How do we determine if a website uses an API or not? For ex. If I want to scrap a data from particular website to create a Database, should I check that whether that website allows me to scrap data or does that website allow API? How can I check it?
The website owner's wishes should be put in a file called robots.txt. If you use a scraping framework like scrapy, reading and respecting this file is typically built into the framework. If not, you must parse and respect this file manually, which can be some work. Alternatively, read it manually, if you're just scraping a handful of sites.
As an example, check out [https://stackoverflow.com/robots.txt](stackoverflow's robots.txt file).
How do we determine if a website uses an API or not?