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🐞 [BUG] "npm ERR! cb() never called!" or "Exit handler never called"

Fresh3 days ago
Mar 14, 20260 views
Confidence Score72%
72%

Problem

\Updated\ as of 01/15/2021 Note: Please read this doc-never-called%3F-Exit-handler-never-called%3F-I'm-having-the-same-problem!%22) before filing a new issue.

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Fix npm 'cb() never called!' Error

Medium Risk

The 'cb() never called!' error typically occurs due to issues with npm's cache, corrupted package installations, or conflicts between package versions. This can happen when npm is interrupted during installation or when there are network issues while fetching packages.

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  1. 1

    Clear npm cache

    Clearing the npm cache can resolve issues caused by corrupted cache files. This step ensures that npm fetches fresh copies of packages.

    bash
    npm cache clean --force
  2. 2

    Update npm to the latest version

    Using an outdated version of npm can lead to bugs that have been resolved in newer releases. Updating npm ensures you have the latest fixes and features.

    bash
    npm install -g npm@latest
  3. 3

    Remove node_modules and package-lock.json

    Deleting the node_modules folder and package-lock.json file ensures that all packages are reinstalled fresh, which can resolve version conflicts and corrupted installations.

    bash
    rm -rf node_modules package-lock.json
  4. 4

    Reinstall project dependencies

    After clearing the cache and removing existing packages, reinstalling dependencies will fetch the latest compatible versions as specified in package.json.

    bash
    npm install
  5. 5

    Check for global package conflicts

    Sometimes global packages can conflict with local project dependencies. Check for globally installed packages that may interfere with your project and consider uninstalling them if necessary.

    bash
    npm list -g --depth=0

Validation

To confirm the fix worked, run your npm commands again and ensure that the error does not reappear. Additionally, verify that all dependencies are installed correctly by checking the node_modules folder and running your application.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

npmpackage-managernodejsbug