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Docker Compose Validator

Check docker-compose.yml for errors, bad ports and risky settings.

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docker-compose.yml

Paste your Compose file

Validation results

Structure, references and security checks

Services
2
Errors
0
Warnings
3
  • version The top-level `version` key is obsolete in the Compose Specification and is ignored by modern Docker Compose.
  • services.web Image `nginx:latest` is unpinned — pin a specific tag or digest for reproducible deploys.
  • services.web No `restart` policy set — consider `unless-stopped` for long-running services.
  • services.db Image `postgres` is unpinned — pin a specific tag or digest for reproducible deploys.
  • services.db No `restart` policy set — consider `unless-stopped` for long-running services.
  • services.db.environment.POSTGRES_PASSWORD Secret-looking value is hardcoded — move it to an env file or a secret.

About the Docker Compose Validator

Paste a Compose file to validate its structure: a services block, image or build on every service, unpinned or :latest tags, duplicate and malformed host port mappings, undefined named volumes and networks, unknown depends_on targets, privileged containers, host networking and missing restart policies.

Examples

Duplicate port

ports:
  - "8080:80"
  - "8080:81"

Output

Error: host port 8080 mapped twice

Keyboard shortcuts

  • Copy the main outputCtrl / ⌘ + Shift + C
  • Download the resultCtrl / ⌘ + S
  • Share this toolCtrl / ⌘ + Shift + S
  • Reset the inputsAlt + R
  • Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-19 · Runs entirely in your browser