GitHub Actions YAML Validator

How to use this developer tool

1. Paste the source text or load the built-in sample.
2. Adjust the input to match the repository or workload you are checking.
3. Run the tool with the main button or Ctrl/Cmd + Enter.
4. Review every finding, then copy or download the result.

What this developer tool does

GitHub Actions YAML Validator processes the supplied text locally and returns a focused report or configuration. Its output separates blocking input problems from items that need project-specific review.

No source is sent to a server. Always confirm generated configuration in a non-production branch before deployment.

Example

Sample input

name: CI\non:\n  push:\n    branches: [main]\n  pull_request:\njobs:\n  test:\n    runs-on: ubuntu-latest\n    steps:\n      - uses: actions/checkout@v4\n      - run: npm test

Load the sample and run the tool. The output shows the generated file or each finding with enough context to revise the input.

Use cases

• Review configuration during a pull request.
• Diagnose a failing local or hosted pipeline.
• Generate a consistent repository file for a new project.
• Teach the rule behind a warning with a reproducible sample.

Tips for reliable output

• Start with the smallest failing example.
• Keep indentation and line endings consistent.
• Read warnings in the context of repository policy.
• Run the platform’s official validator before deployment.
• Commit generated files separately so changes are easy to review.

Processing details

All parsing and generation runs with Vanilla JavaScript in the browser. The page avoids network requests and exposes structured rows and JSON for the findings it can represent.

Offline checks cannot resolve remote includes, organization policy, secrets, repository history, or third-party metadata. The hosting platform and Git remain authoritative.