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Web App Manifest Checker API
PWA manifest and installability report as JSON
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.
Top comment
Hi everyone, this is Web App Manifest Checker API. Give it a page URL and it finds the site's Web App Manifest, fetches it and validates it against the W3C Web App Manifest spec, returning JSON: coded issues, an overall grade (A+ to F), a score out of 100 and an installability verdict with the blockers that stop Chrome from offering install. The installability verdict follows Chrome's manifest-level install criteria only (name or short_name, same-origin start_url inside scope, installable display mode, a 192px icon, no prefer_related_applications, HTTPS). Everything else (512px and maskable icons, colors, lang, shortcuts, screenshots) is quality advice. The grade and score use our own weighting; this is not a Lighthouse score and does not guarantee that a browser will show an install prompt. Two endpoints: - GET /v1/check?url= reads the page (up to 5 redirects, first 512 KB of HTML), follows its manifest link and checks the manifest. Cached for 6 hours per URL; fresh=1 bypasses the cache. - POST /v1/validate checks manifest JSON you paste in, offline, with no outbound request. Limits: service workers, offline support and whether icon files actually load are not checked. Manifest tags injected by JavaScript and manifests declared only in an HTTP Link header are not detected. Sites that block datacenter traffic return grade unchecked. Private-network targets are rejected. Examples measured on 2026-10-13: web.dev scored B (86) and installable; starbucks.com was reported not installable because display is missing. Where to find it: RapidAPI (public, https://rapidapi.com/tossneon0/a...), API.Market and APIHub; Zyla is in review. Product site: https://web-manifest.glowhalo.org Feedback on the checks and the scoring is welcome.
About Web App Manifest Checker API on Product Hunt
“PWA manifest and installability report as JSON”
Web App Manifest Checker API was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #302 on the daily leaderboard. 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.
On the analytics side, Web App Manifest Checker API competes within API — topics that collectively have 98.8k followers on Product Hunt. The dashboard above tracks how Web App Manifest Checker API performed against the three products that launched closest to it on the same day.
Who hunted Web App Manifest Checker API?
Web App Manifest Checker API was hunted by GlowHalo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Web App Manifest Checker API including community comment highlights and product details, visit the product overview.