Node js Python not found exception due to node-sass and node-gyp

Question

Suddenly in one of my jenkins environment build has started failing  while in local machine it seems to be working fine as i have python installed   From the logs i was able to detect that the problem is with internal dependency that is node-gyp v3 5 0 from node-sass v3 8 0 when i researched by visiting this about node-gyp and found the prerequisite that Python needs to be installed   So my question is that what version of node-sass can i install to bypass this or is there a better solution as my build was running fine till this morning on the same environment   Node v5 10 1  ERROR LOG  gyp verb check python checking for Python executable  python2  in the PATH gyp verb  which  failed Error  not found  python2 gyp verb  which  failed     at getNotFoundError  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 13 12  gyp verb  which  failed     at F  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 68 19  gyp verb  which  failed     at E  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 80 29  gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 89 16 gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules isexe index js 44 5 gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules isexe windows js 29 5 gyp verb  which  failed     at FSReqWrap oncomplete  fs js 82 15  gyp verb  which  failed  python2    Error  not found  python2  code   ENOENT    gyp verb check python checking for Python executable  python  in the PATH gyp verb  which  failed Error  not found  python gyp verb  which  failed     at getNotFoundError  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 13 12  gyp verb  which  failed     at F  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 68 19  gyp verb  which  failed     at E  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 80 29  gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules which which js 89 16 gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules isexe index js 44 5 gyp verb  which  failed     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules isexe windows js 29 5 gyp verb  which  failed     at FSReqWrap oncomplete  fs js 82 15  gyp verb  which  failed  python    Error  not found  python  code   ENOENT    gyp verb could not find  python   checking python launcher  gyp verb could not find  python   guessing location  gyp verb ensuring that file exists  C  Python27 python exe gyp ERR  configure error  gyp ERR  stack Error  Can t find Python executable  python   you can set the PYTHON env variable  gyp ERR  stack     at Object failNoPython  C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules node-gyp lib configure js 454 19  gyp ERR  stack     at Object  lt anonymous gt   C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules node-gyp lib configure js 480 16  gyp ERR  stack     at C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules graceful-fs polyfills js 284 29 gyp ERR  stack     at FSReqWrap oncomplete  fs js 82 15  gyp ERR  System Windows NT 6 3 9600 gyp ERR  command  C   Program Files  nodejs  node exe   C   Program Files  x86   Jenkins  jobs  NdbSite-hot-fix-Manual-PreBuild  workspace  src  NdbSite UI  node modules  node-gyp  bin  node-gyp js   rebuild   --verbose   --libsass ext    --libsass cflags    --libsass ldflags    --libsass library   gyp ERR  cwd C  Program Files  x86  Jenkins jobs NdbSite-hot-fix-Manual-PreBuild workspace src NdbSite UI node modules node-sass gyp ERR  node -v v5 10 1 gyp ERR  node-gyp -v v3 5 0 gyp ERR  not ok  Build failed   Any thoughts are much appreciated  Thanks

User · Answer

Hey I got this error resolved by  following the steps  first I uninstalled python 3 8 6  latest version  then I installed python 2 7 1  any Python 2 version will work  but not much older and this is recommended  then I added c  python27 to environment variables my OS is windows  so I followed this link It worked

User · Answer

The error message means that it cannot locate your python executable or binary  In many cases  it s installed at c  python27  if it s not installed yet  you can install it with npm install --global windows-build-tools  which will only work if it hasn t been installed yet  Adding it to the environment variables does not always work  A better alternative  is to just set it in the npm config  npm config set python c  python27 python exe

User · Answer

After looking at all the answers  i notice this solution might be very helpful  It explains how to configure  npm  to find your installed python version while installing node-sass  Remember  node-sass requires node-gyp  an npm build-tool  which looks for your python path  Or just install python  and follow the same solution given  in the link   Thanks

User · Answer

node-gyp requires old Python 2 - link If you don t have it installed - check other answers about installing windows-build-tools  If you are like me and have both old and new Python versions installed  chances are that node-gyp tries to use Python 3  And that results in the following SyntaxError  invalid syntax error  I found an article about having two Python versions installed  And they recommend renaming Python 2   executable to python2 exe - link  So it looks like node-gyp is expecting to find old Python 2 executable renamed  Hence the error message      gyp verb check python checking for Python executable  quot python2 quot  in the PATH gyp verb  which  failed Error  not found  python2      Once I renamed C  Python27 python exe to C  Python27 python2 exe it worked without errors  Of course  both C  Python27  and C  Python39  have to be in PATH variable  And no need in setting old Python version in npm config  Your default Python still will be the new one

User · Answer

I had to   Delete node modules Uninstall reinstall node npm install node-sass 4 12 0   worked fine after forcing it to the right sass version  according to the version said to be working with the right node    NodeJS  Minimum node-sass version   Node Module Node 12 4 12    72 Node 11 4 10    67 Node 10 4 9     64 Node 8  4 5 3   57   There was lots of other errors that seemed to be caused by the wrong sass version defined

User · Answer

I found the same issue with Node 12 19 0 and yarn 1 22 5 on Windows 10  I fixed the problem by installing latest stable python 64-bit with adding the path to Environment Variables during python installation  After python installation  I restarted my machine for env vars

User · Answer

My answer might not apply to everyone  Node version  v10 16 0 NPM  6 9 0  I was having a lot of trouble using node-sass and node-sass-middleware  They are interesting packages because they are widely used  millions of downloads weekly   but their githubs show a limited dependencies and coverage  I was updating an older platform I d been working on   What I ended up having to do was   1  Manually Delete node modules  2  Manually Delete package-lock json  3  sudo npm install node-sass --unsafe-perm true --allow-root  4  sudo npm install node-sass-middleware --unsafe-perm true --allow-root  I had the following help  thanks   Pre-built binaries not found for grpc 1 10 1 and node 10 9 0  Error  EACCES  permission denied when trying to install ESLint using npm

User · Answer

My machine is Windows 10  I ve faced similar problems while tried to compile SASS using node-sass package  My node version is v10 16 3 and npm version is 6 9 0  The way that I resolved the problem    At first delete package-lock json file and node modules  folder  Open Windows PowerShell as Administrator  Run the command npm i -g node-sass  After that  go to the project folder and run npm install And finally  run the SASS compiling script  in my case  it is npm run build css   And it works

User · Answer

I had node 15 x x   and  quot node-sass quot    quot  4 11 0 quot   I saw in the release notes from node-sass and saw the node higest version compatible with node-sass 4 11 0 was 11  so I uninstalled node and reinstall 11 15 0 version  I m working with Windows   Check node-sass releases   this is what you should see in the node-sass releases   Hope that helps and sorry for my english

User · Answer

Node-sass tries to download the binary for you platform when installing  Node 5 is supported by 3 8 https   github com sass node-sass releases tag v3 8 0 If your Jenkins can t download the prebuilt binary  then you need to follow the platform requirements on Node-gyp README  Python2  VS or MSBuild       If possible I d suggest updating your Node to at least 6 since 5 isn t supported by Node anymore  If you want to upgrade to 8  you ll need to update node-sass to 4 5 3

User · Answer

This is 2 years old  but none of them helped me   I uninstalled my NodeJS v12 8 1  Current  and installed a brand new v10 16 3  LTS  and my ng build --prod worked

User · Answer

so this happened to me on windows recently  I fix it by following the following steps using a PowerShell with admin privileges    delete node modulesfolder running npm install --global windows-build-tools   reinstalling node modules or node-sass with npm install

User · Answer

had the same issue lost hours trying to install different version of python on my PC  Simply Upgrade node to the latest version v8 11 2 and npm 5 6 0  then after install node-sass 4 5 3 and you ll be fine

[node.js] Node.js: Python not found exception due to node-sass and node-gyp

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