.env Formatter & Validator
Format, validate, and check .env files for duplicates and syntax issues. All processing in your browser.
Try it with this example
Paste a .env file. Check for duplicate keys and invalid names. Format and validate.
What is this tool?
Environment files (.env) store configuration as KEY=VALUE lines. They can become messy: duplicate keys, invalid names, inconsistent formatting. The .env Formatter validates and formats .env content. Paste your file, and the tool checks for duplicate keys, invalid key names (must use letters, digits, underscore), and syntax issues. Optionally reformat for consistent style. All processing runs in your browser. Your secrets never leave your device.
Valid .env keys typically match [A-Za-z_][A-Za-z0-9_]*. Values can be quoted or unquoted; special characters often need quotes. The formatter flags problems: duplicate keys (which value wins?), keys with hyphens or spaces (often invalid), and malformed lines. Formatting may align equals signs, sort keys, or normalize quoting. The goal is a clean, valid .env that your application can load without errors.
Use it when inheriting a messy .env from a project. When debugging "why isn't this variable loading?"—often a typo or duplicate. When preparing a template .env for documentation (with placeholder values). Before committing .env.example, validate it. The tool doesn't execute or load the file; it only parses and reports. For actual secret handling, use proper secret management; for format and validation, this tool helps.
All processing is client-side. No upload, no storage. Paste, validate, format. Sensitive values remain on your machine. The tool may support comments and multi-line values depending on the implementation. Check the tool's docs for exact .env dialect (e.g. dotenv vs Docker env file). Bookmark it for .env cleanup and validation.
Handy for config management and onboarding.