DevCoreTools

Docker Compose Formatter / Validator

Paste a Docker Compose file to format YAML, validate structure, and review service, volume, network, and environment warnings.

Paste Docker Compose YAML or load a sample to begin.

Docker Compose YAML

Paste docker-compose.yml content. The tool parses YAML locally and checks Compose services, volumes, networks, configs, and secrets.

Processed locally in your browser Limit 5 MB. Your input is processed in your browser and is not uploaded or sent to a server. Avoid pasting production secrets, access tokens, private keys, passwords, or sensitive customer data unless you understand the risk.

Formatted YAML

Formatted output appears after validation.

Compose validation

Structure, resources, and service checks

Validate Docker Compose YAML to see service counts, named resources, findings, and a service summary table.

Docker Compose Guide

Format YAML with Compose-aware checks

This tool is for docker-compose.yml and compose.yml files where generic YAML validation is not enough.

Compose vs generic YAML

Generic YAML tools can tell you whether syntax parses. This validator also checks services, named volumes, networks, configs, secrets, ports, environment values, dependencies, and healthcheck shapes.

Service checks

Each service is inspected for image or build configuration, ports, environment, env_file, volumes, networks, depends_on, command, restart, and healthcheck fields.

Common mistakes

The report warns about missing services, empty service definitions, invalid ports, undefined named resources, legacy version usage, and environment variable names that look sensitive.

Secrets caution

Compose files often contain development credentials. Validation runs locally, and the tool never executes containers, reads env files, pulls images, or contacts Docker registries.

Formatting behavior

Formatting normalizes YAML indentation and structure. Comments and original spacing may not be preserved, so review the output before replacing a hand-written file.

Reports

Copy or download the JSON report for pull request notes, CI discussion, or local troubleshooting without including the original Compose YAML in analytics.

Docker Compose Formatter FAQ

Does this run Docker?

No. It only parses and inspects YAML text in the browser. It does not execute containers, read local files, pull images, or call registries.

Is this different from YAML validation?

Yes. YAML validation checks syntax, while this page also understands Compose concepts such as services, ports, named volumes, networks, configs, and secrets.

Are comments preserved?

Formatting may not preserve comments or original spacing. Keep a backup when replacing a manually edited compose file.

Can I download the formatted file?

Yes. Use the download action to save the formatted output as docker-compose.yml.

Does DevCoreTools store my Compose file?

No. Processing is local in your browser and the tool does not upload or store Docker Compose content.

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