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GitHub Actions Validator

Name: GitHub Actions Validator - WebUtil
Author: WebUtil

Validate GitHub Actions workflow YAML files — check triggers, jobs, steps, and required action syntax.

GitHub Actions Workflow YAML

Validation Results

What Is a GitHub Actions Validator?

A GitHub Actions validator checks your workflow YAML files for correct structure, valid trigger events, proper job configuration, and action reference syntax. GitHub Actions workflows are YAML files stored in .github/workflows/ that define CI/CD pipelines. Missing required fields, invalid triggers, or incorrect action references can cause workflow failures. Our GitHub Actions linter catches these issues before you push to your repository.

Key GitHub Actions Concepts

Workflows

YAML files that define automated processes. Each workflow has a name, on trigger, and jobs.

Jobs

A set of steps that run on the same runner. Jobs can run in parallel or sequentially using needs.

Steps

Individual tasks within a job. Steps use uses (for actions) or run (for shell commands).

How to Use This Workflow Validator

Paste your GitHub Actions workflow YAML into the textarea and click Validate. The tool checks for the name field, verifies that on triggers are valid events, confirms jobs are defined with runs-on, and ensures each step has uses or run. Action references are checked for the @version format. Use Load Example for a sample CI workflow.

Tips for Valid GitHub Actions Workflows

Always pin action versions — Use @v4 or @sha instead of @main to avoid unexpected breaking changes.
Use specific trigger events — Filter pushes and pull requests with branches: to avoid running CI on every branch.
Set a runner explicitly — Each job needs runs-on. Common choices are ubuntu-latest, windows-latest, or macos-latest.
Use matrix strategies — Test across multiple OS or language versions with strategy.matrix to avoid duplicating jobs.
Cache dependencies — Use actions/cache@v4 to speed up workflows by caching node_modules, ~/.m2, or other dependency directories.

GitHub Actions is the premier CI/CD automation platform integrated natively into GitHub repositories, executing automated build, test, lint, and deployment pipelines. Workflows are configured using YAML files located in the `.github/workflows/` directory. Each workflow defines triggers (`on: [push, pull_request]`), jobs running on virtual runners (`runs-on: ubuntu-latest`), execution steps (`steps`), action references (`uses: actions/checkout@v4`), and shell commands (`run`). Because GitHub Actions charges for runner compute minutes and pipeline execution happens asynchronously after a git push, syntax mistakes—such as indentation errors in matrix strategies, malformed expression syntax (`${{ ... }}`), or invalid step keys—cause frustrating build failures and wasted developer time. Validating workflow YAML files before committing guarantees that job dependencies (`needs`), trigger filters, and action parameters conform to GitHub's workflow schema. WebUtil's GitHub Actions Validator checks workflow syntax, verifies trigger and job hierarchies, and checks step declarations entirely in your browser with zero data transmission.

How to Do This in Code

gh workflow view
yq eval .github/workflows/ci.yml

const yaml = require('js-yaml');
const fs = require('fs');
const wf = yaml.load(fs.readFileSync('.github/workflows/ci.yml', 'utf8'));
console.log('Jobs:', Object.keys(wf.jobs || {}));

import yaml
with open('.github/workflows/ci.yml') as f:
    wf = yaml.safe_load(f)
print('Name:', wf.get('name'))
print('Jobs:', list(wf.get('jobs', {}).keys()))

import ("os"; "gopkg.in/yaml.v3")

data, _ := os.ReadFile('.github/workflows/ci.yml')
var wf map[string]any
yaml.Unmarshal(data, &wf)

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GitHub Actions Validator FAQ

What is the required structure of a GitHub Actions workflow YAML file?

A valid workflow requires: 'name:' (optional but recommended), 'on:' (trigger events), and 'jobs:' containing one or more jobs with 'runs-on:' and 'steps:' arrays.

What are the most common GitHub Actions syntax errors?

Common errors include: incorrect indentation under 'steps:', forgetting the pipe character (|) for multiline 'run:' scripts, malformed expression brackets ${{ }}, and invalid action names.

How do trigger events (push, pull_request, schedule) work in workflow syntax?

The 'on:' block defines when workflows run. You can filter by branches, tags, paths, pull request activity types, or cron schedules (e.g. schedule: - cron: '0 0 * * *').

How do I format multiline bash scripts under 'run' steps?

Use the YAML literal block scalar indicator '|' under run: to execute multi-line shell commands without needing continuation backslashes.

Are my CI/CD deployment scripts and secret references safe?

Yes. Validation runs entirely inside your browser. No workflow definitions, repository names, or secret identifiers are ever sent to any server.