firekeys

I got tired of copying and pasting Firebase config into my Next.js apps, so I made this small CLI. It turns your Firebase config (and service account keys) into .env format automatically.

Next.js is the supported target (e.g. NEXT_PUBLIC_FIREBASE_* for client config). If you want support for other frameworks or platforms, open an issue and we can add it.

It handles both:

• Client config — the firebaseConfig object from the Firebase console → .env with NEXT_PUBLIC_ vars
• Service account keys — your admin SDK JSON → FIREBASE_PROJECT_ID, FIREBASE_CLIENT_EMAIL, FIREBASE_PRIVATE_KEY

Installation

npm install -g firekeys
# or
npx firekeys

Usage

Client SDK config (JavaScript)

# From argument (use single quotes so inner " work)
firekeys 'const firebaseConfig = { apiKey: "AIza...", authDomain: "...", projectId: "...", storageBucket: "...", messagingSenderId: "...", appId: "1:..." };'

# From file
firekeys config.js

# From stdin (paste then Ctrl+D)
firekeys

# Custom output file
firekeys config.js -o .env.local

Admin SDK config (JSON)

firekeys admin-key.json --pp
cat admin-key.json | firekeys --pp

Output format

Client: NEXT_PUBLIC_FIREBASE_API_KEY, NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN, etc.

Admin: FIREBASE_PROJECT_ID, FIREBASE_CLIENT_EMAIL, FIREBASE_PRIVATE_KEY

Publishing to npm

cd firebasekeys-node
npm login
npm publish

After publish, users install with: npm install -g firekeys