What is a REST API?
A REST API is a web API in which each resource, such as an order, has its own URL and is read or changed with standard HTTP methods. REST, short for representational state transfer, was described by Roy Fielding in his 2000 doctoral dissertation.
Also called: RESTful API
Why it matters
Many services you are likely to connect, from the Kaspi seller API to Bitrix24 and amoCRM, work over REST, so this is how your systems will usually talk. Because REST runs over plain HTTP, usually with JSON, almost any programming language can call it. That keeps you free to change technology later.
1MethodsGET reads, POST creates, PUT or PATCH updates, and DELETE removes a resource.
2StatelessEach request carries everything the server needs, including credentials, which keeps servers simple to scale.
3Any languageDevelopers build REST APIs with FastAPI in Python, Express in Node.js, Spring in Java and many others.
ExampleA booking app for a fitness club in Karaganda needs member data from the club’s management system. Its REST API gives members and bookings their own URLs: the app sends GET requests to list classes and POST requests to book one. Each call carries an access token.
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