Turn a compact JSON definition into a GitHub Actions strategy matrix. Arrays become matrix dimensions, while include and exclude entries remain explicit. The output also estimates the number of generated jobs, making accidental workflow explosions easier to catch before a push.
The Cartesian product of array dimensions determines the base job count. Matching exclude objects remove combinations, and include entries are retained in the YAML block.
GitHub limits a workflow job matrix to 256 jobs. Split a large matrix or reduce dimensions before committing it.
Try the sample input built into the page. The result uses the same validation and export path as pasted content.
{"os":["ubuntu-latest","windows-latest"],"node":[18,20,22],"exclude":[{"os":"windows-latest","node":18}]}Keys and scalar values are serialized as YAML-safe strings when needed. include and exclude must be arrays of objects.
The estimated count handles full-match exclusions; GitHub expression expansion and dynamically supplied matrices are outside this local calculation.
Use the format shown in the sample. The page validates required fields and reports malformed lines or values before producing output.
No. Processing happens in your browser and the core function makes no network request.
Yes, after reviewing repository-specific names, permissions, paths, and policies that a browser-only tool cannot verify.
Hosted services may apply repository context, current platform rules, presets, or permissions that are unavailable to this local check.
Yes. The input and downloaded files use UTF-8, although the target format may impose narrower naming or syntax rules.
| Item | Meaning |
|---|---|
| Output | Copy-ready YML or text |
| Processing | Local browser execution |
| Network | Not required |
Browse generators, parsers, validators, and helpers for Git configuration and repository workflows.
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