env-check

A developer tool for quickly validating API keys across multiple popular services. Stop wondering if your API keys are working - just paste and check!

Live: https://envcheck.vercel.app

Features

• 🔑 Instant API key validation across AI, cloud, database, payment, messaging and analytics services
• 🚀 Clean, modern interface built with Next.js
• 🔒 Validation runs in Next.js Server Actions - keys go only to the service being checked, and nothing is stored
• 🛡️ Nonce-based CSP plus HSTS and anti-framing headers out of the box
• 🌙 Dark/Light mode support
• 🌍 i18n support (English/Vietnamese)

Quick Start

Prerequisites: mise (provides the pinned Node and pnpm — versions live in mise.toml) and Git.

# Install the toolchain (Node + pnpm) from mise.toml
mise install

# Install dependencies
pnpm install

# Start development server
pnpm dev

# Open http://localhost:3000

Docker

# Run using the pre-built image
docker run -d \
  --name env-check \
  -p 3000:3000 \
  holedev/env-check

# Access the application at http://localhost:3000

You can also stop and remove the container:

# Stop the container
docker stop env-check

# Remove the container
docker rm env-check

Vercel Deployment

You can deploy this application to Vercel with a single click:

Set NEXT_PUBLIC_SITE_URL (e.g. https://your-domain.com) on your own deployment so canonical URLs, Open Graph tags and sitemap.xml point at your domain instead of https://envcheck.vercel.app.

Environment variables

Variable	Default	Purpose
NEXT_PUBLIC_SITE_URL	https://envcheck.vercel.app	Public origin for canonical URLs, Open Graph and sitemap.xml.
ALLOW_PRIVATE_NETWORK	unset	Tools that connect to a host you type (PostgreSQL, MongoDB, MySQL, Redis, SMTP, S3 endpoint, Supabase project URL) refuse loopback, private and link-local addresses so the server can't be used to probe its own network. Set to true on a self-hosted instance that needs to check services on your LAN.

Development

This project uses:

• Next.js with TypeScript
• Tailwind CSS for styling
• Biome for formatting and linting
• Conventional commits with Husky hooks

Available commands:

pnpm dev         # Start development server
pnpm build       # Build for production
pnpm test        # Run tests
pnpm lint:fix    # Run Biome formatter and linter

Contributing

We welcome contributions! Please read our contributing guidelines before submitting a pull request.

License

GNU GPLv3