A compiled list and resources to figure out content-type, and extensions for files. Each list is JSON format and comes with multiple variations. Feel free to transpile the list if it doesn't fit your needs.
There are 4 different json files located in the /bin/ folder.
mime-extensions.json- Array of objects each containing a MIME string and the corresponding extensions associated with it. The extensions property is an array as there could be multiple extensions; ie: image/jpeg could be jpg, jpeg, or even jpemime2ext.json- Dictionary object containing the mime as a key and a single extension as the value. NOTE: The value is automatically pulled during conversion so it may not be the most popular extensionext2mime.json- Dictionary object containing the extension as the key, and the common MIME type as the valuecomplete.json- Array of objects each containing a mime type, extensions, and byte-sginatures. The byte-signatures are the known "magic numbers" found in the file's header.
The files directly in /bin/ are pretty-formatted JSON files, the original condensed versions are located in /converter/output/
The files mime2ext.json and ext2mime.json are pretty self-explanitory, the complicated one is complete.json. The novice JSON/JavaScript user should be able to figure it out instantly but in case not, heres the layout:
{
"mime": "image/jpeg",
"extension": ["jpe", "jpeg", "jpg"],
"signature": [255, 216, 255]
}
- mime - Always a string, every object has at least the mime-type. It is one of the requirements when converting
- extension - Either a string, or an array of strings, there's no order to extensions (the converter assembles this arbitrarily) so the most "popular" may not be first.
- signature - Always an array, but may be an array-of-arrays. The signatures represent the "magic numbers" found in a file's header. The values of the signature are base-10 and NOT hex. In the case of array-of-arrays value it's because multiple signatures could match that type.
- Small JavaScript library to make sense of the lists. Should be useful for anyone having to deal with uploads/downloads and cloud systems.
- Considering a Java library for server-side parsing
Information used to generate these files was gatherered from