Why does npm install say I have unmet dependencies

Question

I have a node package  When I run npm install from the package root  it installs a bunch of things  but then prints several error messages that look like this      npm WARN unmet dependency  Users seanmackesey google drive code explore generator node modules findup-sync node modules glob requires graceful-fs   1 2 0  but will load   I must be confused about what exactly npm install does  If it detects a dependency  shouldn t it install it  Under what conditions does it give me error messages like this  and how can I resolve the dependencies

User · Accepted Answer

I believe it is because the dependency resolution is a bit broken, see https://github.com/npm/npm/issues/1341#issuecomment-20634338

Following are the possible solution :

Manually need to install the top-level modules, containing unmet dependencies: npm install [email protected]
Re-structure your package.json. Place all the high-level modules (serves as a dependency for others modules) at the bottom.
Re-run the npm install command.

The problem could be caused by npm's failure to download all the package due to timed-out or something else.

Note: You can also install the failed packages manually as well using npm install [email protected].

Before running npm install, performing the following steps may help:

remove node_modules using rm -rf node_modules/
run npm cache clean

Why 'removing node_modules' sometimes is necessary? When a nested module fails to install during npm install, subsequent npm install won't detect those missing nested dependencies.

If that's the case, sometimes it's sufficient to remove the top-level dependency of those missing nested modules, and running npm install again. See

User · Answer

Updating to 4 0 0  Updating to 4 is as easy as updating your Angular dependencies to the latest version  and double checking if you want animations  This will work for most use cases   On Linux Mac    npm install  angular  common compiler compiler-cli core forms http platform-browser platform-browser-dynamic platform-server router animations  latest typescript latest --save    On Windows   npm install  angular common latest  angular compiler latest  angular compiler-cli latest  angular core latest  angular forms latest  angular http latest  angular platform-browser latest  angular platform-browser-dynamic latest  angular platform-server latest  angular router latest  angular animations latest typescript latest --save   Then run whatever ng serve or npm start command you normally use  and everything should work   If you rely on Animations  import the new BrowserAnimationsModule from  angular platform-browser animations in your root NgModule  Without this  your code will compile and run  but animations will trigger an error  Imports from  angular core were deprecated  use imports from the new package   import   trigger  state  style  transition  animate   from   angular animations

User · Answer

I fixed the issue by using these command lines      rm -rf node modules     sudo npm update -g npm   npm install   It s done

User · Answer

This solved it for me    Correct the version numbers in package json  according to the errors  Remove node modules  rm -rf node modules   Rerun npm install    Repeat these steps until there are no more errors

User · Answer

I was trying to work on an automated deployment system that runs npm install  so a lot of these solutions wouldn t work for me in an automated fasion  I wasn t in a position to go deleting re-creating node modules  nor could I easily change Node js versions   So I ended up running npm shrinkwrap - adding the npm-shrinkwrap json file to my deployment bundle  and running installs from there  That fixed the problem for me  with the shrinkwrap file as a  helper   npm seemed to be able to find the right packages and get them installed for me   Shrinkwrap has other features as well  but this was what I needed it for in this particular case

User · Answer

--dev installing devDependencies recursively  and its run forever    how it can help to resolve the version differences    You can try remove the node moduls folder  then clean the npm cache and then run  npm i  again

User · Answer

I encountered this problem when I was installing react packages and this worked for me       npm install --save  lt package causing this error gt

User · Answer

Some thing in the similar vein  I would add one other step   Note that on npm version   1 4 9   npm install  does install devDependencies  First try removing existing modules and cache   remove node modules   rm -rf node modules  run   npm cache clean   Then try   npm install --dev npm update --dev   This at least will resolve the recursive dependency resolution

User · Answer

I run npm list and installed all the packages listed as UNMET DEPENDENCY  For instance    -- UNMET DEPENDENCY css-loader  0 23 1  npm install css-loader  0 23 1

User · Answer

It happened to me when the WIFI went down during an npm install  Removing node modules and re-running npm install fixed it

User · Answer

In my case  the update of npm solved it   sudo npm install -g npm

User · Answer

Upgrading NPM to the latest version can greatly help with this  dule s answer above is right to say that dependency management is a bit broken  but it seems that this is mainly for older versions of npm   The command npm list gives you a list of all installed node modules  When I upgraded from version 1 4 2 to version 2 7 4  many modules that were previously flagged with WARN unmet dependency were no longer noted as such   To update npm  you should type npm install -g npm on MacOSX or Linux   On Windows  I found that re-downloading and re-running the nodejs installer was a more effective way to update npm

User · Answer

I had a similar issue while I was installing the React Native CLI  I wasn t sure which  node modules directory I was supposed to remove after reading the answers here  I eventually just ran  npm update -g  and was able to install the package after that

User · Answer

The above answers didn t help me fully even after deleteting node modules directory   Below command helped me finally    npm config set registry http   registry npmjs org    Note that this pulls node modules over an insecure HTTP connection    Src  https   stackoverflow com a 13119867 4082503

User · Answer

Take care about your angular version  if you work under angular 2 x x so maybe you need to upgrade to angular 4 x x  Some dependencies needs angular 4  Here is a tutorial for how to install angular 4 or update your project

User · Answer

npm install will install all the packages from npm-shrinkwrap json  but might ignore packages in package json  if they re not preset in the former   If you re project has a npm-shrinkwrap json  make sure you run npm shrinkwrap to regenerate it  each time you add add remove change package json

User · Answer

For every -- UNMET PEER DEPENDENCY  for ex  -- UNMET PEER DEPENDENCY rxjs 5 0 0-rc 2  install that dependency with npm install --save rxjs 5 0 0-rc 2 until you don t have any more UNMET DEPENDENCIES   Good Luck

[node.js] Why does npm install say I have unmet dependencies?

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