.env File Generator
Build `.env` and `.env.example` files live, with framework presets, prefix grouping, validation, and sensitive-value masking.
About this ToolHow it works, benefits & use casesTap to collapse
Compose a .env file row by row — name, value, and an optional comment per variable — and watch a clean, valid file build live. Toggle the output between ".env (real values)" and ".env.example (masked)": example mode automatically replaces sensitive values with placeholders, detecting secrets by key patterns like secret, password, token, key, auth, and credential, while public variables keep meaningful sample values. Four framework presets (Next.js, React, Node.js, Express) drop in a sensible starter set, and the editor parses them back into editable rows. Optional flags let you group related variables under prefix headers (DATABASE_, API_, NEXT_PUBLIC_, and more) and inject auto-generated descriptions as comments. A live stats strip counts your variables and how many are sensitive, validation flags duplicate keys and warns when NODE_ENV is missing, and a best-practices panel reminds you to gitignore .env and commit only the masked example.
How to Use
- 1Click a framework preset (Next.js, React, Node.js, or Express) to load a starter set, or "Load example" / "Add variable" to start from scratch.
- 2Edit each row's Name, Value, and optional Comment; remove rows with the trash button.
- 3Choose the Output mode: ".env" for real values, or ".env.example" to mask sensitive ones automatically.
- 4Optionally enable "Group by prefix" to add prefix headers and "Add descriptions" to inject auto comments.
- 5Review the variable and sensitive counts plus any validation warnings, then copy or download the generated file.
Key Benefits
- Generate both .env and a masked .env.example from the same set of rows
- Automatic secret detection by key pattern (secret, password, token, key, auth, credential, and more)
- Framework presets for Next.js, React, Node.js, and Express
- Optional prefix grouping with section headers (DATABASE_, API_, NEXT_PUBLIC_, etc.)
- Optional auto-generated descriptive comments per variable
- Validation for duplicate keys and a reminder when NODE_ENV is absent
- Live counts of total and sensitive variables; config persists locally
Common Use Cases
- Producing a committable .env.example with every secret safely masked
- Bootstrapping environment config for a new Next.js or Express project from a preset
- Documenting required environment variables with grouped sections and descriptions
- Catching duplicate variable names before they cause hard-to-spot config bugs
- Standardising the .env layout across a team by sharing a consistent generated file
Framework presets
Variables
Sensitive variables without values: API_KEY
Live preview
NODE_ENV=development # Server port PORT=3000 # PostgreSQL connection string DATABASE_URL= # Third-party API key API_KEY=
Best practices
- Always add
.envto.gitignore - Commit
.env.example(sensitive values masked) — never.env - Group related variables with prefixes; document required vs. optional
- Use a secrets manager (Vault, AWS Secrets Manager) in production
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The ".env" mode writes your literal values, suitable for local use and gitignoring. The ".env.example" mode keeps non-sensitive values but replaces detected secrets with placeholders like your_secret_here, producing the safe-to-commit template other developers copy and fill in.
It matches the variable name (case-insensitively) against patterns including secret, password, pwd, token, key, api_key, auth, credential, private, passphrase, salt, and hash. Matching variables are counted as sensitive and get masked in .env.example mode; the stats strip shows the sensitive count.