Most often we'd like to know the size or creation date of public repositories out of curiosity before cloning or forking. Knowing the size will come in handy when we decide to pull a repository, if it's huge we can just download the desired files or browse on GitHub itself.
I agree there are plenty of browser extensions to the rescue. GitHub Repository Size & Github - Date of creation to name a few. The downside is all those are browser specific, in the sense you've to install different plugins for different browser.
Those consume system memory and it may slow down the browser start up time. The solution must be browser independent. Also, you won't need the details of every single repository you come across.
You can use a bookmarklet for this purpose. Just drag and drop the following button to your bookmarks bar.
Now whenever you want to know the details of any repository, when it is open in the current tab of browser, just click the bookmark on the bookmarks bar. It'll display both the size and creation date of that repository. Just press
ESC key or
Enter key or press
OK button to hide the alert.
If you don't find the bookmarks bar on your browser,
Chrome - Click on top right corner three dot menu → Bookmarks → Show bookmarks bar.
Firefox - Right click top right corner hamburger menu → Bookmarks Toolbar.
Not working on Firefox
Sometimes due to a bug on Firefox, this bookmarklet won't work. In that case go to
about:config and search for
security.csp.enable and set it to
false (simply you can double click the appropriate row).
Private & Organization Repositories
Without any changes you can use this bookmarklet for any public repositories, but to make it work for private or private organization repositories, you've to do some extra work. Because not all people are authorized to view private repository details using GitHub APIs.
Just go to GitHub tokens page, click
Generate new token, give it a name, check
repo and then scroll down and select
The page will display a token, you have to copy the token. Now right click the bookmarklet and select Edit (on Firefox Properties), copy the whole URL (on Firefox Location) section, Paste it in a text editor of your choice. Replace
fd150cbeb964b8efe662c1883605517387679d20 with the token you copied from GitHub.
Now copy the whole text and paste it back in the URL section of the bookmarklet and save. After this step, you'll be able to get the details of private repositories too.
How it works
You can replace first git with a username or organization name and second git with the repository name to get custom result. If that repository is a private or private organization one, you have to append the URL with
?access_key=<YOUR ACCESS KEY>. Source code of the bookmarklet - GitHub Repository Size and Creation Date bookmarklet.