Creating an NPM package module for ReactJS involves a few steps:

1. Initialize the package: To start, create a new directory for your package and run the npm init command to initialize the package. This will create a package.json file in the directory which holds metadata about the package.

2. Write the code: Next, write the ReactJS code for your package. Make sure to follow best practices and create a well-structured codebase that can be easily understood and used by others.

3. Set up the build process: You'll need to configure your package to build and compile the code so that it can be used in other projects. You can use tools like Babel and Webpack to set up the build process.

4. Publish the package: Once your package is ready, you can publish it to the NPM registry. Run the npm login command to log in to your NPM account, and then run npm publish to publish the package. Make sure to choose a unique and descriptive name for your package, and to follow best practices for versioning and documentation.

5. Use the package: Other developers can now use your package by installing it via npm install. Make sure to provide clear and detailed documentation on how to use your package, and to respond to any issues or feedback from users.

Expected exceptions

You may encounter the issue of This package has been marked as private To solve it you need to go to root folder of your project and change the value of private to false.

Further help

Feel free to ask any question, Thank you!!.