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About .env Key Extractor
The Dotenv (`.env`) Key Extractor & `.env.example` Template Generator extracts variable names from `.env` files, stripping out sensitive passwords and API keys to produce sanitized `.env.example` templates, TypeScript environment types, and documentation tables.
How to Use .env Key Extractor
Step 1
Paste your active `.env` file into the input pane.
Step 2
Select output mode (`.env.example`, TypeScript ProcessEnv, or Markdown table).
Step 3
Review the sanitized template.
Step 4
Click "Copy .env.example".
Practical Use Cases for .env Key Extractor
Generating Sanitized `.env.example` Files for Git
Extract all variable names from your production `.env` and replace secret values with empty placeholders or sample values to commit to GitHub.
Generating TypeScript `ProcessEnv` Type Definitions
Generate `declare namespace NodeJS { interface ProcessEnv { ... } }` declarations for full type safety across `process.env`.
Input & Output Examples
Generating `.env.example` Template
`DATABASE_URL=postgres://admin:secret@localhost:5432/prod\nJWT_SECRET=supersecret123\nPORT=8080`
`DATABASE_URL=\nJWT_SECRET=\nPORT=8080`
Key Features & Performance
- ✓Outputs: Clean `.env.example` template, TypeScript `ProcessEnv` interface, Markdown table, or JSON keys array.
- ✓Option to preserve non-secret defaults (e.g. `PORT=3000`, `NODE_ENV=development`) while stripping secrets.
- ✓Alphabetizes variable names for clean repository organization.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy `.env.example`.
Key Terminology & Definitions
`.env.example`
A sanitized template file committed to source repositories that lists all required environment variable keys with empty or dummy values.
`NodeJS.ProcessEnv`
The global TypeScript interface defining types for `process.env` properties in Node.js applications.