Environment Variable Generator

GenTools/Environment Variable Generator

Country Tools:

Developer

Generate .env templates for different frameworks and platforms. Perfect for project setup.

Framework Templates

Custom Variables

Options

Include comments Show placeholder values Generate random secrets

# Generated by GenTools.io
# Template: nextjs

# Public API URL
NEXT_PUBLIC_API_URL=http://localhost:3000/api
# Site URL
NEXT_PUBLIC_SITE_URL=http://localhost:3000
# Database connection string
DATABASE_URL=postgresql://user:password@localhost:5432/db
# NextAuth.js secret
NEXTAUTH_SECRET=oRMjQkS68mB45CJ3l2wl5RzDD3ty1r7Y
# NextAuth.js URL
NEXTAUTH_URL=http://localhost:3000

What is This Tool?

An environment variable generator creates .env files with properly formatted key-value pairs for application configuration. Generate .env templates with comments, generate secure random values for secrets, and create .env.example files for team sharing.

The .env convention (popularized by the twelve-factor app methodology) separates configuration from code. Libraries like dotenv load .env files into process.env at runtime. Proper .env management requires .env (local secrets, git-ignored), .env.example (template, committed), and .env.production (deployment config).

Common Use Cases

Project Setup

Generate initial .env files with all required variables for frameworks like Next.js, Vite, Django, Rails, and Laravel.

Secret Generation

Create cryptographically secure random values for JWT_SECRET, API_KEY, SESSION_SECRET, and other credential variables.

Team Onboarding

Generate .env.example files with descriptive comments so new team members can set up their environment quickly.

Multi-Environment Config

Create .env.development, .env.staging, and .env.production files with appropriate values for each environment.

Frequently Asked Questions

Should I commit .env files?

Never commit .env with real secrets. Commit .env.example (with placeholder values and comments) so team members know which variables are needed.

How are secrets generated?

Secrets use cryptographically secure random values (crypto.getRandomValues) in hex or base64 format at configurable lengths.

What is the .env format?

KEY=value pairs, one per line. Comments start with #. Values with spaces need quotes. No export prefix (that is shell syntax, not .env).