.env File Editor
Edit and validate .env files — detect duplicate keys, empty values, and unsafe characters
About this tool
.env File Editor parses environment variable files and validates them
for common issues: duplicate keys that silently overwrite each other, keys with empty
values that may break configuration, and keys containing characters outside the safe
[A-Za-z0-9_] range. It reads standard KEY=VALUE pairs,
quoted values, export-prefixed lines, comments, and blank lines.
Examples:
-
Paste a .env with a duplicated
DATABASE_URL→ the tool flags both lines and shows which value would win. - Click Export .env.example to strip all values and produce a template with just the keys — ready to commit to version control.
FAQ
What counts as a duplicate key? ›
Any key that appears more than once after trimming whitespace. The tool flags every occurrence after the first so you can decide which value to keep or whether to merge them.
What are "unsafe" characters in a key? ›
By convention, .env keys should use only letters, digits, and underscores (<code>[A-Za-z0-9_]</code>). Dashes, dots, spaces, or special characters may work in some environments but cause issues in others — the tool warns about them.
Does it handle quoted values? ›
Yes. Single-quoted, double-quoted, and unquoted values are all supported. Quoted values may contain spaces, equals signs, and special characters.
What does "Export .env.example" do? ›
It generates a template file — all the original keys with empty values — that you can safely commit to version control so teammates know which environment variables are needed without exposing secrets.