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YAML Formatter / Validator

Format, validate, and convert YAML locally—Kubernetes, GitHub Actions, Docker Compose, JSON ↔ YAML, with line/column error hints.

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Paste YAML or JSON to begin. All processing runs locally.

YAML Course

Learn YAML for configs and DevOps: syntax, JSON differences, Kubernetes and CI workflows, and debugging.

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About this tool

DevCove YAML Formatter / Validator helps platform engineers, DevOps developers, and backend teams clean configuration files without uploading them. Format messy YAML with indent and key-sort options, validate manifests before kubectl apply, convert JSON exports to YAML for GitHub Actions or Docker Compose, and inspect parse errors with line and column hints—all in your browser.

How to use this tool

Use this tool when you edit Kubernetes, CI, or application config files:

  1. Choose Format to prettify pasted YAML with consistent indentation before committing or applying manifests.
  2. Use Validate to check syntax without changing the text—helpful after kubectl or CI errors point to a broken file.
  3. Switch to Convert for JSON ↔ YAML when importing API exports, Helm values, or generated config into human-editable YAML.
  4. Load Kubernetes, GitHub Actions, or Docker Compose examples to see realistic indentation and key structure.
  5. Enable sort keys when you want deterministic ordering for reviews and diffs.
  6. Copy share links to send reproducible examples to teammates without pasting secrets into chat.

Features

Built for DevOps, platform, and backend configuration workflows:

  • YAML format, validate, minify, and JSON ↔ YAML conversion in one workspace.
  • Line and column hints for parse errors.
  • Indent options: 2 spaces, 4 spaces, or tabs.
  • Optional stable key sorting for cleaner diffs.
  • Examples for Kubernetes Deployments, GitHub Actions, and Docker Compose.
  • Apply formatted output back to the editor or copy results.
  • Share links for format, validate, and convert states.
  • 100% browser-local processing; configs are not uploaded.
  • Complements the JSON Formatter for mixed JSON/YAML pipelines.

FAQ

Will this tool run kubectl apply for me?

No. It only formats, validates, and converts text locally. You still apply manifests with kubectl or your GitOps pipeline after reviewing them.

Why do I see line and column numbers on errors?

YAML is indentation-sensitive. Line and column hints map parser failures back to the exact spot in your manifest or workflow file.

Does sorting keys change YAML meaning?

No for standard mappings. Sorting only changes key order for readability and diffs; values and structure stay the same.

Can I convert JSON from an API to YAML?

Yes. Use Convert → JSON → YAML, paste the JSON export, and copy the YAML result into a config file or Helm values draft.

Is my YAML uploaded?

No. Parsing, formatting, and conversion run entirely in your browser.

How is this different from the JSON Formatter YAML tab?

This dedicated YAML tool focuses on config-file workflows: validate-only mode, minify, scenario examples, line/column errors, and share links tuned for manifests and CI files.