Docker Compose Validator
Validate docker-compose.yml — YAML syntax, indentation, tabs, and services presence. Catch the tab indent breaking deploys — local validation, free, no signup.
How to Use the Docker Compose Validator
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Frequently Asked Questions
What breaks compose files most?
Tab indentation (YAML forbids tabs), missing services: key, and version/top-level mismatches. The validator flags all three with line numbers.
Tabs vs spaces?
Spaces only, consistently 2 per level — one tab anywhere fails the whole file. Mixed indentation flags immediately.
Validate before deploy?
Always — plus docker compose config dry-run locally. Caught errors here save failed-deploy cycles in CI.
Is my compose file uploaded?
No — validation runs locally in your browser. Configs never leave your device.
What exactly does it check?
Each line is scanned for jumps over 2 spaces (Over-indented), any tab, and 2+ colons; then the file must contain services: and match 8 known keywords (apiVersion, kind, metadata, spec, services, image, ports, volumes). Verdicts read Valid Docker Compose or Invalid, the report downloads as docker-compose-validation.txt, and 3 presets ship (Web Service, Multi-service, Clear).
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Last updated October 2026