How to test node modules before publishing it to npm registtry

Assume You are developing an npm module and you want to test it before publishing it to the npm registry. Npm provides a way to test your module locally before publishing it to the npm registry.
In this post, I will show you how to test npm modules before publishing it to npm registry

Let’s first create a module for converting string to title case.
Run the following command

npm init -y
touch index.js

After running the above command your folder structure will look like below

Open your project in VS Code and then edit the index.js file

module.exports=function(str){
    return str[0].toUpperCase()+str.slice(1);
}

How to test the module locally

To test the module locally we will use npm link the command which creates a symbolic link.
To create a link run the following command

cd titlecase
npm link

if the command run successfully you will see the following output

C:\Users\lenovo\AppData\Roaming\npm\node_modules\titlecase -> F:\blog\modules\titlecase

How to use

To use the above module in your main project. Follow the following steps

• Navigate to your main project

• Run the following command in the terminal (make sure you are inside the project)

   npm link titlecase
  
  

  if the command run successfully you will see the output as below

  F:\blog\modules\module-demo\node_modules\titlecase -> C:\Users\lenovo\AppData\Roaming\npm\node_modules\titlecase -> F:\blog\modules\titlecase
  
  

Now you can use the module as below

const titleCase=require('titlecase');
console.log(titleCase("hello"));