Environment variables validator

env_validator.js

const env = (key) => process.env[key] || null

const debug = (obj) => console.dir(obj, { colors: true })

const validator = (vlist = []) => {
  const errors = []

  vlist.forEach(v => {
    if (!env(v)) errors.push(`No '${v}' supplied!`, v)
  })

  return {
    valid: () => !!!errors.length,
    errors: () => {
      console.log('ERRORS:')
      errors.forEach(error => console.log(` - ${error}`))
      process.exit(1)
    }
  }
}

module.exports = {
  env,
  debug,
  validator
}

Usage:

const { validator } = require('./env_validator');

// My validation list
const vlist = [
  'DB_HOST',
  'DB_NAME',
  'DB_USER',
  'DB_PASSWD'
]

const v = validator(vlist)

if (v.valid())
  // ok, continue...
else
  // display errors!
  v.errors()