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Although we often hear API, I think it is one of the most difficult terms to understand. This time, we explained API so that you can understand it even if you have no prior knowledge. In the first half, you will learn the knowledge side, and in the second half, you will actually create it, so you can get an idea of what an API is and what it means to develop an API. 00:00 Introduction to WebAPI 04:17 What is an API? 20:02 How do you create a WebAPI? 31:44 Let's create it by hand The source code used this time is posted here. https://github.com/kiyodori/express_a... ■Programming learning service to become a self-study engineer https://dokugaku-engineer.com/ ■Introductory courses on AWS and Git are on sale on Udemy https://linktr.ee/yamaura ■Profile Kiyoto Yamaura Web engineer Born in 1987 in Fukuoka Prefecture. Graduated from Kyoto University Graduate School. In 2014, he switched from inexperienced experience to engineering, and experienced the operation of existing services and the launch of new businesses. He shares engineering knowledge that can be used in development sites based on his experience of struggling to master programming. There are 60,000 Udemy students.