react-native-mimetype

mimetype-js

Overview

I find keep making these file extension lookup tables for mime types. It's about time I put it in a module to save me the trouble.

This version differs from rsdoiel's version because we are not looking for the path module at all. This means that we can use this for React Native (which has Node, but doesn't have Path).

Examples

general case

    var mimetype = require('mimetype');
 
    console.log(mimetype.lookup("myfile.txt")); // Should display text/plain
    mimetype.set('.exotic', 'x-application/experimental'); // Add/update a mime type in the catalog
    console.log(mimetype.lookup("myfile.exotic")); // Should display x-application/experimental
    mimetype.del('.exotic'); // Removes the mime type from the catalog
    console.log(mimetype.lookup("myfile.exitoc")); // Should display false
    mimetype.forEach(function (ext, mime_type_string) {
        console.log(ext, mime_type_string); // Display the extension and matching mimetype in catalog
    });

Special cases

Sometimes detecting by filename extensions isn't work and you want to default to a general purposes mime-type (e.g. text/plain, application/octet-stream).

    var mimetype = require('mimetype');
 
    // This should display 0 (false)
    console.log(mimetype.lookup("filename.unknownMimeType");
    // This should display the string text/plain
    console.log(mimetype.lookup("filename.unknownMimeType", false, "text/plain");
    // This should display the string text/plain; charset=UTF-8
    console.log(mimetype.lookup("filename.unknownMimeType", "UTF-8", "text/plain");

Using mimetype.js with MongoDB Shell

While this was implemented as a NodeJS module it also works under MongoDB's shell. Instead of including with a "require" you would load the JavaScript file load-mimetype.js.

    load("./extras/load-mimetype.js");
    print("Check the mime type of test.txt:" + MimeType.lookup("test.txt"));

This would display something like-

    MongoDB shell version: 2.2.0
    connecting to: test
    > load("./extras/load-mimetype.js");
    > print("Check the mime type of test.txt: " + MimeType.lookup("test.txt"));
    Check the mime type of test.txt: text/plain
    >