Loads parameters from the AWS parameter store . Binds the final hierarchy level in the provided name to a corresponding environment variable.

loadParamStore.js

const AWS = require('aws-sdk')

require('dotenv').config()

AWS.config.update({ region: 'us-east-1' });
const ssm = new AWS.SSM()

const params = [
  '/WebApp/ead/NodeJS/CampusMap/MONGODB_URI',
  '/WebApp/ead/NodeJS/CampusMap/S3_BUCKET'
]

console.log('Loading parameter store...')
loadParameters(params).then(() => {
  console.log('Parameter store loaded.')
})

function loadParameters (params) {
  const query = {
    'Names': params,
    'WithDecryption': true
  }
  
  return ssm.getParameters(query, (error, data) => {
    if (error) throw new Error(error)

    data.Parameters.forEach(param => {
      const nameSections = param.Name.split('/')
      const name = nameSections[nameSections.length - 1]

      if (!process.env[name]) process.env[name] = param.Value
    })
  }).promise()
}