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Web App Manifest Checker API

Web App Manifest Checker API

PWA manifest and installability report as JSON

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Give it a page URL and get a JSON report on its Web App Manifest: the manifest is located, fetched and validated against the W3C spec, with coded issues, a grade (A+ to F), a score out of 100 and an installability verdict with blockers. A second endpoint validates manifest JSON you paste in, offline. For CI gates and PWA audits without running Lighthouse.

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