There is no official API for Google PageRank, but you can estimate it using various tools and libraries such as:
- Using a PageRank checking tool: There are various websites that offer PageRank checking services. You can use these tools by passing the URL of the website as a parameter and the tool will return the PageRank.
- Using a PageRank API: Some websites offer PageRank APIs that can be used to programmatically retrieve the PageRank of a website.
- Implementing PageRank algorithm: You can also implement the PageRank algorithm yourself and calculate the PageRank of a website. The algorithm involves a large matrix computation and requires a lot of processing power.
Please note that Google no longer updates PageRank scores and it is not a reliable metric to measure the importance of a website. Alternative metrics such as Domain Authority (DA) and Page Authority (PA) offered by Moz, Alexa Rank, and the number of backlinks can be used as a substitute.