Running Python on Windows for Node js dependencies

Question

I am getting into a Node js codebase which requires that I download a few dependencies via NPM  namely jQuery   In attempting to run npm install jquery  I keep getting this error   Your environment has been set up for using Node js 0 8 21  x64  and NPM  C  Users Matt Cashatt gt npm install jquery npm http GET https   registry npmjs org jquery npm http 304 https   registry npmjs org jquery npm http GET https   registry npmjs org jsdom npm http GET https   registry npmjs org xmlhttprequest npm http GET https   registry npmjs org htmlparser 1 7 6 npm http GET https   registry npmjs org location 0 0 1 npm http GET https   registry npmjs org navigator npm http GET https   registry npmjs org contextify npm http 304 https   registry npmjs org htmlparser 1 7 6 npm http 304 https   registry npmjs org xmlhttprequest npm http 304 https   registry npmjs org location 0 0 1 npm http 304 https   registry npmjs org navigator npm http 304 https   registry npmjs org jsdom npm http 304 https   registry npmjs org contextify npm http GET https   registry npmjs org bindings npm http GET https   registry npmjs org cssom npm http GET https   registry npmjs org cssstyle npm http GET https   registry npmjs org request npm http 304 https   registry npmjs org bindings   gt  contextify 0 1 4 install C  Users Matt Cashatt node modules jquery node module s contextify  gt  node-gyp rebuild   C  Users Matt Cashatt node modules jquery node modules contextify gt node  C  Progr am Files nodejs node modules npm bin node-gyp-bin        node modules node-gyp b in node-gyp js  rebuild npm http 304 https   registry npmjs org cssstyle npm http 304 https   registry npmjs org cssom npm http 304 https   registry npmjs org request gyp ERR  configure error gyp ERR  stack Error  Can t find Python executable  python   you can set the PYT HON env variable  gyp ERR  stack     at failNoPython  C  Program Files nodejs node modules npm nod e modules node-gyp lib configure js 113 14  gyp ERR  stack     at C  Program Files nodejs node modules npm node modules node -gyp lib configure js 82 11 gyp ERR  stack     at Object oncomplete  fs js 297 15  gyp ERR  System Windows NT 6 1 7601 gyp ERR  command  node   C   Program Files  nodejs  node modules  npm  node modu les  node-gyp  bin  node-gyp js   rebuild  gyp ERR  cwd C  Users Matt Cashatt node modules jquery node modules contextify gyp ERR  node -v v0 8 21 gyp ERR  node-gyp -v v0 8 4 gyp ERR  not ok npm ERR  error rolling back Error  ENOTEMPTY  rmdir  C  Users Matt Cashatt node  modules jquery node modules jsdom node modules request tests  npm ERR  error rolling back  jquery 1 8 3    Error  ENOTEMPTY  rmdir  C  Users M att Cashatt node modules jquery node modules jsdom node modules request tests   npm ERR  error rolling back   errno  53  npm ERR  error rolling back   code   ENOTEMPTY   npm ERR  error rolling back   path   C   Users  Matt Cashatt  node modules  jque ry  node modules  jsdom  node modules  request  tests    npm ERR  contextify 0 1 4 install   node-gyp rebuild  npm ERR   cmd   c   node-gyp rebuild   failed with 1 npm ERR  npm ERR  Failed at the contextify 0 1 4 install script  npm ERR  This is most likely a problem with the contextify package  npm ERR  not with npm itself  npm ERR  Tell the author that this fails on your system  npm ERR      node-gyp rebuild npm ERR  You can get their info via  npm ERR      npm owner ls contextify npm ERR  There is likely additional logging output above   npm ERR  System Windows NT 6 1 7601 npm ERR  command  C   Program Files  nodejs    node exe   C   Program Files  nod ejs  node modules  npm  bin  npm-cli js   install   jquery  npm ERR  cwd C  Users Matt Cashatt npm ERR  node -v v0 8 21 npm ERR  npm -v 1 2 11 npm ERR  code ELIFECYCLE npm ERR  Error  ENOENT  lstat  C  Users Matt Cashatt node modules jquery node mo dules jsdom node modules request tests test-pipes js  npm ERR  If you need help  you may report this log at  npm ERR       lt http   github com isaacs npm issues gt  npm ERR  or email it to  npm ERR       lt npm- googlegroups com gt   npm ERR  System Windows NT 6 1 7601 npm ERR  command  C   Program Files  nodejs    node exe   C   Program Files  nod ejs  node modules  npm  bin  npm-cli js   install   jquery  npm ERR  cwd C  Users Matt Cashatt npm ERR  node -v v0 8 21 npm ERR  npm -v 1 2 11 npm ERR  path C  Users Matt Cashatt node modules jquery node modules jsdom node  modules request tests test-pipes js npm ERR  fstream path C  Users Matt Cashatt node modules jquery node modules jsd om node modules request tests test-pipes js npm ERR  fstream type File npm ERR  fstream class FileWriter npm ERR  code ENOENT npm ERR  errno 34 npm ERR  fstream stack C  Program Files nodejs node modules npm node modules fst ream lib writer js 284 26 npm ERR  fstream stack Object oncomplete  fs js 297 15  npm ERR  npm ERR  Additional logging details can be found in  npm ERR      C  Users Matt Cashatt npm-debug log npm ERR  not ok code 0  C  Users Matt Cashatt gt    It looks like the failure is due to a missing Python installation   Well  I have installed Python  set the variable  and rebooted and still the error   Any clue as to what I am missing

User · Answer

gyp ERR  configure error   gyp ERR  stack Error  Can t find Python executable  python   you can set the PYT   HON env variable    Not necessary to reinstall  this exception throw by node-gyp script  then try to rebuild  It s enough setup environment variable like in my case I did   SET PYTHON C  work  env Python27 python exe

User · Answer

For me after installing windows-build-tools with the below comment   npm --add-python-to-path  true  --debug install --global windows-build-tools   running the code below  npm config set python   USERPROFILE   windows-build-tools python27 python exe    has worked

User · Answer

For me  The issue was that i was using node s latest version and not the LTS version which is the stable version and recommended for most users   Using the LTS Version solved the issue  You can download from here    LTS Version  Current Latest Version

User · Answer

If you re trying to use this on Cygwin  then you need to follow the instructions in this answer   It s a problem how Cygwin treats Windows symlinks

User · Answer

Set path like below and it will work  gt  set PYTHON D   ranjith  installed  python-3 6 4  python exe   gt  npm config set python D   ranjith  installed  python-3 6 4  python exe  Then build your project  for me like   gt  yarn build

User · Answer

Here is the correct command  set path  path  C  Python34   Replace with the correct path of your python installation   I had the same problem and I just solved this like that   As some other people pointed out  this is volatile configuration  it only works for the current cmd session  and  obviously  you have to set your path before you run npm install   I hope this helps

User · Answer

Your problem is that you didn t set the environment variable   The error clearly says this   gyp ERR  stack Error  Can t find Python executable  python   you can set the PYTHON env variable    And in your comment  you say you did this   set PYTHONPATH  PYTHONPATH  C  My python lib   That s nice  but that doesn t set the PYTHON variable  it sets the PYTHONPATH variable     Meanwhile  just using the set command only affects the current cmd session  If you reboot after that  as you say you did  you end up with a whole new cmd session that doesn t have that variable set in it   There are a few ways to set environment variables permanently   the easiest is in the System Control Panel in XP  which is of course different in Vista  different again in 7  and different again in 8  but you can google for it   Alternatively  just do the set right before the npm command  without rebooting in between     You can test whether you ve done things right by doing the exact same thing the config script is trying to do  Before running npm  try running  PYTHON   If you ve done it right  you ll get a Python interpreter  which you can immediately quit   If you get an error  you haven t done it right     There are two problems with this   set PYTHON  PYTHON  D  Python   First  you re setting PYTHON to  D  Python  That extra semicolon is fine for a semicolon-separated list of paths  like PATH or PYTHONPATH  but not for a single value like PYTHON  And likewise  adding a new value to the existing value is what you want when you want to add another path to a list of paths  but not for a single value  So  you just want set PYTHON D  Python   Second  D  Python is not the path to your Python interpreter  It s something like D  Python Python exe  or D  Python bin Python exe  Find the right path  make sure it works on its own  e g   type D  Python bin Python exe and make sure you get a Python interpreter   then set the variable and use it     So   set PYTHON D  Python bin Python exe   Or  if you want to make it permanent  do the equivalent in the Control Panel

User · Answer

I had the same issue and none of these answers did help  In my case PYTHON variable was set correctly  However python was installed too deep  i e  has too long path  So  I did the following     reinstalled python to c  python set environmental variable PYTHON to C  python python exe   And that   s it

User · Answer

This is most easiest way to let NPM do everything for you  npm --add-python-to-path  true  --debug install --global windows-build-tools

User · Answer

This helped  https   www npmjs com package node-gyp  I followed these steps   npm install -g node-gyp   then   npm install --global --production windows-build-tools

User · Answer

For me  these steps fixed the issue   1- Running this cmd as admin   npm install --global --production windows-build-tools  2- Then running npm rebuild after the 1st step is completed  especially completing the python 2 7 installation  which was the main cause of the issue

User · Answer

I met the same challenge while trying to install node-sass 4 9 4   And after looking at the current official documentation  and having read the answers above  i noticed that you might not necessarily have to install node-gyp nor install windows-build tools  This is what it says  here about installing node-gyp on windows  Remember node-gyp is involved in the installation process of node-sass  And you don t really have to re-install another python version   This is the savior  configure the python path that  npm  should look for while installing any packages that require build-tools   C   gt  npm config set python  Python36 python   I had installed python3 6 3  on windows-7  there

User · Answer

Here is a guide that resolved a lot of these issues for me   http   www steveworkman com node-js 2012 installing-jsdom-on-windows   I remember in particular the python version as important   Make sure you install 2 7 3 instead of 3 s

User · Answer

Example   pg config not executable   error node-gyp  Solution   On windows just try to add PATH Env -  C  Program Files PostgreSQL 12 bin  Work for me  Now i can use npm i pg-promise for example or other dependencies

User · Answer

Why not downloading the python installer here   It make the work for you when you check the path installation

User · Answer

If you haven t got python installed along with all the node-gyp dependencies  simply open Powershell or Git Bash with administrator privileges and execute    npm install --global --production windows-build-tools   and then to install the package   npm install --global node-gyp   once installed  you will have all the node-gyp dependencies downloaded  but you still need the environment variable  Validate Python is indeed found in the correct folder    C  Users ben  windows-build-tools python27 python exe    Note - it uses python 2 7 not 3 x as it is not supported  If it doesn t moan  go ahead and create your  user  environment variable   setx PYTHON   USERPROFILE   windows-build-tools python27 python exe    restart cmd  and verify the variable exists via set PYTHON which should return the variable   Lastly re-apply npm install  lt module gt

User · Answer

The following worked for me from the command line as admin   Installing windows-build-tools  this can take 15-20 minutes     npm --add-python-to-path  true  --debug install --global windows-build-tools   Adding updating the environment variable   setx PYTHON   USERPROFILE   windows-build-tools python27 python exe    Installing node-gyp   npm install --global node-gyp   Changing the name of the exe file from Python to Python2 7   C  Users username  windows-build-tools python27 Python2 7   npm install module name --save

User · Answer

TL DR  Make a copy or alias of your python exe with name python2 7 exe   My python 2 7 was installed as D  app Python27 python exe  I always got this error no matter how I set  and verified  PYTHON env variable    gyp ERR  stack Error  Can t find Python executable  python2 7   you can set the PYTHON env variable  gyp ERR  stack     at failNoPython  C  Program Files nodejs node modules npm node modules node-gyp lib configure js 103 14    The reason for this was that in node-gyp s configure js the python executable was resolved like   var python   gyp opts python    process env PYTHON     python   And it turned out that gyp opts python had value  python2 7  thus overriding process env PYTHON   I resolved this by creating an alias for python exe executable with name node-gyp was looking for   D  app Python27 mklink python2 7 exe python exe  You need admin rights for this operation

User · Answer

there are some solution to solve this issue   1   run your command prompt as  administrator    if first solution doesn t solve your problem try this one    2   open a command prompt as administrator paste following line of code and hit enter    npm install --global --production windows-build-tools

User · Answer

i can t help but to mention this  If you re using Python3 and failing with node-gyp  then i m sad to tell you node-gyp currently doesn t support python3   Here is a link for you   https   github com nodejs node-gyp issues 1268 https   github com nodejs node-gyp issues 193

User · Answer

The right way is  1  Download and Install python 2 7 14 from here  2  Set environment variable for python from here   done   note  Please set environment variable accordingly  I answered here for windows

User · Answer

One and or multiple of those should help    Add C  Python27  to your PATH variable  considering you have Python installed in this directory  How to set PATH env variable  http   www computerhope com issues ch000549 htm Restart your console and or Windows after setting variable  In the same section as above   Environment Variables    add new variable with name PYTHON and value C  Python27 python exe Restart your console and or Windows after setting variable  Open Windows command line  cmd  in Admin mode  Change directory to your Python installation path  cd C  Python27 Make symlink needed for some installations  mklink python2 7 exe python exe   Please note that you should have Python 2 x  NOT 3 x  to run node-gyp based installations   The text below says about Unix  but Windows version also requires Python 2 x   You can install with npm     npm install -g node-gyp You will also need to install   On Unix  python  v2 7 recommended  v3 x x is not supported  make A proper C C   compiler toolchain  like GCC   This article may also help  https   github com nodejs node-gyp installation

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