Node js Error Cannot find module express

Question

I wrote my first node js app  but it can t find express library   C  ChatServer Server gt node server js  module js 340     throw err              Error  Cannot find module  express      at Function Module  resolveFilename  module js 338 15      at Function Module  load  module js 280 25      at Module require  module js 364 17      at require  module js 380 17      at Object  lt anonymous gt   C  ChatServer Server server js 6 9      at Object  lt anonymous gt   C  ChatServer Server server js 25 4      at Module  compile  module js 456 26      at Object Module  extensions  js  module js 474 10      at Module load  module js 356 32      at Function Module  load  module js 312 12    But express is intalled  with -g key    C  ChatServer Server gt npm install -g express npm http GET https   registry npmjs org express npm http 304 https   registry npmjs org express npm http GET https   registry npmjs org connect 2 7 11 npm http GET https   registry npmjs org commander 0 6 1 npm http GET https   registry npmjs org range-parser 0 0 4 npm http GET https   registry npmjs org mkdirp 0 3 4 npm http GET https   registry npmjs org cookie 0 1 0 npm http GET https   registry npmjs org buffer-crc32 0 2 1 npm http GET https   registry npmjs org fresh 0 1 0 npm http GET https   registry npmjs org methods 0 0 1 npm http GET https   registry npmjs org send 0 1 0 npm http GET https   registry npmjs org cookie-signature 1 0 1 npm http GET https   registry npmjs org debug npm http 304 https   registry npmjs org mkdirp 0 3 4 npm http 304 https   registry npmjs org range-parser 0 0 4 npm http 304 https   registry npmjs org cookie 0 1 0 npm http 304 https   registry npmjs org connect 2 7 11 npm http 304 https   registry npmjs org commander 0 6 1 npm WARN package json range-parser 0 0 4 No repository field  npm http 304 https   registry npmjs org buffer-crc32 0 2 1 npm http 304 https   registry npmjs org fresh 0 1 0 npm http 304 https   registry npmjs org methods 0 0 1 npm http 304 https   registry npmjs org send 0 1 0 npm http 304 https   registry npmjs org cookie-signature 1 0 1 npm WARN package json methods 0 0 1 No repository field  npm WARN package json methods 0 0 1 No readme data  npm WARN package json fresh 0 1 0 No repository field  npm WARN package json send 0 1 0 No repository field  npm WARN package json cookie-signature 1 0 1 No repository field  npm http 304 https   registry npmjs org debug npm http GET https   registry npmjs org mime 1 2 6 npm http GET https   registry npmjs org qs 0 6 5 npm http GET https   registry npmjs org send 0 1 1 npm http GET https   registry npmjs org formidable 1 0 14 npm http GET https   registry npmjs org cookie 0 0 5 npm http GET https   registry npmjs org bytes 0 2 0 npm http GET https   registry npmjs org pause 0 0 1 npm http 304 https   registry npmjs org mime 1 2 6 npm http 304 https   registry npmjs org bytes 0 2 0 npm WARN package json bytes 0 2 0 No repository field  npm http 304 https   registry npmjs org pause 0 0 1 npm WARN package json pause 0 0 1 No repository field  npm http 304 https   registry npmjs org formidable 1 0 14 npm http 304 https   registry npmjs org qs 0 6 5 npm http 304 https   registry npmjs org send 0 1 1 npm http 304 https   registry npmjs org cookie 0 0 5 npm http GET https   registry npmjs org mime npm http 304 https   registry npmjs org mime C  Users Dmitry AppData Roaming npm express - gt  C  Users Dmitry AppData Roaming npm node modules express bin express npm WARN package json policyfile 0 0 4  repositories   plural  Not supported  npm WARN package json Please pick one as the  repository  field npm WARN package json assert-plus 0 1 2 No repository field  npm WARN package json ctype 0 5 2 No repository field  express 3 2 6 C  Users Dmitry AppData Roaming npm node modules express  -- methods 0 0 1  -- fresh 0 1 0  -- range-parser 0 0 4  -- cookie-signature 1 0 1  -- buffer-crc32 0 2 1  -- cookie 0 1 0  -- debug 0 7 2  -- commander 0 6 1  -- mkdirp 0 3 4  -- send 0 1 0  mime 1 2 6   -- connect 2 7 11  pause 0 0 1  qs 0 6 5  bytes 0 2 0  cookie 0 0 5  formidable 1 0 14  send 0 1 1    Some information   C  ChatServer Server gt npm --version 1 2 24  C  ChatServer Server gt node --version v0 10 9  C  ChatServer Server gt npm --version 1 2 24  C  ChatServer Server gt npm ls -g installed express npm WARN package json cookie-signature 1 0 1 No repository field  npm WARN package json fresh 0 1 0 No repository field  npm WARN package json methods 0 0 1 No repository field  npm WARN package json range-parser 0 0 4 No repository field  npm WARN package json send 0 1 0 No repository field  npm WARN package json policyfile 0 0 4  repositories   plural  Not supported  npm WARN package json Please pick one as the  repository  field npm WARN package json bytes 0 2 0 No repository field  npm WARN package json pause 0 0 1 No repository field  npm WARN package json assert-plus 0 1 2 No repository field  npm WARN package json ctype 0 5 2 No repository field  C  Users Dmitry AppData Roaming npm  -- express 3 2 6   C  ChatServer Server gt npm ls installed express C  ChatServer Server  --  empty    How can I solve this problem   MUST I install it without -g

User · Answer

npm ERR  Error  ENOENT  open   Users feelexit package json   This happens due to missing permissions or unlinked files while npm was working   Meaning  that executing npm as this user doesn t have enough rights to read write from a file  in this case package json   try adding sudo before the entire command - it should resolve     sudo npm install -g express   Password          Password would be your admin password of your mac   -g flag will install this module  express  in the global context of node - meaning node will should recognize express module from within any js file without having to provide a full path to the module in use   Hope this helps

User · Answer

In rare cases  npm cache may get corrupt   For me  what worked was   npm cache clean --force   Generally  the package manager will detect corruption and refetch on its own so this is not usually necessary   However  in my case Windows 10 crashed a few times and I suspect this may have been during a fetch operation   Hope it helps someone   More information  https   docs npmjs com cli cache

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You have your express module located in a different directory than your project  That is probably the problem since you are trying to require   it locally  Try moving your express module from  Users feelexit nvm node modules express to  Users feelexit WebstormProjects learnnode node modules express  This info can give you more detail about node module file structures

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I had this error in vscode  although the modules where installed  I am using typescript and express  In the server ts files all the imports had red squiggly underlines  It turns out I had a faulty tsconfig json file          compileOnSave   false       compilerOptions              module    commonjs      Previously this value was  es6           target    es6            allowSyntheticDefaultImports   true           baseUrl    public            sourceMap   true           outDir    dist            jsx    react            strict   true           preserveConstEnums   true           removeComments   true           noImplicitAny   true           allowJs   true             exclude              node modules            build

User · Answer

Have you tried  npm install   If you re specifically looking for just express   npm install --save express

User · Answer

I ve came across a similar problem and in the end it was a matter of some old dependencies that were messing up my Heroku server   While at my project s folder I ve run   npm uninstall npm install   I hope it helps

User · Answer

for this scenario run npm install express command using your cmd prompt for the respective folder where you want to run the program  Example I want to run the express module program server js in F  nodeSample  So run  npm install express  in that particular folder then run server js

User · Answer

sudo brew uninstall node brew update brew upgrade brew cleanup brew install node sudo chown -R   whoami   usr local brew link --overwrite node sudo brew postinstall node   This worked for me on MacOS X Sierra

User · Answer

Unless you set Node PATH  the only other option is to install express in the app directory  like npm install express --save  Express may already be installed but node cannot find it for some reason

User · Answer

Check if you have installed express module  If not  use this command   npm install express   and if your node modules directory is in another place  set NODE PATH envirnment variable   set NODE PATH your directory to node modules  NODE PATH

User · Answer

Given you have installed node on your system  install Express locally for your project using the following for Windows   npm install express   or  npm install express --save   You might give it global access by using    npm install -g express --save

User · Answer

For me it worked when installed express locally with --save option as follow     npm install express --save

User · Answer

Check if you are not install express module  use this command    npm install express   and if your node modules directory is in another place  set NODE PATH envirnment variable    set NODE PATH your directory to node modules  NODE PATH

User · Answer

I had the same error following the example on this book   quot Kubernetes Up  amp  Running quot   I see many answers suggesting to install express  quot by hand quot  but I m not convinced is the best solution  Because we are using package json  I can see it in the logs  and the right way to build the app is running npm install  I added the express dependency in the package json file    quot dependencies quot          quot express quot    quot  4 17 1 quot     I get the current version with npm search express

User · Answer

Golo have explain well the solution  but I might add a clarification  sometimes node modules are installed in    usr local lib node modules   and when you launch node blabla js modules are searched in    lib   So a solution is to create a symbolic link   sudo ln -s  usr local lib node modules   lib node modules

User · Answer

In your case your express module is installed at C  Users Dmitry AppData Roaming npm node modules express  but you need to get this module in to your project directory  So you should copy the file the express module folders from C  Users Dmitry AppData Roaming npm node modules  to your project directory as   C  ChatServer Server node modules  If you do not have a folder named  node modules  in your project folder  then create it first and paste those files into this folder  This method worked for me on my windows pc  Restart your node server and once again run the command node C  ChatServer Server gt node server js  It should work now

User · Answer

You need to install Express locally into the context of your application  node modules folder      npm install express   The reason for this is that applications always look in their local context for any dependencies  The global installation is only for setting up system-wide available binaries  such as unit test runners or bootstrappers or things like that   With Express  when you install it globally  you get an express binary that can bootstrap an application for you  For more information  type    express --help   So  to answer your final question  YES  you need to install it without -g

User · Answer

Run npm install express body-parser cookie-parser multer --save command in the same directory with your source code nodejs file to resolve this issue  P s  check your directory after run command to understand more

User · Answer

It says Cannot find module  express   Do you have express installed  If not then run this  npm install express  and run your program again

User · Answer

I m guessing that this is coursework from Colt Steele s Web Development course    I was looking for the same answer as to why I ended up with that error too   Colt doesn t say so but you take the node module folder and move into the new folder you re working in    that s what worked for me

User · Answer

npm install from within your app directory will fix the issue as it will install everything required

User · Answer

installing express globally will not work on your local project so you need to install it locally for use    npm install express   Hope this will work  Thank you

User · Answer

I hit the same problem  I had express installed globally at  usr local bin   When I do  npm install   express was not created in node modules of local directory     Check if you have file name  npmrc in your  HOME If it has  global   true   change to  global   false  Now do  npm install  in application directory  More likely  you should get all package dependent modules installed in node modules  local  within application directory

User · Answer

go to your application directory and install the express module using the below command npm install express --save then list the all install module using the below command npm ls you will see all the locally install modules

User · Answer

if youre main file is located at  Users feelexit WebstormProjects learnnode node modules index js then express needs to be located at  Users feelexit WebstormProjects learnnode node modules node modules as node always looks for modules in   node modules  and its internal folder  when the path dont start with    or    more info here   i think you miss placed youre main file in the module folder

User · Answer

After you do express in your terminal  then do npm install  To install all the dependencies  Then you can do node app to run the server

User · Answer

Sometimes there are error while installing the node modules Try this   Delete node modules npm install

User · Answer

create one folder in your harddisk e g sample1 and go to command prompt type  cd and gives the path of sample1 folder  and then install all modules     npm install express npm install jade npm install socket io  and then whatever you are creating application save in sample1 folder try it

User · Answer

npm install --save express This worked for me  Just run express js installation again

User · Answer

I had the same problem  My issue was that I have to change to the Node js project directory on the command line before installing express   cd  Users feelexit WebstormProjects learnnode node modules

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Digging up an old thread here BUT I had this same error and I resolved by navigating to the directory my NodeApp resides in and running npm install -d

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On Ubuntu-based OS you can try  sudo apt-get install node-express   its working for me on Mint

User · Answer

D  learn Node js node app js module js 549     throw err         Error  Cannot find module  body-parser      at Function Module  resolveFilename  module js 547 15      at Function Module  load  module js 474 25      at Module require  module js 596 17      at require  internal module js 11 18    Sometimes version not match with package json Fixed the problem by checking the package json then use the following commands  npm install body-parser 1 13 2 it resolved for me

User · Answer

1 first check if express is install at correct location  2  npm install express  run this command   3  express will save under your  quot node modules quot  folder

User · Answer

I m not proud sharing this  but in my case I had    require  express handlebars       and the correct form is   require  express-handlebars      Use dash instead

[node.js] Node.js Error: Cannot find module express

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