DevOps Tools

Docker Compose Environment Validator

Paste your Docker Compose environment variables and check for missing values, duplicates, and unresolved references.

Paste your Compose environment configuration (KEY=value lines, or a Compose environment block) - this tool checks for common configuration mistakes.

Environment Variables (KEY=value, one per line)

Everything you paste here stays in your browser - nothing is sent to or stored on our servers.

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Nothing you paste here is sent anywhere - all checking happens in your browser, and values are never transmitted or stored.

What Does This Tool Check?

It reviews your environment variable list for issues that commonly cause confusing runtime failures: a key listed with no value, the same key defined twice, and a value that references another variable (like ${DB_HOST}) that isn't defined anywhere in the same list.

Why Use This Tool?

A missing or duplicated environment variable often fails silently - the application starts, but a feature depending on that variable breaks in a way that's hard to trace back to the .env or Compose file. This tool surfaces the mistake at the configuration stage.

How to Use It

Paste your KEY=value lines (or a Compose environment: block).
Click Check.
Review any missing values, duplicate keys, or unresolved ${VAR} references.

Important Notes

This is a purely client-side check - your environment values, including anything sensitive, are never sent to a server or stored anywhere by this tool.

Frequently Asked Questions

Variables with empty values, duplicate keys, malformed lines and ${VAR} references that are not defined anywhere in the input.

It reads them from your shell environment and from a .env file next to the compose file. ${VAR:-default} provides a fallback and ${VAR:?error} makes the variable required.

No. The check runs entirely in your browser. Still, avoid pasting real production secrets into any website when test values will do.