ijs

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.