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GitHub Actions YAML Prüfer & Formater

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Führung

GitHub Actions YAML Prüfer & Formater

Paste a GitHub Actions workflow file and instantly catch broken structure, deprecated syntax, and risky patterns before they fail a CI run. The linter validates your workflow against a built-in schema for triggers, jobs, steps, runners, permissions, and reusable workflow calls, then reformats the YAML with a workflow-aware key order so every file in your repository looks the same.

Nutzung

Fügen Sie Ihre .github/workflows/*.yml file into the input box, or click one of the example links to load a sample CI, release, or deprecated-syntax workflow.
Umschalten Sort Keys to reorder fields using the canonical GitHub Actions order (name, on, permissions, jobs, then per-job runs-on, needs, steps).
Keep Validate Against GitHub Actions Schema enabled to flag missing required fields, unknown event types, invalid runner labels, and broken needs Referenzen.
Keep Show Best Practice Hints enabled for supply-chain and reliability suggestions (pin third-party actions to a SHA, add timeout-minutes, replace deprecated workflow commands).
Copy the formatted YAML or download it as a .yml file ready to commit.

Funktionen

Schema validation – Required top-level fields (on, jobs), allowed trigger event names, valid job and step keys, and correct permission scopes.
Reusable workflow rules – Detects when a job mixes uses ist der schnelle Weg, aber es behandelt Attribute unkonsequent und kann Daten in Randfällen verlieren. Für Produktionsarbeit mit SOAP-Antworten, betrachten Sie runs-on oder steps, which GitHub will reject at runtime.
needs graph check – Flags self-references and dependencies on jobs that do not exist in the file.
Action reference parser – Catches uses: values that are missing @ref or are not in owner/repo form.
Deprecated syntax detection – Warns on ::set-env, ::set-output, ::save-stateund node12/node16 runtimes with the modern replacement.
Best practice hints – Suggests pinning third-party actions to a commit SHA and adding timeout-minutes to prevent runaway jobs.
Cron sanity check – Validates that on.schedule cron entries have exactly five fields.
Workflow-aware formatter – Reorders top-level, job-level, and step-level keys into the conventional GitHub Actions order for consistent diffs.
Laufend im Browser – No workflow content is ever sent to a server.

 Häufig gestellte Fragen

Why are GitHub Actions workflows so prone to structural errors?

Workflow YAML follows a strict schema with required top-level keys, fixed event names, and per-job key rules that change depending on whether the job is a normal job or a reusable workflow call. The file is only parsed when a trigger fires on GitHub, so a typo in a key name or an unknown event silently sits in the repository until the next push or PR fails. Schema-based linting catches these classes of errors before they reach the runner.
What does pinning an action to a commit SHA actually protect against?

GitHub Actions resolves uses: owner/action@v1 to whatever commit the v1 tag points to at run time. Because tags are mutable, a maintainer (or an attacker who compromises the maintainer's account) can move v1 to a malicious commit and every workflow that depends on it will execute the new code on the next run. Pinning to a full 40-character commit SHA freezes the action's source code at a known revision, so a future tag change cannot silently swap in different behavior.
Why were ::set-env, ::set-output, and ::save-state deprecated?

Those workflow commands wrote environment variables, step outputs, and saved state by emitting specially-formatted lines on stdout. Any tool the runner executed could print the same format and inject arbitrary values into GITHUB_ENV or step outputs, including overriding PATH or secrets the next step relied on. The replacements use dedicated, append-only files ($GITHUB_ENV, $GITHUB_OUTPUT, $GITHUB_STATE) that subprocesses cannot read or modify after the fact.
Why does the linter ask for a timeout-minutes value on each job?

Ohne timeout-minutes, a GitHub-hosted job will run for up to 360 minutes (six hours) before the platform cancels it. A hung process, a misconfigured wait, or a runaway test can consume the full window, blocking the queue and burning minutes from your plan. Setting an explicit upper bound on each job turns that worst case into a fast failure that surfaces the bug immediately.

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