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Generating and locating npm-debug.log files

When a package fails to install or publish, the npm CLI will generate an npm-debug.log file. This log file can help you figure out what went wrong.

If you need to generate a npm-debug.log file, you can run one of these commands.

For installing packages:

npm install --timing

For publishing packages:

npm publish --timing

You can find the npm-debug.log file in your .npm directory. To find your .npm directory, use npm config get cache.

If you use a CI environment, your logs are likely located elsewhere. For example, in Travis CI, you can find them in the /home/travis/build directory.

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https://docs.npmjs.com/generating-and-locating-npm-debug.log-files