GitHub Actions Matrix Generator — Build, Validate & Optimize CI/CD Matrices
Define OS and runtime version combinations and generate the strategy.matrix configuration block
How to Use GitHub Actions Matrix Generator — Build, Validate & Optimize CI/CD Matrices
How to Use the GitHub Actions Matrix Builder
Step 1: List Your Operating Systems
Enter a comma-separated list of runner labels, e.g. ubuntu-latest, windows-latest, macos-latest.
Step 2: Set the Runtime Axis
Name the runtime axis (e.g. node-version, python-version, go-version) and enter a comma-separated list of versions to test. Version values are always quoted in the output so YAML never silently truncates values like 3.10 down to 3.1.
Step 3: Add Include/Exclude Entries (optional)
Use Include to add extra combinations (e.g. an experimental build on a specific OS/version pair) or Exclude to skip a combination that does not need testing. Each row takes comma-separated key=value pairs, e.g. os=windows-latest, node-version=18.
Step 4: Copy the Block
The strategy.matrix YAML block updates in real time. Paste it under a job in your workflow file, alongside runs-on: ${{ matrix.os }}.
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