Use ENV variables

Any config value in either nightwatch.conf.js or nightwatch.json can be specified as the name of an environment variables. Nightwatch will automatically populate the value, if found, from process.env.

Dotenv files are also supported and will be used if an .env file is found in the current working directory.

Here's an example from the generated nightwatch.conf.js:

nightwatch.conf.js 
module.exports = {
  src_folders: [],
  

  test_settings: {
    default: {
      launch_url: 'https://nightwatchjs.org'
    },
    

    browserstack: {
      webdriver: {
        start_process: false
      },
      

      selenium: {
        host: 'hub-cloud.browserstack.com',
        port: 443
      },
      

      desiredCapabilities: {
         browserName: 'chrome',
        'bstack:options' : {
          userName: '${BROWSERSTACK_USERNAME}',
          accessKey: '${BROWSERSTACK_ACCESS_KEY}',
        }
      }
    }
  }
}

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