Guess-file-type NPM

Guess File Type

Detect the file type by doing various checks. Returns the mime type.

How it Works

First it tries to use the mimetype command. See Requirements > Optional.
If mimetype is not available, it uses the file signature (magic numbers).
If the type could not be determined, it falls back to using the file extension.
It returns the mime type of the file on success, and a string 'unknown' on failure.

Changing the Behavior

You can avoid the default behavior by using the individual functions. See Usage.

Installation

In a node.js app:

npm install guess-file-type

Optional

In Ubuntu, install the mimetype command:

sudo apt install libfile-mimeinfo-perl

The module will use it if the command is available.

Its results are much more accurate than the file command in Linux.

Usage

const fileGuesser = require('guess-file-type');

Auto guess the type

Async:

try {
    let type = await fileGuesser.guess('./test/files/gif.gif');
    console.log(type); // 'image/gif' or 'unknown' on fail
} catch (err) {
    
}

Promise:

fileGuesser.guess('./test/files/gif.gif').then( (type) => {
    console.log(type); // 'image/gif' or 'unknown' on fail
}).catch((err)=>{

});

Manual Checking

You can call the individual functions separately and compose them if neccessary.

Guess using the file signature only

Async:

try {
    let type = await fileGuesser.guessByFileSignature('./test/files/png.png');
    console.log(type);  // 'image/png' or 'unknown' on fail
} catch(err){}

Promise:

fileGuesser.guessByFileSignature('./test/files/png.png').then((type)=>{
    console.log(type);  // 'image/png' or 'unknown' on fail
}).catch((err)=>{});

Guess using the file extension only

Async:

try {
    let type = await fileGuesser.guessByExtension('./test/files/png.png');
    console.log(type);  // 'image/png' or 'unknown' on fail
} catch(err){}

Promise:

fileGuesser.guessByExtension('./test/files/png.png').then((type)=>{
    console.log(type);  // 'image/png' or 'unknown' on fail
}).catch((err)=>{});

Get file extension from mime type

let ext = guessFileType.getExtensionFromMime('image/png'); // png

Development

git clone https://github.com/kosinix/guess-file-type.git
cd [/path/to/]guess-file-type
npm install

Test

Install mocha globally

npm install mocha -g

Run test

npm test

References

Supported Types

123
3dml
3ds
3g2
3gp
7z
aab
aac
aam
aas
abw
ac
acc
ace
acu
acutc
adp
aep
afm
afp
ahead
ai
aif
aifc
aiff
air
ait
ami
apk
appcache
application
apr
arc
asc
asf
asm
aso
asx
atc
atom
atomcat
atomsvc
atx
au
avi
aw
azf
azs
azw
bat
bcpio
bdf
bdm
bed
bh2
bin
blb
blorb
bmi
bmp
book
box
boz
bpk
btif
bz
bz2
c
c11amc
c11amz
c4d
c4f
c4g
c4p
c4u
cab
caf
cap
car
cat
cb7
cba
cbr
cbt
cbz
cc
cct
ccxml
cdbcmsg
cdf
cdkey
cdmia
cdmic
cdmid
cdmio
cdmiq
cdx
cdxml
cdy
cer
cfs
cgm
chat
chm
chrt
cif
cii
cil
cla
class
clkk
clkp
clkt
clkw
clkx
clp
cmc
cmdf
cml
cmp
cmx
cod
com
conf
cpio
cpp
cpt
crd
crl
crt
cryptonote
csh
csml
csp
css
cst
csv
cu
curl
cww
cxt
cxx
dae
daf
dart
dataless
davmount
dbk
dcr
dcurl
dd2
ddd
deb
def
deploy
der
dfac
dgc
dic
dir
dis
dist
distz
djv
djvu
dll
dmg
dmp
dms
dna
doc
docm
docx
dot
dotm
dotx
dp
dpg
dra
dsc
dssc
dtb
dtd
dts
dtshd
dump
dvb
dvi
dwf
dwg
dxf
dxp
dxr
ecelp4800
ecelp7470
ecelp9600
ecma
edm
edx
efif
ei6
elc
emf
eml
emma
emz
eol
eot
eps
epub
es3
esa
esf
et3
etx
eva
evy
exe
exi
ext
ez
ez2
ez3
f
f4v
f77
f90
fbs
fcdt
fcs
fdf
fe_launch
fg5
fgd
fh
fh4
fh5
fh7
fhc
fig
flac
fli
flo
flv
flw
flx
fly
fm
fnc
for
fpx
frame
fsc
fst
ftc
fti
fvt
fxp
fxpl
fzs
g2w
g3
g3w
gac
gam
gbr
gca
gdl
geo
gex
ggb
ggt
ghf
gif
gim
gml
gmx
gnumeric
gph
gpx
gqf
gqs
gram
gramps
gre
grv
grxml
gsf
gtar
gtm
gtw
gv
gxf
gxt
h
h261
h263
h264
hal
hbci
hdf
hh
hlp
hpgl
hpid
hps
hqx
htke
htm
html
hvd
hvp
hvs
i2g
icc
ice
icm
ico
ics
ief
ifb
ifm
iges
igl
igm
igs
igx
iif
imp
ims
in
ink
inkml
install
iota
ipfix
ipk
irm
irp
iso
itp
ivp
ivu
jad
jam
jar
java
jisp
jlt
jnlp
joda
jpe
jpeg
jpg
jpgm
jpgv
jpm
js
json
jsonml
kar
karbon
kfo
kia
kml
kmz
kne
knp
kon
kpr
kpt
kpxx
ksp
ktr
ktx
ktz
kwd
kwt
lasxml
latex
lbd
lbe
les
lha
link66
list
list3820
listafp
lnk
log
lostxml
lrf
lrm
ltf
lvp
lwp
lzh
m13
m14
m1v
m21
m2a
m2v
m3a
m3u
m3u8
m4a
m4u
m4v
ma
mads
mag
maker
man
mar
mathml
mb
mbk
mbox
mc1
mcd
mcurl
mdb
mdi
me
mesh
meta4
metalink
mets
mfm
mft
mgp
mgz
mid
midi
mie
mif
mime
mj2
mjp2
mk3d
mka
mks
mkv
mlp
mmd
mmf
mmr
mng
mny
mobi
mods
mov
movie
mp2
mp21
mp2a
mp3
mp4
mp4a
mp4s
mp4v
mpc
mpe
mpeg
mpg
mpg4
mpga
mpkg
mpm
mpn
mpp
mpt
mpy
mqy
mrc
mrcx
ms
mscml
mseed
mseq
msf
msh
msi
msl
msty
mts
mus
musicxml
mvb
mwf
mxf
mxl
mxml
mxs
mxu
n-gage
n3
nb
nbp
nc
ncx
nfo
ngdat
nitf
nlu
nml
nnd
nns
nnw
npx
nsc
nsf
ntf
nzb
oa2
oa3
oas
obd
obj
oda
odb
odc
odf
odft
odg
odi
odm
odp
ods
odt
oga
ogg
ogv
ogx
omdoc
onepkg
onetmp
onetoc
onetoc2
opf
opml
oprc
org
osf
osfpvg
otc
otf
otg
oth
oti
otp
ots
ott
oxps
oxt
p
p10
p12
p7b
p7c
p7m
p7r
p7s
p8
pas
paw
pbd
pbm
pcap
pcf
pcl
pclxl
pct
pcurl
pcx
pdb
pdf
pfa
pfb
pfm
pfr
pfx
pgm
pgn
pgp
pic
pkg
pki
pkipath
plb
plc
plf
pls
pml
png
pnm
portpkg
pot
potm
potx
ppam
ppd
ppm
pps
ppsm
ppsx
ppt
pptm
pptx
pqa
prc
pre
prf
ps
psb
psd
psf
pskcxml
ptid
pub
pvb
pwn
pya
pyv
qam
qbo
qfx
qps
qt
qwd
qwt
qxb
qxd
qxl
qxt
ra
ram
rar
ras
rcprofile
rdf
rdz
rep
res
rgb
rif
rip
ris
rl
rlc
rld
rm
rmi
rmp
rms
rmvb
rnc
roa
roff
rp9
rpss
rpst
rq
rs
rsd
rss
rtf
rtx
s
s3m
saf
sbml
sc
scd
scm
scq
scs
scurl
sda
sdc
sdd
sdkd
sdkm
sdp
sdw
see
seed
sema
semd
semf
ser
setpay
setreg
sfd-hdstx
sfs
sfv
sgi
sgl
sgm
sgml
sh
shar
shf
sid
sig
sil
silo
sis
sisx
sit
sitx
skd
skm
skp
skt
sldm
sldx
slt
sm
smf
smi
smil
smv
smzip
snd
snf
so
spc
spf
spl
spot
spp
spq
spx
sql
src
srt
sru
srx
ssdl
sse
ssf
ssml
st
stc
std
stf
sti
stk
stl
str
stw
sub
sub
sus
susp
sv4cpio
sv4crc
svc
svd
svg
svgz
swa
swf
swi
sxc
sxd
sxg
sxi
sxm
sxw
t
t3
taglet
tao
tar
tcap
tcl
teacher
tei
teicorpus
tex
texi
texinfo
text
tfi
tfm
tga
thmx
tif
tiff
tmo
torrent
tpl
tpt
tr
tra
trm
tsd
tsv
ttc
ttf
ttl
twd
twds
txd
txf
txt
u32
udeb
ufd
ufdl
ulx
umj
unityweb
uoml
uri
uris
urls
ustar
utz
uu
uva
uvd
uvf
uvg
uvh
uvi
uvm
uvp
uvs
uvt
uvu
uvv
uvva
uvvd
uvvf
uvvg
uvvh
uvvi
uvvm
uvvp
uvvs
uvvt
uvvu
uvvv
uvvx
uvvz
uvx
uvz
vcard
vcd
vcf
vcg
vcs
vcx
vis
viv
vob
vor
vox
vrml
vsd
vsf
vss
vst
vsw
vtu
vxml
w3d
wad
wav
wax
wbmp
wbs
wbxml
wcm
wdb
wdp
weba
webm
webp
wg
wgt
wks
wm
wma
wmd
wmf
wml
wmlc
wmls
wmlsc
wmv
wmx
wmz
wmz
woff
woff2
wpd
wpl
wps
wqd
wri
wrl
wsdl
wspolicy
wtb
wvx
x32
x3d
x3db
x3dbz
x3dv
x3dvz
x3dz
xaml
xap
xar
xbap
xbd
xbm
xdf
xdm
xdp
xdssc
xdw
xenc
xer
xfdf
xfdl
xht
xhtml
xhvml
xif
xla
xlam
xlc
xlf
xlm
xls
xlsb
xlsm
xlsx
xlt
xltm
xltx
xlw
xm
xml
xo
xop
xpi
xpl
xpm
xpr
xps
xpw
xpx
xsl
xslt
xsm
xspf
xul
xvm
xvml
xwd
xyz
xz
yang
yin
z1
z2
z3
z4
z5
z6
z7
z8
zaz
zip
zir
zirz
zmm

When using mimetype, supported types will depend on your mime database: cat /usr/share/mime/types. See: http://manpages.ubuntu.com/manpages/xenial/en/man1/mimetype.1p.html

mime file type magic-number file-signature

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