Docker Compose Validator

# What Is Docker Compose Validation?

Docker Compose validation checks your docker-compose.yml file for syntax errors and common configuration issues before you run it. A valid Compose file ensures that services are correctly defined, images or build contexts are specified, port mappings are properly formatted, and dependencies like depends_on, volumes, and networks reference existing resources.

This validator analyzes YAML structure, service definitions, and cross-references to catch problems early. It helps developers avoid runtime failures caused by misconfigured volume mounts, missing networks, invalid port ranges, or incorrect environment variable syntax. Whether you are deploying a simple web app or a complex microservices architecture, validating your Compose file before running docker-compose up saves time and prevents costly mistakes.

# How to Use This Tool

1. Paste your docker-compose.yml — Copy and paste your Compose file content into the input area.
2. Load an example — Use the Valid, Web App, or Has Issues example buttons to see how the validator works.
3. Click Validate — The tool parses your YAML, checks service definitions, and reports any issues found.
4. Review the results — Check the status (PASS/FAIL), error count, and service count. Each issue includes a description and line reference.
5. Fix and re-validate — Correct any issues in your Compose file and validate again until all errors are resolved.

# Frequently Asked Questions