npm ERR! code ERESOLVE unable to resolve dependency tree
TL;DRThis error occurs when the npm package manager cannot install the required software packages because different packages demand conflicting versions of the same supporting library.
Likely causes
- Conflicting version requirements listed in the project's package.json or its dependenciesmost likely
- Newer npm versions enforcing stricter dependency rules that older projects do not meetpossible
- One or more packages being outdated and no longer compatible with each otherless likely
How to fix it
Safest first: SafeChanges settingsDangerous
View the package.json file to inspect current dependenciesSafe
Open the project folder and look at the package.json file to see which packages are listed.
cat package.jsonUpdate packages to compatible versionsSafe
Use npm to check for and apply updates that may resolve conflicts.
npm outdatedTry installing with legacy peer dependency flagChanges settings
Run the install command again while allowing older-style dependency resolution.
npm install --legacy-peer-deps
If that didn't fix it
If the error remains, manually adjust version numbers in package.json or delete the node_modules folder and package-lock.json then retry install.
When to see a technician
Consult a developer experienced with Node.js projects if editing dependency files feels unsafe.
Related errors
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