rmtsrc / get-missing-env-vars

Returns an array of missing environment variables

Get Missing Environment Variables

Returns an array of missing environment variables.

Can be used to check that your application has the right environment variables set before runtime errors occur.

Usage

npm install --save get-missing-env-vars

Configuration takes an object of arrays:

• * which checks that the environment variables are set on all environments
• YOUR_ENV which will only check that the environment variables are missing when your application has NODE_ENV set to YOUR_ENV
• !YOUR_ENV which will only check that the environment variables are missing when your application does not have NODE_ENV set to YOUR_ENV

Example use case:

const getMissingEnvVars = require('get-missing-env-vars');

const requiredEnvConfig = {
  '*': ['NODE_ENV', 'PORT', 'HOST', 'API_URL'],
  'development': ['DEBUG_PATH']
  '!development': ['NODE_HTTP_USER', 'NODE_HTTP_PASS']
};

const missingEnvVars = getMissingEnvVars(requiredEnvConfig);
if (missingEnvVars.length > 0) {
  throw new Error(`The following required environment variables are missing and need to be set before starting the app: ${missingEnvVars.join(', ')}`);
}