The most important heading in body document is.
If website doesn’t contain meta title tag or og:title tag, we can consider a heading in document’s body as main title. What data should we preview in this case? There are a lot of websites without basic meta tags and og tags.
Codekit preview url how to#
How to get data without meta and og tags? URL provided is not shown on Facebook newsfeed, only domain is visible.Ī complete list of og tags available can be found on the Open Graph website. This tag defines the canonical URL for your page.
Recommended resolution is 1200 pixels x 627 pixels (1.91/1 ratio) and image size shouldn’t exceed 5MB. You can define image with og:image title. Open Graph ImageĪn image is probably the most eye-catching element in link preview. In this case, you should use around 200 letters. If a social network robot cannot find og:description tag, it uses meta description and there is no limit on numbers of characters. Similar rules applies to this tag as for title tag. This is where you describe website’s content. This tag is again similar to meta tag description. For example Facebook will truncate it to 88 characters. Otherwise, it can be shortened or truncated. There is no limit on number of characters, but the title should be between 60-90 characters as meta title. This tag is very important, because is usually shown in bold. If Facebook doesn’t find the og:title tag, it uses the meta instead. The following Open Graph tags are used for creating link previews: Open Graph Title You can find more information on Twitter documentation. When the Twitter card processor looks for tags on a page, it first checks for the Twitter-specific property, and if not present, falls back to the supported Open Graph property.
They are based on the same conventions as the Open Graph protocol. However, Twitter created own tags for Twitter Cards, which are called Twitter card tags. Other social networks take into account Open Graph Protocol as well. If websites want to use Open Graph Protocol, they need to have Open Graph meta tags in the part of the website’s code. With that being said, Open Graph Protocol allows to control what information is used when a website is shared. The main purpose is easier integration between Facebook and other websites. For more details check Bonus Tips.įacebook launched Open Graph protocol in 2010, which is now managed by the Open Web Foundation. You can create link previews even more rich by providing other information. What should be included in a link preview?Ī preview of url link usually contains the title, a description, the domain name and an image. Hope, this article will save you a lot of time figuring out how to build this feature with open-source libraries in any back-end language. If I found a solution which worked, it relied on some paid third-party APIs. When I needed to create preview link feature, I found a lot of misleading or outdated information on this topic. I am going to describe the whole strategy of creating link previews, including implementation using open-source libraries in node.js. In this blog post, I want to share with you, how to create a link preview feature without third-party APIs. Nowadays, we can see link preview feature in almost every social network or chat application, where users can send or share url links.
Codekit preview url code#
You can check the source code on Github and deployed demo on Heroku. I released this solution as npm packaged.
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