Click Generate to create compose file
Visual Docker Compose generator. Add services, configure ports, environment variables, volumes, and dependencies to generate ready-to-use compose files.
What is Docker Compose Generator & Formatter?
Docker Compose is a tool for defining and running multi-container applications through a single YAML configuration file called docker-compose.yml. Instead of writing long docker run commands for each service, you declare services, networks, and volumes declaratively, and Docker Compose handles creation, networking, dependency ordering, and teardown. This tool offers two modes: a visual Generator that produces compose files through a form interface without requiring YAML knowledge, and a Formatter that beautifies and validates existing docker-compose YAML with consistent indentation and quoting.
How to Use
- In Generator mode, add services by name and Docker image, then configure ports, environment variables, volumes, and dependencies for each
- In Formatter mode, paste existing docker-compose YAML and click Format to normalize indentation, quoting, and spacing
- Set the compose file version — 3.8 is recommended for modern Docker features including healthchecks and deploy configs
- Use the Validate button to check for structural errors like duplicate service names, missing images, or invalid port mappings
- Copy the output and save it as docker-compose.yml in your project root
Why Use This Tool?
Tips & Best Practices
- Use restart: always for production services and restart: unless-stopped for services you may want to stop manually
- Mount named volumes for database data directories — without them, data is lost when containers are recreated
- Use depends_on to control startup order, and combine it with healthchecks for true readiness checks
- Port mapping format is host_port:container_port — map different host ports when running multiple services on the same internal port
- Alpine-based images (nginx:alpine, redis:alpine) are significantly smaller and reduce attack surface
- Formatter adds blank lines between service blocks for better readability in code reviews
Frequently Asked Questions
What is Docker Compose and when should I use it?
Docker Compose is a tool for defining multi-container applications in a single YAML file. Instead of running separate docker run commands for each service, you declare all services, their configurations, and relationships in docker-compose.yml, then start everything with docker compose up. Use it for local development environments, CI/CD pipelines, and small production deployments.
What does the Formatter mode do?
The Formatter takes existing docker-compose YAML and reformats it with consistent 2-space indentation, proper quoting for port mappings and special values, and blank lines between service blocks for readability. It also validates the structure for common issues like missing version or services keys, tab characters, and duplicate service names.
What compose file version should I use?
Version 3.8 is recommended for modern Docker features including healthchecks, deploy configs, and placement constraints. Version 3.x supports Docker Swarm mode, while version 2.4 works for older setups. Most new projects should use 3.8 — the version field is actually optional in modern Docker Compose V2 but remains useful for documentation.
When should I NOT use Docker Compose?
Avoid Docker Compose for large-scale production deployments that need auto-scaling, rolling updates, or multi-node orchestration — use Kubernetes or Docker Swarm instead. Also, Docker Compose is not ideal for stateful applications with complex storage requirements that need dynamic volume provisioning.
Is my configuration data private when using this tool?
Yes. All generation, formatting, and validation happen entirely in your browser. Your service configurations, environment variables, and volume definitions are never sent to any server, logged, or stored.
How do I run the generated compose file?
Save the output as docker-compose.yml in your project directory, then run docker compose up to start all services. Add -d for detached mode (background). Use docker compose down to stop and remove containers, and docker compose logs to view aggregated service logs.
Real-world Examples
Full-stack web application stack
A typical production setup with nginx reverse proxy, Node.js backend, PostgreSQL database, and Redis cache, each with appropriate volume mounts and restart policies.
Frontend: nginx:alpine on port 80 Backend: node:18 on port 3000 Database: postgres:15 on port 5432 Cache: redis:alpine on port 6379
version: '3.8'
services:
frontend:
image: nginx:alpine
ports: ['80:80']
depends_on: [backend]
restart: always
backend:
image: node:18
ports: ['3000:3000']
depends_on: [db, redis]
restart: always
db:
image: postgres:15
volumes: [postgres_data:/var/lib/postgresql/data]
restart: always
redis:
image: redis:alpine
restart: alwaysDevelopment environment with hot reload
A development setup with mounted source code volumes for live editing, plus Adminer for database management.
App: node:18 with ./src mounted to /app DB: postgres:15 with ./data mounted Admin: adminer for database UI
version: '3.8'
services:
app:
image: node:18
volumes: ['./src:/app']
ports: ['3000:3000']
db:
image: postgres:15
volumes: ['./data:/var/lib/postgresql/data']
admin:
image: adminer
ports: ['8080:8080']