What counts as an "invalid" variable name?

Names that don't follow standard environment variable conventions — typically must start with a letter or underscore and contain only letters, numbers and underscores.

Does it check if referenced variables are actually used in my code?

No, it validates the .env file's own structure (duplicates, missing values, invalid names) — it doesn't cross-reference against your codebase.

Is my .env file uploaded anywhere when I check it?

No, parsing happens locally in your browser — sensitive values in your .env file aren't sent anywhere.

Does .env File Parser/Validator upload my files to a server?

No. .env File Parser/Validator runs entirely in your browser using on-device processing, your files never leave your device.

.env File Parser/Validator

Parse a .env file and flag duplicate keys, missing values and invalid names.

Runs in your browser

.env content

About this tool

.env files are easy to silently break — a duplicate key that overwrites an earlier value, a missing value, an invalid variable name — and none of these mistakes show an error until whatever depends on that environment variable fails at runtime. This tool parses a .env file and flags duplicate keys, missing values and invalid names, catching configuration mistakes before they cause a confusing runtime failure.

Frequently asked questions

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