What configuration issues can it detect?

YAML syntax errors, missing required fields (image or build), invalid port mapping format, invalid volume mount format, duplicate service names.

Is my data uploaded to a server?

No. All validation happens locally in your browser using pure frontend technology.

Does passing validation mean it will definitely run?

Not necessarily. This tool checks syntax and common configuration issues but doesn't verify if images exist or ports are available.

Free Docker Compose Validator

📥 docker-compose.yml

What is Docker Compose Validator?

The Docker Compose Validator is an online tool designed for DevOps engineers and developers that validates docker-compose.yml file syntax and configuration in real-time. Paste your YAML content and the tool instantly checks service definitions, port mappings, volume mounts, network configurations, and pinpoints error line numbers to help quickly resolve configuration issues.

Core Features

YAML Syntax Check: Validates indentation, format, quotes, and other basic YAML syntax issues
Service Configuration Validation: Checks each service for image/build, port mapping format, volume mount format
Network and Volume Validation: Verifies network and volume references are defined
depends_on Check: Validates service dependency references point to defined services
Error Line Detection: Each issue shows the specific line number for quicksetbit

How to Use

Step 1: Paste your docker-compose.yml content, or click example buttons to load samples.

Step 2: Click "Validate" or use Ctrl+Enter shortcut.

Step 3: Review results showing error count, warning count, and passed checks.

Step 4: Fix issues based on error hints and re-validate until passing.

Use Cases

Case 1: CI/CD Pipeline

Validate docker-compose.yml before committing to avoid deployment failures and save CI/CD runtime.

Case 2: Team Collaboration

Team members validate compose files after changes, reducing code review burden.

Case 3: Learning Docker Compose

Beginners get real-time validation feedback while learning correct configuration syntax.

Extended Knowledge

Docker Compose is Docker's official multi-container orchestration tool using YAML files to define services, networks, and volumes. V3 is the current recommended format supporting deploy configuration for Swarm mode. Common top-level keys: services, networks, volumes, configs, secrets. Port mapping format: HOST:CONTAINER. Volume mount format: HOST_PATH:CONTAINER_PATH:MODE.

❓ FAQ

Which Docker Compose version is supported?

Supports V2 and V3 syntax including services, networks, volumes top-level keys.

What issues can it detect?

YAML syntax errors, missing required fields, invalid port/volume formats, duplicate service names.

Is my data uploaded?

No. All processing happens locally in your browser.

Does passing mean it will run?

Not necessarily—runtime issues like missing images aren't checked.

How to fix detected issues?

Each error shows line number and reason. Modify the corresponding line based on the hint.

Does it support extends?

V3 deprecated extends. V2 supports it but this tool doesn't validate extends reference validity.

🐳 Docker Compose Validator