{
"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."
}
]
}
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'
{
"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"
}
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"}'
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.
| 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.
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
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund