{
"url": "https://github.com/",
"finalUrl": "https://github.com/",
"statusCode": 200,
"cached": true,
"checkedAt": "2026-10-18T13:53:53.789Z",
"note": "Only meta tags present in the served HTML are read (no JavaScript rendering). Platforms cache link previews on their side; this report does not refresh them.",
"found": true,
"grade": "A+",
"score": 99,
"summary": {
"errors": 0,
"warnings": 0,
"infos": 1
},
"preview": {
"title": "GitHub · Change is constant. GitHub keeps you ahead. · GitHub",
"description": "Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.",
"image": "https://images.ctfassets.net/8aevphvgewt8/4pe4eOtUJ0ARpZRE4fNekf/f52b1f9c52f059a33170229883731ed0/GH-Homepage-Universe-img.png",
"url": "https://github.com/",
"siteName": "GitHub",
"type": "object",
"twitterCard": "summary_large_image",
"locale": "en"
},
"tags": {
"openGraph": {
"og:image": "https://images.ctfassets.net/8aevphvgewt8/4pe4eOtUJ0ARpZRE4fNekf/f52b1f9c52f059a33170229883731ed0/GH-Homepage-Universe-img.png",
"og:image:alt": "Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.",
"og:site_name": "GitHub",
"og:type": "object",
"og:title": "GitHub · Change is constant. GitHub keeps you ahead. · GitHub",
"og:url": "https://github.com/",
"og:description": "Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity."
},
"twitter": {
"twitter:image": "https://images.ctfassets.net/8aevphvgewt8/4pe4eOtUJ0ARpZRE4fNekf/f52b1f9c52f059a33170229883731ed0/GH-Homepage-Universe-img.png",
"twitter:site": "@github",
"twitter:card": "summary_large_image",
"twitter:title": "GitHub · Change is constant. GitHub keeps you ahead. · GitHub",
"twitter:description": "Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity."
},
"article": [],
"canonical": "https://github.com/",
"title": "GitHub · Change is constant. GitHub keeps you ahead. · GitHub · GitHub"
},
"imageCheck": {
"url": "https://images.ctfassets.net/8aevphvgewt8/4pe4eOtUJ0ARpZRE4fNekf/f52b1f9c52f059a33170229883731ed0/GH-Homepage-Universe-img.png",
"status": 206,
"contentType": "image/png",
"sizeBytes": 618778,
"error": null
},
"issues": [
{
"severity": "info",
"code": "og_image_size_missing",
"message": "og:image:width / og:image:height are not set; scrapers must download the image first, so the first share can render without it."
}
]
}
curl --location --request GET 'https://zylalabs.com/api/14327/open+graph+twitter+card+validator+api/35914/validate+the+open+graph+and+twitter+card+tags+of+a+url' --header 'Authorization: Bearer YOUR_API_KEY'
{
"found": true,
"grade": "F",
"score": 56,
"summary": {
"errors": 0,
"warnings": 4,
"infos": 4
},
"preview": {
"title": "Hi",
"description": null,
"image": "https://example.com/a.png",
"url": "https://example.com/page",
"siteName": null,
"type": null,
"twitterCard": null,
"locale": null
},
"tags": {
"openGraph": {
"og:title": "Hi",
"og:image": "https://example.com/a.png"
},
"twitter": [],
"article": [],
"canonical": null,
"title": "Hi"
},
"assumptions": {
"url": "https://example.com/page",
"note": "Validated offline: the og:image file is not requested."
},
"issues": [
{
"severity": "warning",
"code": "og_type_missing",
"message": "No <meta property=\"og:type\"> (usually \"website\" or \"article\"). The Open Graph protocol lists it as required."
},
{
"severity": "warning",
"code": "og_url_missing",
"message": "No <meta property=\"og:url\">. Platforms then guess the canonical address of the page."
},
{
"severity": "warning",
"code": "og_description_missing",
"message": "No <meta property=\"og:description\">; link cards show no description text or a random page snippet."
},
{
"severity": "info",
"code": "og_site_name_missing",
"message": "No og:site_name; some platforms show it above the title."
},
{
"severity": "info",
"code": "og_image_size_missing",
"message": "og:image:width / og:image:height are not set; scrapers must download the image first, so the first share can render without it."
},
{
"severity": "info",
"code": "image_alt_missing",
"message": "No og:image:alt or twitter:image:alt text for the preview image."
},
{
"severity": "warning",
"code": "twitter_card_missing",
"message": "No <meta name=\"twitter:card\">. X may not render a card without it, even if Open Graph tags exist."
},
{
"severity": "info",
"code": "meta_description_missing",
"message": "No <meta name=\"description\">; used by search engines and as a fallback on some platforms."
}
],
"checkedAt": "2026-10-18T14:01:58.682Z"
}
curl --location --request POST 'https://zylalabs.com/api/14327/open+graph+twitter+card+validator+api/35915/validate+html+you+send+in' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"html":"Hi ","url":"https://example.com/page"}'
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 Open Graph Twitter Card Validator 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.
Required and recommended Open Graph and Twitter Card tags, value lengths, canonical mismatch and whether the og image is reachable. It returns a grade, a score and coded issues.
Yes. The validate endpoint accepts HTML in the request body and checks it offline without any outbound request, except an optional image check.
Yes. A bare domain such as example.com is treated as https. Parameter aliases such as u, link, target and site are accepted as well.
Set the probe parameter to 0. The image is then not requested and only the tags are checked.
Gate on the errors count in the summary. A single error lowers the score to 75, so the letter grade alone is not a reliable pass or fail signal.
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