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A comprehensive library for mime-type mapping


Comprehensive MIME type mapping API based on mime-db module.

Install with npm:

npm install mime
npm run test
mime [path_string]


> mime scripts/jquery.js

Get the mime type associated with a file, if no mime type is found application/octet-stream is returned. Performs a case-insensitive lookup using the extension in path (the substring after the last '/' or '.'). E.g.

var mime = require('mime');
mime.lookup('/path/to/file.txt');         // => 'text/plain' 
mime.lookup('file.txt');                  // => 'text/plain' 
mime.lookup('.TXT');                      // => 'text/plain' 
mime.lookup('htm');                       // => 'text/html' 

Sets the mime type returned when mime.lookup fails to find the extension searched for. (Default is application/octet-stream.)

Get the default extension for type

mime.extension('text/html');                 // => 'html' 
mime.extension('application/octet-stream');  // => 'bin' 

Map mime-type to charset

mime.charsets.lookup('text/plain');        // => 'UTF-8' 

(The logic for charset lookups is pretty rudimentary. Feel free to suggest improvements.)

Custom type mappings can be added on a per-project basis via the following APIs.

Add custom mime/extension mappings

    'text/x-some-format': ['x-sf', 'x-sft', 'x-sfml'],
    'application/x-my-type': ['x-mt', 'x-mtt'],
    // etc ... 
mime.lookup('x-sft');                 // => 'text/x-some-format' 

The first entry in the extensions array is returned by mime.extension(). E.g.

mime.extension('text/x-some-format'); // => 'x-sf' 

Load mappings from an Apache ".types" format file


The .types file format is simple - See the types dir for examples.