By Vishal Basumatary in javascript — Mar 23, 2023

npm ERR! code ERESOLVE npm ERR! ERESOLVE unable to resolve dependency tree npm ERR! npm ERR! While resolving: [email protected] npm ERR! Found: [email protected] npm ERR! node_modules/react npm ERR! react@"^18.2.0" from the root project npm ERR! npm ERR! Cou

npm ERR! code ERESOLVE

If you are using Node.js for your project, you might have encountered the error "npm ERR! code ERESOLVE npm ERR! ERESOLVE unable to resolve dependency tree". This error occurs when npm is unable to resolve the dependencies of your project.

What causes this error?

This error occurs when there is a conflict between the versions of the dependencies required by your project. For example, if your project requires version 1 of a dependency, but another dependency in your project requires version 2 of the same dependency, there will be a conflict and npm will not be able to resolve the dependencies.

How to fix this error?

There are a few ways to fix this error:

Update your dependencies: Check if there are any updates available for your dependencies and update them to the latest version. This might resolve the conflict between the versions of the dependencies.
Remove node_modules directory: Remove the node_modules directory from your project and run npm install again. This will reinstall all the dependencies from scratch.
Use npm ci: Instead of npm install, use npm ci. This will install the exact versions of the dependencies as specified in your package-lock.json file.

Example:


npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/react
npm ERR! react@"^18.2.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"17.x" from @material-ui/[email protected]
npm ERR! node_modules/@material-ui/core
npm ERR! @material-ui/core@"^4.11.4" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See /Users/Raju/.npm/eresolve-report.txt for a full report.

In the above example, npm is unable to resolve the dependency tree of the confusion project. It found version 18.2.0 of the react dependency, but there is another dependency (@material-ui/core) that requires version 17.x of react. This creates a conflict and npm is unable to resolve the dependencies.