.env Validator

Validate dotenv format (key syntax / duplicates / quotes / whitespace)

.env content

1 errors

3 warnings

4 valid keys

Duplicate key (first defined at line 2)

DATABASE_URL=postgres://other # duplicate

Unclosed quote

API_KEY="sk-secret

Invalid key '1FOO' (must match [A-Za-z_][A-Za-z0-9_]*)

1FOO=invalid_key

Whitespace around key

FOO=whitespace

How to use

Paste or type your .env file contents into the text area.
Errors and warnings appear instantly: duplicate keys, keys starting with a digit, unmatched quotes, and lines with leading whitespace are flagged.
Each issue shows the line number, severity badge, message, and the raw offending line.
Fix issues in the editor and watch the error/warning counts drop to zero.

Having DATABASE_URL appear on two lines triggers an error "duplicate key" on the second occurrence.
A line like "1FOO=value" triggers an error because .env key names must start with a letter or underscore.

Verify outputs before using in production. No warranty — see Terms.