.env File Generator

Hand-writing a .env file by hand is exactly where configuration bugs are born: a missing quote around a value with spaces, a # swallowed mid-value, an export missing when the shell needs it, a duplicate key silently overriding the first. The .env File Generator removes all of that friction. You type plain KEY=value lines — the same format everyone already thinks in — and it produces a correctly quoted, consistently formatted .env file ready to drop into Node.js (dotenv), Docker Compose, Next.js, or any environment that reads dotenv-style configuration.

The generator handles the edge cases automatically: values that contain spaces get double quotes, embedded # or = characters no longer break parsing, existing comments and blank lines are preserved, and keys can be normalized to uppercase or sorted A-Z. Need a shell-friendly variant? Toggle export prefixes. Need the same config as structured data? Switch to JSON output. Duplicate keys and malformed lines are flagged with their line numbers instead of silently corrupting your file.

• KEY=value input: Paste or type pairs, one per line — no config syntax to learn.
• Smart quoting: Values with spaces, # or = are quoted automatically; control it with auto / always / never.
• Comments & blanks preserved: # lines and empty lines survive generation untouched, in order.
• Line-level validation: Missing separators, invalid keys and duplicates are reported with their exact line numbers.
• Uppercase keys & A-Z sort: Normalize a messy list into a consistent file in one click.
• Shell mode: Prefix every variable with export for sourcing directly in bash.
• JSON export: The same pairs as a structured object for CI, templating and config tools.
• Copy & download: One click to the clipboard or a real .env file.
• Fully private: Everything runs in your browser; values never leave the page.

1. Paste or type your pairs. One KEY=value per line. Lines starting with # are comments and empty lines are preserved.
2. Load the sample (or use the Clear button to start from scratch) to see a realistic configuration in one click.
3. Tune the options. Pick the output format (.env, shell export or JSON), choose the quoting behaviour, and toggle uppercase keys, sorting or the export prefix.
4. Generate. The result appears instantly. Malformed lines and duplicates are flagged with their line numbers.
5. Review, copy or download. Save as .env in your project root and let your framework load it.

Example 1 — Node.js + dotenv. You are setting up a new Express API and need database, JWT and port configuration. Paste PORT=3000, DATABASE_URL=postgresql://user:pass@localhost:5432/app and a JWT secret, generate, and save as .env in the project root — require('dotenv').config() picks it up immediately.

Example 2 — Docker Compose. Compose loads service configuration through env_file. Generate a .env with POSTGRES_USER, POSTGRES_PASSWORD and POSTGRES_DB, then reference it in your compose file. Because the generator quotes values with spaces, passwords and connection strings parse correctly every time.

Example 3 — Frontend build variables. Next.js and Vite only expose variables prefixed with NEXT_PUBLIC_ or VITE_. Type your public keys and endpoints, toggle uppercase keys and sorting, and generate a clean .env.local with every variable consistently formatted.

Example 4 — CI/CD pipeline. A GitHub Actions workflow needs the same variables as your local setup. Generate a shell-export version (export API_KEY=...) and paste it into the workflow's env: block, or keep the JSON output to feed templating and secret-manager tools.

Example 5 — Cleaning a legacy file. You inherited a hand-edited .env with mixed-case keys, stray spaces and duplicated entries. Paste it in, enable uppercase + sort, and the generator rewrites a clean, deduplicated, consistently quoted file — pointing out any malformed lines along the way.

• Stop guessing quoting: spaces, # and = inside values are handled automatically.
• Consistent output: the same style every time — no more mixed-case, mis-quoted files.
• Errors point at the problem: every malformed or duplicate line is flagged with its number.
• One source, three formats: .env, shell exports or JSON from the same pairs.
• Instant start: the load-sample button demonstrates the whole flow in one click.
• Private: no upload, no account, no server — your secrets stay local.