What is MIME type "image/x-jp2-codestream"?

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

image/x-jp2-codestream is a MIME type for raw JPEG-2000 codestream data. It holds the core compressed image information without a full container.

This format delivers the raw code stream produced by the JPEG-2000 algorithm. It does not bundle extra metadata or layout details found in container formats like JP2.

High Compression Efficiency: Uses wavelet-based compression for excellent image quality at reduced file sizes.
Progressive Decoding: Enables images to load in successive passes, useful for large or detailed images.
Flexible Integration: Ideal for specialized imaging applications such as digital cinema, medical imaging, and remote sensing.

Files with this MIME type are commonly seen with extensions like J2K, JPC, and J2C.

For further details on how JPEG-2000 codestreams work, visit Wikipedia: JPEG 2000.

Associated file extensions

.j2k, .jpc, .j2c

Usage Examples

HTTP Header

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


    Content-Type: image/x-jp2-codestream

HTML

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


    <a href="file.dat" type="image/x-jp2-codestream">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', 'image/x-jp2-codestream');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.j2k, .jpc, .j2c

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.