process env NODE ENV is undefined

Question

I m trying to follow a tutorial on NodeJs  I don t think I missed anything but whenever I call  the process env NODE ENV the only value I get back is undefined  According to my research the default value should be  development   How is this value dynamically set and where is it set initially

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In UBUNTU use     export NODE ENV test

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in package json we have to config like below  works in Linux and  Mac OS   the important thing is  export NODE ENV production  after your build commands below is an example      scripts           start    export NODE ENV production  amp  amp  npm run build  amp  amp  npm run start-server         dev    export NODE ENV dev  amp  amp  npm run build  amp  amp  npm run start-server           for dev environment  we have to hit   npm run dev  command for a production environment  we have to hit   npm run start  command

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You can also set it by code  for example    process env NODE ENV    test

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If you faced this probem in React  you need react-scripts 0 2 3 and higher  Also for other environment variables than NODE ENV to work in React  they need to be prefixed with REACT APP

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As early as possible in your application  require and configure dotenv  require  dotenv   config

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We ran into this problem when working with node on Windows   Rather than requiring anyone who attempts to run the app to set these variables  we provided a fallback within the application    var environment   process env NODE ENV     development     In a production environment  we would define it per the usual methods  SET export

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In macOS for those who are using the express version 4 x x and using the DOTENV plugin  need to use like this     After installing the plugin import like the following in the file where you init the application      require  dotenv   config  path  path resolve   dirname    env      In the root directory create a file   env  and add the varaiable like    NODE ENV development or  NODE ENV   development

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You can use the cross-env npm package  It will take care of trimming the environment variable  and will also make sure it works across different platforms   In the project root  run   npm install cross-env   Then in your package json  under scripts  add    start    cross-env NODE ENV dev node your-app-name js    Then in your terminal  at the project root  start your app by running   npm start   The environment variable will then be available in your app as process env NODE ENV  so you could do something like   if  process env NODE ENV      dev          Your dev-only logic goes here

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For me  the issue was that I was using the pkg library to turn my app into an executable binary  In that case  the accepted solutions didn t work  However  using the following code solved my problem  const NODE ENV     lt any gt process  pkg    production    process env NODE ENV   I found this solution here on GitHub

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process env is a reference to your environment  so you have to set the variable there   To set an environment variable in Windows   SET NODE ENV development   on OS X or Linux   export NODE ENV development

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tips  in package json      scripts        start    set NODE ENV dev  amp  amp  node app js       in app js   console log process env NODE ENV     dev console log process env NODE ENV      dev      false console log process env NODE ENV length     4  including a space at the end     so  this may better    start    set NODE ENV dev amp  amp  node app js    or  console log process env NODE ENV trim        dev      true

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It is due to OS  In your package json  make sure to have your scripts Where app js is your main js file to be executed  amp  NODE ENV is declared in a  env file  Eg    scripts          start    node app js        dev    nodemon server js        prod    NODE ENV production  amp  nodemon app js        For windows  Also set up your  env file variable having NODE ENV development  If your  env file is in a folder for eg config folder make sure to specify in app js your main js file   const dotenv   require  dotenv    dotenv config   path     config config env

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For people using  nix  Linux  OS X  etc    there s no reason to do it via a second export command  you can chain it as part of the invoking command   NODE ENV development node server js   Easier  no

[javascript] process.env.NODE_ENV is undefined

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