Is it safe to paste API keys?

Yes. All processing runs locally in your browser. No data is ever transmitted to a server.

Are quoted values supported?

Yes. Single and double-quoted values (e.g. SECRET="my value") are parsed correctly.

Does it work for .env.local or .env.production?

Yes. Any file following the same KEY=VALUE format is supported.

Are multi-line values supported?

No. This tool validates single-line KEY=VALUE entries. Multi-line heredoc values are not supported.

⚙️

env validator,

.env Validator

Validate .env syntax, detect duplicate keys, and view all variables in a table.
Safe for API keys — all processing is browser-local.

✅

Syntax Check

Invalid lines and spacing errors

🔍

Duplicate Detection

Find duplicate environment variable names

📋

Variable Table

Clean key-value display with masking

Paste .env content here

Analysis Results

🔒Content is processed only in your browser. API keys and secrets are never transmitted.

about,

About

A free tool to validate and analyze .env files for syntax errors, duplicate keys, and variable definitions — all in your browser. Supports Node.js dotenv conventions and Docker Compose env_file format.

Sensitive values like API keys are automatically masked in the variable table. No data ever leaves your device.

how to use,

How to Use

STEP 1

Paste .env Content

Paste your .env file content into the left text area.

STEP 2

Real-Time Analysis

Syntax errors, duplicate keys, and variable list update instantly.

STEP 3

Fix Errors

Review flagged lines and fix them in your .env file.

glossary,

Glossary

.env File: A text file defining environment variables in KEY=VALUE format. Typically git-ignored and not committed to repositories.
Environment Variable: OS-level variables that applications read at runtime for configuration (DB credentials, API keys, feature flags, etc.).
12-Factor App: A methodology for building SaaS apps. Factor III states configuration should be stored in environment variables.
dotenv: A Node.js library that reads a .env file and injects the variables into process.env.
Secret Management: Best practices for securing API keys and credentials. Production environments should use AWS Secrets Manager, Vault, etc.
Comment Line: In .env files, lines starting with # are comments and are ignored by the parser.

faq,

FAQ

Q.Is it safe to paste API keys?: Yes. All processing runs locally in your browser. No data is ever transmitted to a server.
Q.Are quoted values supported?: Yes. Single and double-quoted values (e.g. SECRET="my value") are parsed correctly.
Q.Does it work for .env.local or .env.production?: Yes. Any file following the same KEY=VALUE format is supported.
Q.Are multi-line values supported?: No. This tool validates single-line KEY=VALUE entries. Multi-line heredoc values are not supported.