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Environment Variable Generator

Generate .env files from Docker Compose, Kubernetes configs, or framework presets. Create documented environment variable templates instantly.

Environment Variable Generator

Select a framework preset, paste a Docker Compose or Kubernetes YAML,
or define custom variables to generate your .env file.

Already have a .env file?Validate it →

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

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.

How to Use Environment Variable Generator

  1. 1

    Generate .env from Docker Compose services

    Paste docker-compose.yml. Generator extracts environment variables defined in 'environment' sections. Creates .env file with all service env vars. Useful for local development setup.

  2. 2

    Generate .env from Kubernetes ConfigMap/Secrets

    Paste Kubernetes YAML with ConfigMap or Secret resources. Generator extracts key-value pairs, converts to .env format. Align local dev config with K8s production.

  3. 3

    Generate .env from GitHub Actions secrets

    If you have CI/CD secrets defined in GitHub Actions, generator can convert them to .env template (with placeholders). Ensures local dev uses same variable names as CI.

  4. 4

    Generate .env from Heroku or environment export

    Export Heroku config with heroku config:get > heroku.env. Paste into generator. Converts Heroku KEY=value format to standard .env. Migrate deployments locally.

  5. 5

    Generate .env with comments and validation hints

    Generator can add comments (# Purpose of this var) and type hints (# type:string, # required). Resulting .env is self-documenting, onboards new devs faster. Good for team repos.

Frequently Asked Questions

What is the Environment Variable Generator?
It generates properly structured .env files from Docker Compose files, Kubernetes configs, framework presets, or custom schemas — complete with section comments, type annotations, and sensible defaults.
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.