.env File Generator

Build a .env file from key/value rows, or a framework preset.

Build a properly-formatted .env file right in your browser — add environment variables one by one, or quick-add a whole preset for Node.js, Next.js, Vite, Django, Laravel, a database, AWS, Stripe, SMTP, Docker Compose, Supabase, Firebase or Vercel. Keys are auto-formatted to UPPER_SNAKE_CASE, values are quoted only when needed (or always, if you prefer), and you can add an export prefix for shell-sourceable files. Import an existing .env by pasting it in, then copy or download the result, plus a ready-to-copy .gitignore reminder and a full .env best-practices guide so your secrets never get committed. Runs fully in your browser — nothing you type is uploaded.

How to use .env File Generator

  1. Add your variables

    Type a key and value for each row — press Add variable for more, or use the trash icon to remove one.

  2. Or load a stack preset (optional)

    Pick a single framework or service like Node.js, Next.js, Laravel or Stripe from the dropdown to load exactly its common keys — picking a preset replaces the current rows, so two stacks are never mixed together.

  3. Choose your formatting

    Toggle quoting for all values, an export prefix for shell-sourceable files, or alphabetical sorting.

  4. Copy or download

    Copy the generated text or download it directly as a .env file, ready to drop into your project root.

  5. Protect it with .gitignore

    Copy the reminder snippet and add it to your .gitignore so your secrets are never committed to version control.

.env File Best Practices

Never commit your .env file

A .env file holds real secrets — API keys, database passwords, tokens. Add it to your .gitignore the moment you create it. Instead of committing the real file, commit a .env.example with the same keys but placeholder values, so teammates know exactly what to set up without ever seeing your secrets.

# .gitignore
.env
.env.local
.env.production
!.env.example

Know your environment-specific files

Most frameworks support more than one .env file so different environments can override each other:

Load order varies by framework. In Next.js: .env → .env.local → .env.[mode] → .env.[mode].local, with later files winning.

Respect your framework's prefix rules

Most frameworks only expose a variable to browser code when its key uses a specific prefix:

A variable without the right prefix simply comes back undefined in client code. That's not a bug — it's a safety net that stops server-only secrets from reaching the browser by accident.

Rotate secrets, don't just store them

Treat every credential in a .env file as temporary. Rotate API keys and passwords on a schedule, and immediately after anyone with access leaves the team. In production, manage secrets through your hosting platform's environment-variable settings (Vercel, Railway, Render, Fly.io) rather than uploading a file — update the value there, redeploy, confirm everything still works, then revoke the old credential.

Why not just hardcode these values in your code?

It's tempting to paste a database URL or API key straight into your code — but the moment you move from your laptop to a staging server or production, that value has to change, forcing you to edit code and redeploy just to update a setting. Environment variables fix this: the code stays exactly the same everywhere, and only the .env file changes between environments. (Developers call this idea "config in the environment" — it's the third rule of the well-known Twelve-Factor App guidelines, but the takeaway is simple: settings live in .env, not in your source files.)

A few security habits worth keeping

chmod 600 .env

Frequently asked questions

What is a .env file used for?

A .env file stores environment variables — API keys, database URLs, ports and secrets — outside your source code. Frameworks like Node.js (dotenv), Next.js, Django, Laravel and Vite load it automatically so the same code can run with different settings across development, staging and production.

Is it safe to generate my .env file online?

Yes. Everything in this generator runs entirely in your browser using plain JavaScript — no key, value or comment you type is ever sent to a server, logged or stored. You can safely fill in real secrets and copy or download the result.

Should I commit my .env file to Git?

No — never commit a real .env file. It typically holds secrets like API keys and database passwords. Add .env, .env.local and similar files to your .gitignore (this tool includes a ready-to-copy snippet) and instead commit a .env.example with placeholder values.

What naming convention should I use for keys?

The convention is UPPER_SNAKE_CASE — letters, numbers and underscores only, starting with a letter or underscore (e.g. DATABASE_URL, JWT_SECRET). This generator automatically converts whatever you type into that format.

When do I need to quote a value?

Values with spaces, #, quotes or an equals sign need quoting so parsers read them correctly — this tool adds quotes automatically for those, or you can force quoting on every value with the "Quote all values" toggle.

What does the export prefix option do?

Turning on "export" prefixes every line with export KEY=value, which makes the file directly sourceable in a Bash/Zsh shell (source .env) rather than only being read by a dotenv-style library.

Can I import an .env file I already have?

Yes. Click Import, paste the existing content, and it's parsed back into editable rows — including quoted values and preceding # comments — so you can tweak and regenerate it.

Related tools — Developer · Config file generators