After executing with typescript latest version: npm install --save @types/node you can use process.env directly. console.log(process.env["NODE_ENV"]) you will see the expected result if you have set NODE_ENV. ------------------------------------------------------ import dotenv from 'dotenv'; dotenv.config(); export const YOUR_ATTRIBUTE = process.env.YOUR_ATTRIBUTE!;declare namespace NodeJS { export interface ProcessEnv { HOST: string; DB_URL: string; DB_NAME?: string; }}