env-check

A lightweight Node.js/TypeScript package to validate environment variables at runtime.

Features

• ✅ Check required environment variables at startup
• ✅ Zero dependencies → super lightweight
• ✅ TypeScript-first with full typings
• ✅ Works with Node.js, NestJS, Express, Next.js, etc.

Installation

npm install @jaynil001/env-check

or with yarn:

yarn add @jaynil001/env-check

Usage

1. Import

import { checkEnv } from "@jaynil001/env-check";

2. validate required env variables

checkEnv(["DB_HOST", "DB_USER", "DB_PASS"]);

• if missing

❌ Missing required environment variables: DB_PASS

• if all present

✅ All required environment variables are set!

Example Use Case

Suppose you have a .env file like:

DB_HOST=localhost
DB_USER=admin
DB_PASS=secret

You can validate these variables at the start of your application:

import { checkEnv } from "@jaynil001/env-check";

checkEnv(["DB_HOST", "DB_USER", "DB_PASS"]);

If any variable is missing, the process will exit with an error message.
If all are present, your app continues to run as expected.