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If I have a content-type, how can I get its default file extension?

For example, given one of these content-types, I should get the following file extensions:

+------------------------+----------------+ | Content-Type | File Extension | +------------------------+----------------+ | text/plain | .txt | | application/javascript | .js | | application/gzip | .gz | +------------------------+----------------+

If there is no way to get these extensions automatically in JavaScript, my next solution would be to create a simple relationship between content-type and file extension in a JavaScript array. Therefore, I would accept an answer which has a simple table/database of the most common content-type and file extensions.

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5 Answers 5

Reset to default
49

For Node applications, there is a more up-to-date answer now, which is to use the mime-types NPM package, e.g.:

var mime = require('mime-types'), fileExtension = mime.extension('text/plain');
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2 Comments

the mime npm package is an alternative and does the same but returns multiple possible extensions (as appropriate) - looks slightly more popular
or mime-db is good
19

from nginx

types { text/html html htm shtml; text/css css; text/xml xml; image/gif gif; image/jpeg jpeg jpg; application/x-javascript js; application/atom+xml atom; application/rss+xml rss; text/mathml mml; text/plain txt; text/vnd.sun.j2me.app-descriptor jad; text/vnd.wap.wml wml; text/x-component htc; image/png png; image/tiff tif tiff; image/vnd.wap.wbmp wbmp; image/x-icon ico; image/x-jng jng; image/x-ms-bmp bmp; image/svg+xml svg; image/webp webp; application/java-archive jar war ear; application/mac-binhex40 hqx; application/msword doc; application/pdf pdf; application/postscript ps eps ai; application/rtf rtf; application/vnd.ms-excel xls; application/vnd.ms-powerpoint ppt; application/vnd.wap.wmlc wmlc; application/vnd.google-earth.kml+xml kml; application/vnd.google-earth.kmz kmz; application/x-7z-compressed 7z; application/x-cocoa cco; application/x-java-archive-diff jardiff; application/x-java-jnlp-file jnlp; application/x-makeself run; application/x-perl pl pm; application/x-pilot prc pdb; application/x-rar-compressed rar; application/x-redhat-package-manager rpm; application/x-sea sea; application/x-shockwave-flash swf; application/x-stuffit sit; application/x-tcl tcl tk; application/x-x509-ca-cert der pem crt; application/x-xpinstall xpi; application/xhtml+xml xhtml; application/zip zip; application/octet-stream bin exe dll; application/octet-stream deb; application/octet-stream dmg; application/octet-stream eot; application/octet-stream iso img; application/octet-stream msi msp msm; audio/midi mid midi kar; audio/mpeg mp3; audio/ogg ogg; audio/x-realaudio ra; video/3gpp 3gpp 3gp; video/mpeg mpeg mpg; video/quicktime mov; video/x-flv flv; video/x-mng mng; video/x-ms-asf asx asf; video/x-ms-wmv wmv; video/x-msvideo avi; video/mp4 m4v mp4; }
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While the answer shows which extensions match different mime-types, it doesn't explain how to fetch this info through JavaScript. Consider adding your working?
13

There is a best package is

mime-db lib npm 

var mimeDb = require("mime-db")

usage(it return object)

var data = mimeDb['image/x-icon'] console.log(data)

To get extenstions

 console.log(data.extensions[0])

another one is mime-types derived from mime-db

mime types

but while i use mime types little bugy in getting extension image/x-icon

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8 
export const FileMimeType = { 'audio/x-mpeg': 'mpega', 'application/postscript': 'ps', 'audio/x-aiff': 'aiff', 'application/x-aim': 'aim', 'image/x-jg': 'art', 'video/x-ms-asf': 'asx', 'audio/basic': 'ulw', 'video/x-msvideo': 'avi', 'video/x-rad-screenplay': 'avx', 'application/x-bcpio': 'bcpio', 'application/octet-stream': 'exe', 'image/bmp': 'dib', 'text/html': 'html', 'application/x-cdf': 'cdf', 'application/pkix-cert': 'cer', 'application/java': 'class', 'application/x-cpio': 'cpio', 'application/x-csh': 'csh', 'text/css': 'css', 'application/msword': 'doc', 'application/xml-dtd': 'dtd', 'video/x-dv': 'dv', 'application/x-dvi': 'dvi', 'application/vnd.ms-fontobject': 'eot', 'text/x-setext': 'etx', 'image/gif': 'gif', 'application/x-gtar': 'gtar', 'application/x-gzip': 'gz', 'application/x-hdf': 'hdf', 'application/mac-binhex40': 'hqx', 'text/x-component': 'htc', 'image/ief': 'ief', 'text/vnd.sun.j2me.app-descriptor': 'jad', 'application/java-archive': 'jar', 'text/x-java-source': 'java', 'application/x-java-jnlp-file': 'jnlp', 'image/jpeg': 'jpg', 'application/javascript': 'js', 'text/plain': 'txt', 'application/json': 'json', 'audio/midi': 'midi', 'application/x-latex': 'latex', 'audio/x-mpegurl': 'm3u', 'image/x-macpaint': 'pnt', 'text/troff': 'tr', 'application/mathml+xml': 'mathml', 'application/x-mif': 'mif', 'video/quicktime': 'qt', 'video/x-sgi-movie': 'movie', 'audio/mpeg': 'mpa', 'video/mp4': 'mp4', 'video/mpeg': 'mpg', 'video/mpeg2': 'mpv2', 'application/x-wais-source': 'src', 'application/x-netcdf': 'nc', 'application/oda': 'oda', 'application/vnd.oasis.opendocument.database': 'odb', 'application/vnd.oasis.opendocument.chart': 'odc', 'application/vnd.oasis.opendocument.formula': 'odf', 'application/vnd.oasis.opendocument.graphics': 'odg', 'application/vnd.oasis.opendocument.image': 'odi', 'application/vnd.oasis.opendocument.text-master': 'odm', 'application/vnd.oasis.opendocument.presentation': 'odp', 'application/vnd.oasis.opendocument.spreadsheet': 'ods', 'application/vnd.oasis.opendocument.text': 'odt', 'application/vnd.oasis.opendocument.graphics-template': 'otg', 'application/vnd.oasis.opendocument.text-web': 'oth', 'application/vnd.oasis.opendocument.presentation-template': 'otp', 'application/vnd.oasis.opendocument.spreadsheet-template': 'ots', 'application/vnd.oasis.opendocument.text-template': 'ott', 'application/ogg': 'ogx', 'video/ogg': 'ogv', 'audio/ogg': 'spx', 'application/x-font-opentype': 'otf', 'audio/flac': 'flac', 'application/annodex': 'anx', 'audio/annodex': 'axa', 'video/annodex': 'axv', 'application/xspf+xml': 'xspf', 'image/x-portable-bitmap': 'pbm', 'image/pict': 'pict', 'application/pdf': 'pdf', 'image/x-portable-graymap': 'pgm', 'audio/x-scpls': 'pls', 'image/png': 'png', 'image/x-portable-anymap': 'pnm', 'image/x-portable-pixmap': 'ppm', 'application/vnd.ms-powerpoint': 'pps', 'image/vnd.adobe.photoshop': 'psd', 'image/x-quicktime': 'qtif', 'image/x-cmu-raster': 'ras', 'application/rdf+xml': 'rdf', 'image/x-rgb': 'rgb', 'application/vnd.rn-realmedia': 'rm', 'application/rtf': 'rtf', 'text/richtext': 'rtx', 'application/font-sfnt': 'sfnt', 'application/x-sh': 'sh', 'application/x-shar': 'shar', 'application/x-stuffit': 'sit', 'application/x-sv4cpio': 'sv4cpio', 'application/x-sv4crc': 'sv4crc', 'image/svg+xml': 'svgz', 'application/x-shockwave-flash': 'swf', 'application/x-tar': 'tar', 'application/x-tcl': 'tcl', 'application/x-tex': 'tex', 'application/x-texinfo': 'texinfo', 'image/tiff': 'tiff', 'text/tab-separated-values': 'tsv', 'application/x-font-ttf': 'ttf', 'application/x-ustar': 'ustar', 'application/voicexml+xml': 'vxml', 'image/x-xbitmap': 'xbm', 'application/xhtml+xml': 'xhtml', 'application/vnd.ms-excel': 'xls', 'application/xml': 'xsl', 'image/x-xpixmap': 'xpm', 'application/xslt+xml': 'xslt', 'application/vnd.mozilla.xul+xml': 'xul', 'image/x-xwindowdump': 'xwd', 'application/vnd.visio': 'vsd', 'audio/x-wav': 'wav', 'image/vnd.wap.wbmp': 'wbmp', 'text/vnd.wap.wml': 'wml', 'application/vnd.wap.wmlc': 'wmlc', 'text/vnd.wap.wmlsc': 'wmls', 'application/vnd.wap.wmlscriptc': 'wmlscriptc', 'video/x-ms-wmv': 'wmv', 'application/font-woff': 'woff', 'application/font-woff2': 'woff2', 'model/vrml': 'wrl', 'application/wspolicy+xml': 'wspolicy', 'application/x-compress': 'z', 'application/zip': 'zip' };

to use this provide mime type to object

console.log(FileMimeType[image/jpeg])
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that should be console.log(FileMimeType["image/jpeg"])
0

If you want to roll your own MIME -> extension mapping (rather than using a package), this list would be a good start: https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types

The full list of all official MIME types (linked from the article above) can be found here: https://www.iana.org/assignments/media-types/media-types.xhtml

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