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YAML Validate

Strict YAML parser with structural diagnostics. Different from json-yaml (which just converts) — this one catches duplicate keys, undefined anchors, and reports the precise line and column of any failure.

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About YAML Validate

YAML Validate is a strict parser that does more than confirm a file loads: it reports duplicate keys, undefined anchors, and the exact line and column of any failure. Unlike a converter that simply transforms YAML, this tool exists to catch the structural mistakes that silently break CI pipelines and app configs. It validates locally in your browser, so secrets in your config files never get uploaded.

Category
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Input
Accepts: text/yaml, text/x-yaml, application/yaml or text/plain.
Output
Outputs: application/json.
Cost
Free, runs in your browser
Memory
low
Privacy: YAML Validate runs entirely on your device. Files you provide never leave your browser — no uploads, no server, no tracking. The page works offline once loaded.

Common uses

  • Catch a duplicate key in a GitHub Actions or GitLab CI workflow before it merges and breaks the build
  • Find the precise line and column of a YAML error in a Kubernetes manifest
  • Detect an undefined anchor reference in a docker-compose or Ansible file
  • Sanity-check a hand-edited application config before deploying it
  • Validate a YAML data file an app loads at startup so you don't ship a crash
  • Confirm indentation and structure are sound after merging a tricky config conflict

Frequently asked questions

How is this different from a JSON-YAML converter?

A converter just transforms valid YAML; this tool is a strict validator that surfaces duplicate keys, undefined anchors, and exact failure positions even when conversion would silently mask them.

Does it report where the error is?

Yes. Failures come back with the precise line and column, so you can jump straight to the problem.

What YAML inputs are accepted?

It accepts text/yaml, text/x-yaml, application/yaml, and plain text, so pasted YAML works fine.

Is my config sent to a server?

No. Parsing and diagnostics run entirely in your browser; nothing is uploaded.

Will it flag duplicate keys?

Yes. Duplicate mapping keys are a common silent bug, and this validator reports them rather than quietly keeping the last value.

Keywords

  • yaml
  • validate
  • parse
  • lint
  • syntax
  • config

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