Validate Docker Compose Online — YAML Structure Checker

Parse Compose YAML and check services structure. Not a full Compose spec validator.

Docker Compose YAML

0chars0 B1lines

Results

Paste Compose YAML — issues and counts appear in this results panel when validation settles.

YAML is parsed in-browser — structural checks only, not full Compose spec.

Share this tool:

Loading…

Docker Compose validator — YAML structure

Catch missing services keys and empty service definitions before docker compose config in CI — structural checks, not the full Compose specification.

Developer notes

• Rejects YAML multi-document streams (---). • Does not validate ports, networks or deploy keys against the spec. • Unknown top-level keys are info only. • Pair with beautify-yaml for formatting. • Issues and severity counts appear in the results panel (structural Compose checks only).

When teams pick this route

• Validate a compose snippet from Stack Overflow before paste into repo. • Ensure services: exists in a generated file. • Quick check on a minimal dev stack (web + db). • Catch duplicate-document mistakes in merged YAML.

Worked examples

Valid dev stack with web + redis

Compose YAML

version: "3.9"

services:
  web:
    image: nginx:1.25-alpine
    ports:
      - "8080:80"
    depends_on:
      - redis
    networks:
      - frontend

  redis:
    image: redis:7-alpine
    volumes:
      - redis-data:/data
    networks:
      - frontend

networks:
  frontend:
    driver: bridge

volumes:
  redis-data:

Validation result

Valid — services present, each service has image — shown in the results panel.

Missing services key

Compose YAML

version: "3.9"

networks:
  frontend:
    driver: bridge

volumes:
  data:

Validation result

Error — missing required top-level "services" key — shown in the results panel.

Navigate related DevOps tools

Format YAML with beautify YAML. Container images: lint Dockerfile.

Compose validator FAQ

Structural checks

Full Compose spec validation?

No — we check YAML shape and common mistakes, not every key against the spec.

Compose v2 without version?

Root must still be a mapping with services for this tool to pass.

Multi-document YAML?

Rejected — Compose files should be a single document.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

Format Terraform

Validate Terraform

Minify Terraform

Format Dockerfile

Lint Dockerfile

Validate ENV

Explore other tool categories

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

Conversion

Transform data between JSON, YAML, XML and CSV locally — no server uploads.

CSS preprocessors

Compile SCSS or LESS to standard CSS in the browser — pair with beautify or minify for a full stylesheet workflow.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

Networking / IP

CIDR, subnets, and IPv4/IPv6 helpers — in your browser.

Security & tokens

JWKS, X.509 certificates, and secrets scan — browser-local.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Timestamps, UUID, ULID, Nanoid, cron, passwords, regex, slugify, number bases, case, text diff, and chmod — all client-side.

Text & Markdown

Count words, build Markdown TOCs, and clean line lists — all in your browser.

AI & LLM

Token counting, pricing estimates, and context-window fit — 100% browser-local.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.