FileType (identify MIME-type)
ts
function FileType(filename: string): string;Most file types can be identified regardless of the file name or extension, by simply reading the first 261 bytes (at most) of the file itself. Since there is no need to read the whole file, this process is extremely quick even for very large files, and doesn’t waste any RAM.
This function accepts the following parameters:
| Parameter | Type | Requirement | Explanation |
|---|---|---|---|
filename | string | required | must be a valid and fully qualified path to an existing file |
This function returns a string containing the MIME-Type of the file, if it is identified. Here’s a list of file types that this function can identify:
| Category | Typical extension(s) | Returned MIME-Type |
|---|---|---|
| Image | jpg, jpeg | image/jpeg |
| Image | png | image/png |
| Image | gif | image/gif |
| Image | webp | image/webp |
| Image | cr2 | image/x-canon-cr2 |
| Image | tif, tiff | image/tiff |
| Image | bmp, bmp2 | image/bmp |
| Image | heif | image/heif |
| Image | jxr | image/vnd.ms-photo |
| Image | psd | image/vnd.adobe.photoshop |
| Image | ico | image/x-icon |
| Image | dwg | image/vnd.dwg |
| Video | mp4 | video/mp4 |
| Video | m4v | video/x-m4v |
| Video | mkv | video/x-matroska |
| Video | webm | video/webm |
| Video | mov, qt | video/quicktime |
| Video | avi | video/x-msvideo |
| Video | wmv | video/x-ms-wmv |
| Video | mpg | video/mpeg |
| Video | flv | video/x-flv |
| Video | 3gp | video/3gpp |
| Audio | mid | audio/midi |
| Audio | mp3 | audio/mpeg |
| Audio | m4a | audio/m4a |
| Audio | ogg | audio/ogg |
| Audio | flac | audio/x-flac |
| Audio | wav | audio/x-wav |
| Audio | amr | audio/amr |
| Audio | aac | audio/aac |
| Archive | epub | application/epub+zip |
| Archive | zip | application/zip |
| Archive | tar | application/x-tar |
| Archive | rar | application/x-rar-compressed |
| Archive | gz | application/gzip |
| Archive | bz2 | application/x-bzip2 |
| Archive | 7z | application/x-7z-compressed |
| Archive | xz | application/x-xz |
| Archive | application/pdf | |
| Archive | exe | application/x-msdownload |
| Archive | swf | application/x-shockwave-flash |
| Archive | rtf | application/rtf |
| Archive | iso | application/x-iso9660-image |
| Archive | eot | application/octet-stream |
| Archive | ps | application/postscript |
| Archive | sqlite | application/x-sqlite3 |
| Archive | nes | application/x-nintendo-nes-rom |
| Archive | crx | application/x-google-chrome-extension |
| Archive | cab | application/vnd.ms-cab-compressed |
| Archive | deb | application/x-deb |
| Archive | ar | application/x-unix-archive |
| Archive | Z | application/x-compress |
| Archive | lz | application/x-lzip |
| Archive | rpm | application/x-rpm |
| Archive | elf | application/x-executable |
| Archive | dcm | application/dicom |
| Document | doc | application/msword |
| Document | docx | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Document | xls | application/vnd.ms-excel |
| Document | xlsx | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Document | ppt | application/vnd.ms-powerpoint |
| Document | pptx | application/vnd.openxmlformats-officedocument.presentationml.presentation |
| Font | woff | application/font-woff |
| Font | woff2 | application/font-woff |
| Font | ttf | application/font-sfnt |
| Font | otf | application/font-sfnt |
| Application | wasm | application/wasm |