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Find the environment variables of a nodejs process in linux

If you have an active nodejs process running on your system, the easiest way to check what environment variables it is using can be done in 2 simple steps.

  1. Identify the process id of your nodejs app
pe -ef | grep node
  1. Use the PID you found in the above step in the following command
sudo cat /proc/PID/environ | tr \0 \n
The above command spits out a large bunch of key-valye pairs. You can always grep it for the variables you are interested in. e.g. 
sudo cat /proc/PID/environ | tr \0 \n | grep NODE_ENV
To check the environment variables from within the code itself, simply log the value of the variable process.env anywhere in your code.

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  5. Unit test your Nodejs RESTful API using mocha