Custom Search

Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites. You can configure your engine to search both web pages and images. You can fine-tune the ranking, add your own promotions and customize the look and feel of the search results. You can monetize the search by connecting your engine to your Google AdSense account.

Google Custom Search Engine API is a RESTful API that allows developer to get web or image search results data in JSON or Atom format. 
The Custom Search Control API lets you embed Google Custom Search element in your web pages and other web applications using JavaScript.
The JSON/Atom API lets you develop websites and programs to retrieve and display search results from Google Custom Search programmatically. With this API, you can use RESTful requests to get search results in either JSON or Atom format.

Features of Google Custom Search API

• Create custom search engines that search across a specified collection of sites or pages
• Enable image search for your site
• Customize the look and feel of search results, including adding search-as-you-type autocompletions
• Add promotions to your search results
• Leverage structured data on your site to customize search results
• Associate your search engine with your Google AdSense account, so you make money whenever users click ads on your search results pages.