YAML Validator
FreeValidate YAML files for syntax errors
About YAML Validator
YAML's reliance on indentation makes it easy to read and dangerously easy to break, since one stray tab or a misaligned key can silently change meaning or stop a pipeline cold. The YAML Validator from ToolHub by Codaiman parses your file the way a real YAML engine would and tells you immediately whether it is syntactically sound.
Paste a Kubernetes manifest, a CI workflow, a Docker Compose file, or any other YAML, and the tool reports parsing errors with the context you need to find them, including indentation and structure issues that are otherwise hard to spot. It runs fully in your browser with no signup and returns results instantly, so configs that may contain secrets or environment details never leave your computer. Use it as much as you need, free of charge.
Common uses
- Validating a GitHub Actions or GitLab CI workflow before pushing to avoid a failed pipeline run
- Checking a Kubernetes manifest or Helm values file for indentation and syntax errors
- Confirming a docker-compose.yml parses correctly after editing service definitions
- Spotting tab-versus-space indentation problems that break a YAML loader
- Reviewing an Ansible playbook or app config file for structural mistakes
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Instant error detection
- Detailed error messages
- Standards compliant
FAQ
Does it catch indentation errors?
Yes. Indentation is central to YAML, and the tool reports inconsistent or invalid indentation along with other syntax problems.
Does it support multi-document YAML files?
Yes, files using the --- separator to hold multiple documents are parsed correctly.
Will it flag tabs used for indentation?
Yes. YAML disallows tabs for indentation, and the tool will report them as errors.
Is my configuration kept private?
Yes. Parsing happens in your browser, so manifests and configs containing secrets are never uploaded.
Can I use YAML Validator on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.