Answer by Ifan Iqbal for Obtain a Blogger's blog ID from its friendly URL without screen scraping

Today, the newest blogger API is in version 3.0. With that new API, we can get blog ID with resource type getByUrl. This is full example using my blog and my API:

https://www.googleapis.com/blogger/v3/blogs/byurl?url=http%3A%2F%2Fwww.ifaniqbal.com&key=AIzaSyDNkR52eSfObZi9BPKrTytbowOAM7Js9uY

Just Ctrl+C that example and Ctrl+V to your browser to test that. One of return field of that example is 'id' field, which is the blog ID that we want (in JSON), like this:

{"kind": "blogger#blog","id": "7107469463017369923","name": "Ifan Iqbal","description": "Tips, Download, Resensi, Tutorial, Blog, Blogspot","published": "2012-02-28T23:54:48+07:00","updated": "2013-07-11T16:24:58+07:00","url": "http://www.ifaniqbal.com/","selfLink": "https://www.googleapis.com/blogger/v3/blogs/7107469463017369923","posts": {"totalItems": 161,"selfLink": "https://www.googleapis.com/blogger/v3/blogs/7107469463017369923/posts"},"pages": {"totalItems": 2,"selfLink": "https://www.googleapis.com/blogger/v3/blogs/7107469463017369923/pages"},"locale": {"language": "in","country": "","variant": ""}

}