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Docker Compose Validator

Validate Docker Compose YAML files (v2/v3). Check for syntax errors, required fields, version compatibility, and common configuration mistakes.

Docker Compose YAML

Drop a file or click to browse

✓ Valid1 issue

ℹ

version

No 'version' field — using Compose Specification (recommended).

info

Formatted YAML

services:
  web:
    image: nginx:latest
    ports:
      - '80:80'
    depends_on:
      - db
    environment:
      - ENV=production
  db:
    image: postgres:15
    environment:
      POSTGRES_DB: mydb
      POSTGRES_USER: user
      POSTGRES_PASSWORD: secret
    volumes:
      - db-data:/var/lib/postgresql/data
volumes:
  db-data: null

About Docker Compose Validator

Docker Compose is a tool for defining multi-container Docker applications using a YAML file. This validator checks your compose file for YAML syntax errors, required fields (like 'services'), and common mistakes such as services missing both 'image' and 'build' directives, malformed port mappings, and the deprecated top-level 'version' key. It also reformats the YAML for consistency. Compatible with both Docker Compose v2 and the modern Compose Specification.

Private & free — this tool runs entirely in your browser.