Did you observe nodejs project has several RC dotfiles like
.babelrc generated in a nodejs project?
In this tutorial, learn about the contents of npmrc with the below things
- npmrc file create
- how to add a registry and scope multiple registries
- npm config set, get the list
- npmrc auth token configuration
- npmrc file location in windows
- How to create an npm runtime configuration
- npmrc sample file example
- parsing RC file in nodejs
For example, We have different RC files in different applications
.npmrc .babelrc .netrc .vuerc .yarnrc
.npmrc is an npm runtime configuration file that contains the following things related to the nodejs project as well as the application.
This will be used by npm commands to run based on configured settings
- environment variables
- npm registry configuration
- auth configurations
normally you can pass command-line options to the npm command. This is a command level.
suppose you want to change the log level for the npm install command.
npm install primeng --loglevel silent
The same above command level options can be replaced by placing
loglevel in the
npmrc file as below
In the same way, we can configure different settings in this file .npmrc file can be created as
- OS user
- Application-level rc files are configuration settings for a module or a project in a Unix operating system.
you can list out the
npmrc file content using the below command
npm config list
you can update the
npmrc with the
npm config set command
npm config set author.name "John" npm config set author.email "[email protected]"
configuration settings can be retrieved with the
npm config get command
npm config get author. name npm config get author.email
.npmrc file can be configured to have
What is the .npmrc file location in Windows and MAC?
In Windows, Let’s see the path of the file location.
.npmrc file is created in windows for nodejs installation globally with below location
if you want settings such as logging need at the OS user level, you can find below the location
Another location for npmrc will be created while installation of nodejs setup.
you can also check npm location on any OS using the below command
npm config ls -l
How to create an npmrc file?
You can create npmrc files using the below approaches
- manually with any editor
- npm login command
.npmrc file content can be similar to the
ini file format
change loglevel for npm install command output
npm install command gives a lot of useful information to the console.
This can be controlled with loglevel settings via command line or npmrc loglevel settings
npm install lodash --loglevel silent
you can set the command to update the log level.
npm config set loglevel="silent"
This update the npmrc file with the below entries
There are other
loglevel settings like
npmrc environment variables
How to update proxy configuration in npmrc file?
npm config command has a set command to set the below values with proxy url addresses
- proxy details
npm config set http-proxy http://username:[email protected]:port npm config set https-proxy http://username:[email protected]:port npm config set proxy http://username:[email protected]:port
npmrc multiple registries
nodejs uses the default registry for npm packages to download dependencies.
you can create custom scope packages with the below command
npm config set @cloudhadoop: registry http://npm.cloudhadoop.com
You can create and configure multiple registries in the npmrc file
Here is a code for
npmrc multiple registry example
npmrc auth token
sometimes, We want to add auth token to authorize the registration of scope modules.
For example, font awesome comes with a free and licensed version.
the free version can be downloaded directly without auth token.
But for the licensed version, you need to supply auth token which is a secret key.
So you will not directly configure in npmrc file
first, create an environment variable for auth_token
Next run below command
authorization token will not be committed to a git repository.
You can also add in .env files if you are using env files in your project which are not committed to git due to this is added in .gitignore by default.
npmrc parser in nodejs
There are multiple libraries to parse RC files similarly to a JSON file,
npmrc sample file example
Let’s see a
sample npmrc file in the node project.
comments always started with
; that will be ignored by npm commands
# configure auth token @fontawesome:registry=https://npm.fontawesome.com/ //npm.fontawesome.com/:_authToken=$AUTH_TOKEN #Default registry registry=https://registry.npmjs.org/ #scoped registry @cloudhadoop:registry=http://npm.cloudhadoop.com ;log level settigns loglevel=warn
In this tutorial, You learned about npmrc files with examples in nodejs projects.