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Docker Compose Validator

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

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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.

Popular uses

  • docker compose validator
  • docker-compose.yml linter
  • compose file checker
  • docker yaml validator

Examples

Duplicate port

YAMLports:
  - "8080:80"
  - "8080:81"

Output

YAMLError: 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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Works well with

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Frequently asked questions

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