Web App Manifest Checker API

API ID 14245

Give it a page URL and get back a JSON report on that site's Web App Manifest: the manifest is located, fetched and validated, and the result lists coded issues, an overall grade (A+ to F), a score

API Documentation

Endpoints

Request
Fetches the page and follows up to 5 redirects, finds the manifest link tag, fetches the manifest and validates it. Results are cached for 6 hours and the fresh parameter bypasses the cache. A value without a scheme such as example.com is treated as https.
Endpoint ID: 35363
GET https://zylalabs.com/api/14245/web+app+manifest+checker+api/35363/check+the+web+app+manifest+of+a+url
INPUT PARAMETERS

Check the Web App Manifest of a URL — Endpoint Features

Object Description
url Required Page to inspect, e.g. https://web.dev. Aliases u, link, target, site, website, domain and host are also accepted (case-insensitive).
fresh Optional Set to 1 to bypass the 6-hour result cache.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

url
fresh
API EXAMPLE RESPONSE
JSON
{
    "url": "https://web.dev/",
    "finalUrl": "https://web.dev/",
    "statusCode": 200,
    "cached": false,
    "checkedAt": "2026-10-13T23:42:25.027Z",
    "note": "Service workers and icon file reachability are not evaluated; only the page HTML and the manifest JSON are read.",
    "found": true,
    "manifestUrl": "https://web.dev/_pwa/web/manifest.json",
    "manifestStatus": 200,
    "page": {
        "manifestLinks": 1,
        "themeColorMeta": "#3740ff",
        "viewport": "width=device-width, initial-scale=1",
        "appleTouchIcon": true,
        "https": true
    },
    "installability": {
        "installable": true,
        "blockers": []
    },
    "grade": "B",
    "score": 86,
    "summary": {
        "errors": 0,
        "warnings": 1,
        "infos": 4
    },
    "manifestSummary": {
        "name": "web.dev",
        "shortName": "web.dev",
        "id": null,
        "startUrl": "https://web.dev/",
        "scope": null,
        "display": "standalone",
        "displayOverride": null,
        "orientation": "portrait",
        "themeColor": "#3740ff",
        "backgroundColor": "#fff",
        "lang": null,
        "dir": null,
        "iconCount": 8,
        "hasMaskableIcon": false,
        "screenshotCount": 0,
        "shortcutCount": 0
    },
    "icons": [
        {
            "src": "icons/icon-72x72.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-72x72.png",
            "sizes": "72x72",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-96x96.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-96x96.png",
            "sizes": "96x96",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-128x128.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-128x128.png",
            "sizes": "128x128",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-144x144.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-144x144.png",
            "sizes": "144x144",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-152x152.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-152x152.png",
            "sizes": "152x152",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-192x192.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-192x192.png",
            "sizes": "192x192",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-384x384.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-384x384.png",
            "sizes": "384x384",
            "type": "image/png",
            "purpose": "any"
        },
        {
            "src": "icons/icon-512x512.png",
            "resolved": "https://web.dev/_pwa/web/icons/icon-512x512.png",
            "sizes": "512x512",
            "type": "image/png",
            "purpose": "any"
        }
    ],
    "issues": [
        {
            "severity": "info",
            "code": "description_missing",
            "message": "No \"description\"; Chrome shows it in the richer install dialog and app stores use it."
        },
        {
            "severity": "info",
            "code": "id_missing",
            "message": "No \"id\"; Chrome falls back to \"start_url\" as the app identity, so changing start_url later makes it a different app. Set an explicit \"id\"."
        },
        {
            "severity": "info",
            "code": "lang_missing",
            "message": "No \"lang\"; screen readers and translation tools cannot tell the language of \"name\" and \"description\"."
        },
        {
            "severity": "warning",
            "code": "no_maskable_icon",
            "message": "No icon with purpose \"maskable\"; Android launchers will shrink your icon onto a white circle or square instead of filling the adaptive shape."
        },
        {
            "severity": "info",
            "code": "screenshots_missing",
            "message": "No \"screenshots\"; Chrome shows them in the richer install dialog, which improves installs."
        }
    ]
}
Check the Web App Manifest of a URL — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14245/web+app+manifest+checker+api/35363/check+the+web+app+manifest+of+a+url?url=https://web.dev&fresh=1' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Validates a manifest you provide, with no outbound request. Pass manifestUrl to resolve relative URLs and enable same-origin checks.
Endpoint ID: 35364
POST https://zylalabs.com/api/14245/web+app+manifest+checker+api/35364/validate+manifest+json+offline
INPUT PARAMETERS

Validate manifest JSON offline — Endpoint Features

Object Description
Request Body Required Json

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

API EXAMPLE RESPONSE
JSON
{
    "grade": "C",
    "score": 74,
    "summary": {
        "errors": 0,
        "warnings": 2,
        "infos": 6
    },
    "installability": {
        "installable": true,
        "blockers": []
    },
    "assumptions": {
        "manifestUrl": "https://example.com/manifest.webmanifest",
        "note": "Validated offline; the page HTTPS requirement is not evaluated."
    },
    "manifestSummary": {
        "name": "My App",
        "shortName": "App",
        "id": null,
        "startUrl": "https://example.com/",
        "scope": null,
        "display": "standalone",
        "displayOverride": null,
        "orientation": null,
        "themeColor": null,
        "backgroundColor": null,
        "lang": null,
        "dir": null,
        "iconCount": 1,
        "hasMaskableIcon": false,
        "screenshotCount": 0,
        "shortcutCount": 0
    },
    "icons": [
        {
            "src": "/icon-192.png",
            "resolved": "https://example.com/icon-192.png",
            "sizes": "192x192",
            "type": "image/png",
            "purpose": "any"
        }
    ],
    "issues": [
        {
            "severity": "info",
            "code": "description_missing",
            "message": "No \"description\"; Chrome shows it in the richer install dialog and app stores use it."
        },
        {
            "severity": "info",
            "code": "id_missing",
            "message": "No \"id\"; Chrome falls back to \"start_url\" as the app identity, so changing start_url later makes it a different app. Set an explicit \"id\"."
        },
        {
            "severity": "info",
            "code": "theme_color_missing",
            "message": "No \"theme_color\"; the browser cannot tint the title bar to match your app."
        },
        {
            "severity": "info",
            "code": "background_color_missing",
            "message": "No \"background_color\"; the splash screen will use a default background."
        },
        {
            "severity": "info",
            "code": "lang_missing",
            "message": "No \"lang\"; screen readers and translation tools cannot tell the language of \"name\" and \"description\"."
        },
        {
            "severity": "warning",
            "code": "icon_512_missing",
            "message": "No icon of at least 512x512 with purpose \"any\"; Chrome uses it for the splash screen and install dialog."
        },
        {
            "severity": "warning",
            "code": "no_maskable_icon",
            "message": "No icon with purpose \"maskable\"; Android launchers will shrink your icon onto a white circle or square instead of filling the adaptive shape."
        },
        {
            "severity": "info",
            "code": "screenshots_missing",
            "message": "No \"screenshots\"; Chrome shows them in the richer install dialog, which improves installs."
        }
    ],
    "checkedAt": "2026-10-13T18:16:06.181Z"
}
Validate manifest JSON offline — CODE SNIPPETS

curl --location --request POST 'https://zylalabs.com/api/14245/web+app+manifest+checker+api/35364/validate+manifest+json+offline' --header 'Authorization: Bearer YOUR_API_KEY' 

--data-raw '{"manifest":{"name":"My App","short_name":"App","start_url":"/","display":"standalone","icons":[{"src":"/icon-192.png","sizes":"192x192","type":"image/png"}]},"manifestUrl":"https://example.com/manifest.webmanifest"}'

    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Web App Manifest Checker API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.

Starts at
$10,000/Year


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Overview

Give it a page URL and get back a JSON report on that site's Web App Manifest: the manifest is located, fetched and validated, and the result lists coded issues, an overall grade (A+ to F), a score

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