The Custom Search JSON API helps programmers use programmable search engines in their web applications. It helps them retrieve and display outputs of the search engine using a JSON format.
Here is how to get the Custom Search JSON API key:
Note: You can give it any name you want.
Note: The free version of Custom Search JSON API has a limit of 100 search queries per day. If you require more than this, you can pay $5 per 1,000 queries for up to 10,000 queries a day. You can sign up for billing using the API console. If you want to search 10 or fewer specific websites with unlimited queries, check out the Custom Search Site Restricted JSON API.
Free Resources