NPM - No license field

Add this to your package.json:

{
    "license" : "MIT license" 
}

If your software is opensource.

You can have some examples to use on: https://opensource.org/licenses

Add a license attribute in your package.json file, e.g:

{ 
  "name": "...."
  ...
  "license" : "SEE LICENSE IN <filename>" 
}

If you are working on an open source package with an OSI-approved license, use it's identifier from this list as value for the license attribute.

Here is the specification of the package.json format: https://docs.npmjs.com/files/package.json

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