Is my .env file sent to a server?

No. All processing runs in your browser. Your environment variable keys, values, and secrets never leave your device — not even temporarily.

What .env format is supported?

The standard KEY=value format used by dotenv, Docker Compose, and most deployment platforms. Lines starting with # are treated as comments. Blank lines are preserved or stripped depending on your settings.

How does the formatter handle quoted values?

Quoted values (KEY="some value" or KEY='some value') are parsed correctly, preserving the quotes in the output. This is important for values that contain spaces, equals signs, or special characters.

Does it detect duplicate keys?

Yes. Duplicate keys are flagged as warnings in the analysis panel. In most dotenv implementations, the first definition wins, so later duplicates are silently ignored — a common source of bugs.

What is a .env.example file and how do I generate one?

A .env.example file lists all required keys with empty or placeholder values, checked into version control. Use the "Strip values" mode to produce a .env.example from your real .env.

Should I commit .env files to Git?

No. Add .env to your .gitignore and commit only .env.example. Real .env files contain secrets. Use a secrets manager (AWS Secrets Manager, HashiCorp Vault, Doppler) for production.

Does sorting break anything?

Alphabetical sorting is safe for most applications. dotenv load order only matters if you have variable interpolation (KEY2=$KEY1) — in that case, KEY1 must appear before KEY2.

What is variable expansion in .env files?

Some dotenv libraries support variable interpolation: DB_URL=postgres://$DB_USER:$DB_PASS@$DB_HOST/mydb. The formatter shows interpolated references in the analysis panel so you can verify the correct load order.

.env File Formatter & Validator

Paste a .env file to validate its format, detect duplicate keys, sort alphabetically, and optionally strip values to produce a .env.example. Runs entirely in your browser.

100% client-side · your secrets never leave your device

Sort alphabetically Strip comments Strip values (generate .env.example)

tool.dotenv-format.label-input-.env

tool.dotenv-format.label-output

How to format a .env file

Paste your .env file content into the input panel.
Toggle options: sort alphabetically, strip comments, or strip values.
The formatted output and analysis appear automatically.
Click Copy and paste the result into your file.

Common use cases

Generate .env.example: Enable "Strip values" to produce a template safe for version control.
Find duplicate keys: Check the analysis panel to detect silently-ignored keys.
Standardise format: Sort and clean .env files before sharing with teammates.
Audit variables: Count declared variables and spot empty values before deploying.

常見問題

Is my .env file sent to a server?: No. All processing runs in your browser. Your environment variable keys, values, and secrets never leave your device — not even temporarily.
What .env format is supported?: The standard KEY=value format used by dotenv, Docker Compose, and most deployment platforms. Lines starting with # are treated as comments. Blank lines are preserved or stripped depending on your settings.
How does the formatter handle quoted values?: Quoted values (KEY="some value" or KEY='some value') are parsed correctly, preserving the quotes in the output. This is important for values that contain spaces, equals signs, or special characters.
Does it detect duplicate keys?: Yes. Duplicate keys are flagged as warnings in the analysis panel. In most dotenv implementations, the first definition wins, so later duplicates are silently ignored — a common source of bugs.
What is a .env.example file and how do I generate one?: A .env.example file lists all required keys with empty or placeholder values, checked into version control. Use the "Strip values" mode to produce a .env.example from your real .env.
Should I commit .env files to Git?: No. Add .env to your .gitignore and commit only .env.example. Real .env files contain secrets. Use a secrets manager (AWS Secrets Manager, HashiCorp Vault, Doppler) for production.
Does sorting break anything?: Alphabetical sorting is safe for most applications. dotenv load order only matters if you have variable interpolation (KEY2=$KEY1) — in that case, KEY1 must appear before KEY2.
What is variable expansion in .env files?: Some dotenv libraries support variable interpolation: DB_URL=postgres://$DB_USER:$DB_PASS@$DB_HOST/mydb. The formatter shows interpolated references in the analysis panel so you can verify the correct load order.

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