Mixing list and map syntax in environment blocks
Compose accepts both FOO=bar lists and FOO: bar maps, but mixing indentation styles often creates invalid YAML. The parser points to the line that breaks the structure.
Free Online YAML Parser, Formatter & Converter
Validate Kubernetes, Docker Compose, and GitHub Actions YAML files with live syntax checking. Your YAML stays in your browser — no sign-up required.
No output yet
Enter valid YAML to see parsed result
A focused toolset for developers who work with configuration files daily.
Real-time syntax checking with precise line and column error reporting. Catch YAML mistakes instantly as you type.
Bidirectional YAML↔JSON conversion with one-click beautification. Preserve comments and structure.
Pre-loaded presets for Kubernetes, Docker Compose, and GitHub Actions. Start from a real-world example.
Your YAML and JSON stay in your browser for core validation, formatting, conversion, and Tree View inspection.
Copy or download your results instantly. No sign-up, no friction — just clean output.
Coming soon: AI-powered YAML repair that suggests fixes for common configuration errors.
Docker Compose file checker
Docker Compose files are compact but easy to break when services, volumes, networks, environment variables, and healthchecks grow. Use this page to catch YAML syntax errors before docker compose up.
Compose accepts both FOO=bar lists and FOO: bar maps, but mixing indentation styles often creates invalid YAML. The parser points to the line that breaks the structure.
Strings such as 8080:80 or ./data:/var/lib/data should usually be quoted when a parser or generator changes meaning. Convert to JSON to inspect the parsed result.
CI templates and env substitution can output invalid Compose YAML. Paste the final generated file here before deploying to staging or production.
Paste or drag your docker-compose.yml file into the editor.
Validate the YAML structure and fix any highlighted parser errors.
Use Format to normalize indentation before committing the file.
Copy or download the cleaned output for your repository or deploy script.
This page focuses on YAML syntax and parsed structure. Run docker compose config for Compose-specific schema and interpolation checks.
Quoting port and volume mappings is often safer, especially when files are generated by templates or processed by multiple parsers.
No. The tool runs in your browser and does not upload Compose content to a server.
Quick answers to common questions.
Yes. All core features — validation, formatting, and conversion — are free to use without any sign-up or account required.