Docker Compose Port Conflict Checker

Paste Docker Compose service text and find duplicate host-port mappings before local containers fail to start.

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This checker is for local development Compose files where multiple services accidentally claim the same host port. Paste a Compose snippet and review the exposed port map.

What it checks

The report extracts common `ports:` mappings such as `8080:80`, `127.0.0.1:5432:5432` and `3000:3000/tcp`, groups them by host port and flags duplicates.

Scope

The parser is intentionally lightweight. It checks pasted Compose text for common mappings; it does not run Docker or fully validate YAML.