Environment Variable Generator

Generate .env, .env.example and Markdown docs from Docker Compose files, Kubernetes manifests, a custom list or presets for eight frameworks.

Select framework

13 variables ready

13 vars

# --- App ---
# Public app URL
NEXT_PUBLIC_APP_URL=http://localhost:3000
# API base URL
NEXT_PUBLIC_API_URL=http://localhost:3000/api

# --- Auth ---
# NextAuth.js URL
NEXTAUTH_URL=http://localhost:3000
# NextAuth.js secret
NEXTAUTH_SECRET=change-me-to-a-random-string

# --- Database ---
# Database connection string (Prisma)
DATABASE_URL=postgres://user:password@localhost:5432/mydb
# Direct database URL for migrations
DIRECT_URL=postgres://user:password@localhost:5432/mydb

# --- Payments ---
# Stripe publishable key
NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_...
# Stripe secret key
STRIPE_SECRET_KEY=sk_test_...
# Stripe webhook secret
STRIPE_WEBHOOK_SECRET=whsec_...

# --- Analytics ---
# Google Analytics measurement ID
NEXT_PUBLIC_GA_ID=G-XXXXXXXXXX
# PostHog project API key
NEXT_PUBLIC_POSTHOG_KEY=

# --- Email ---
# Resend API key for emails
RESEND_API_KEY=re_...

# --- Storage ---
# UploadThing secret key
UPLOADTHING_SECRET=sk_live_...

Already have a .env file?Validate it →

Updated October 2, 2026. Provided as is. Check the output before you rely on it in production.

How to use Environment Variable Generator

1

Generate .env from Docker Compose

Paste docker-compose.yml. Environment variables, ${VAR} references and map-style entries are extracted into a .env grouped by service.
2

Generate .env from Kubernetes YAML

Paste ConfigMap or Secret manifests to turn their keys into .env entries that match production.
3

Start from a framework preset

Pick Node.js/Express, Next.js, Django, Laravel, Rails, Spring Boot, FastAPI or Flask to get the common variables with sensible defaults.
4

Define custom variables

Add variables with a type (string, number, boolean, url, path or secret), a required flag and a description.
5

Copy or download

Copy or download the .env, then fill in real values. Validate it later with ENV File Validator.

Questions and answers

What is the Environment Variable Generator?

An environment variable template is a .env file that lists every variable an app needs, with comments and safe defaults instead of real secrets. This generator builds one from eight framework presets, a docker-compose.yml, Kubernetes manifests or your own list, as .env, .env.example or Markdown docs.

How do I generate a .env file from Docker Compose?

Switch to the Docker Compose tab and paste your docker-compose.yml. The tool extracts all environment variables, interpolation references (${VAR} syntax), and map-style entries into a ready-to-use .env file grouped by service.

Is this tool free and does it store my data?

Free to use with no signup. Processing happens directly in your browser — your Docker Compose, Kubernetes YAML, and generated .env files never leave your device.

What's the difference between this and the ENV File Validator?

The Generator creates new .env files from configs and templates. The Validator checks existing .env files against .env.example templates for missing or invalid variables. Use them together: generate first, validate later.

Which frameworks are supported?

Built-in presets for Node.js/Express, Next.js, Django, Laravel, Ruby on Rails, Spring Boot, FastAPI, and Flask — each with 10-18 common environment variables with realistic defaults. You can also define custom variable schemas.

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/env-generator/

For automation planning, fetch the canonical contract at /api/tool/env-generator.json.

Environment Variable Generator