.env Syntax Validator

Validate environment variable syntax and detect credentials leaks locally.

.env Syntax & Leak Validator

Paste .env Contents0 Active Lines

Security Credentials Audit

No Critical Plaintext Leaks FoundNo patterns matching OpenAI credentials, GCloud keys, or raw SQL/Mongo passwords were found containing non-placeholder values.

Syntax & Linter Checks

Dotenv Syntax ValidNo unclosed quotes, duplicate key bindings, or critical spaces around variable declarations were detected.

How to Use

Paste .env File

Input your config settings lines into the secure editor.

Lint Configuration

The parser highlights line-by-line syntax mistakes and duplicates.

Review Leak Alerts

Confirm that no private keys, database links, or secret keys are exposed.

Real-World Examples & Use Cases

Pre-Commit Code Audits

Before staging and committing changes to Git repositories, developers paste their `.env` profiles to ensure they haven't accidentally left real, production database passwords, AWS secrets, or private certificates in key-value lines.

CI/CD Configuration Audits

Systems administrators managing deployment pipelines use this linter to verify that environment config sheets copied from servers are syntactically valid and contain no overlapping duplicate keys.

Multi-Environment Config Alignments

When maintaining separate configurations (e.g., `.env.development` vs `.env.production`), teams paste files side-by-side to highlight keys that have formatting inconsistencies or syntax mistakes.

How It Works

Environment Configuration Linting and Secrets Matching Logic: The validator parses input strings line-by-line using standard POSIX environment variable definitions: 1. Lexical Parsing: Strips whitespace, identifies comments (starting with `#`), and separates keys and values by splitting at the first unescaped equal sign (`=`). 2. Syntax Error Checks: Toggles warning flags if: - Keys contain invalid characters (only alphanumeric and underscores are permitted). - Spaces exist directly around the equal sign (e.g., `KEY = value`, which fails in standard shell/dotenv environments). - Unclosed quote strings exist around values. 3. Duplicate Key Indexing: Maintains a map of processed keys. If a key is encountered twice, it flags a warning for redundant declarations. 4. Regex Entropy & Secret Matching: Scans values against known high-entropy signature patterns (such as AWS keys starting with `AKIA`, Stripe tokens starting with `sk_live`, Private RSA blocks starting with `-----BEGIN RSA PRIVATE KEY-----`, and generic password indicators containing mixed alphanumeric strings with terms like `db_pass`).

Frequently Asked Questions

Why shouldn't I commit my .env file to Git?▼

Your `.env` file contains sensitive local credentials, secret keys, database links, and API tokens. Committing this file to Git repositories (especially public platforms like GitHub) exposes your secrets to crawlers, allowing malicious scripts to exploit your databases or cloud resources within minutes.

Are spaces allowed around the equal sign in .env files?▼

In general, standard bash/shell parsers and many dotenv libraries do not support spaces around the equal sign (e.g., `API_KEY = "value"` will cause a parsing error). It is best practice to format entries as `KEY=value` with zero spaces around the `=`. Our validator flags these occurrences as warnings.

How do I handle multi-line values in environment variables?▼

To use values that span multiple lines (like private certificates or keys), you must wrap the value in double quotes (`KEY="line1\nline2"`) or use actual literal newlines inside double quotes. The validator checks if quotes match and remain closed.

Is my config data sent to a server for leak checks?▼

Absolutely not. Many security tools scan your configurations on remote servers, which is a major security risk. ConvertWithMi's parser operates entirely inside your local browser's JavaScript sandbox. Your keys and configs never leave your device.

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