An API, or application programming interface, is a set of rules that define how applications or devices can connect to and communicate with each other. A REST API is an API that conforms to the design principles of the REST, or representational state transfer architectural style. For this reason, REST APIs are sometimes referred to RESTful APIs.
First defined in 2000 by computer scientist Dr. Roy Fielding in his doctoral dissertation, REST provides a relatively high level of flexibility and freedom for developers. This flexibility is just one reason why REST APIs have emerged as a common method for connecting components and applications in a microservices architecture.
At the most basic level, an API is a mechanism that enables an application or service to access a resource within another application or service. The application or service doing the accessing is called the client, and the application or service containing the resource is called the server.
Some APIs, such as SOAP or XML-RPC, impose a strict framework on developers. But REST APIs can be developed using virtually any programming language and support a variety of data formats. The only requirement is that they align to the following six REST design principles - also known as architectural constraints:
REST APIs communicate via HTTP requests to perform standard database functions like creating, reading, updating, and deleting records (also known as CRUD) within a resource. For example, a REST API would use a GET request to retrieve a record, a POST request to create one, a PUT request to update a record, and a DELETE request to delete one. All HTTP methods can be used in API calls. A well-designed REST API is similar to a website running in a web browser with built-in HTTP functionality.
Request headers and parameters are also important in REST API calls because they include important identifier information such as metadata, authorizations, uniform resource identifiers (URIs), caching, cookies and more. Request headers and response headers, along with conventional HTTP status codes, are used within well-designed REST APIs.
Although flexibility is a big advantage of REST API design, that same flexibility makes it easy to design an API that’s broken or performs poorly. For this reason, professional developers share best practices in REST API specifications.
The OpenAPI Specification (OAS) establishes an interface for describing an API in a way that allows any developer or application to discover it and fully understand its parameters and capabilities - available endpoints, allowed operations on each endpoint, operation parameters, authentication methods, and other information. The latest version, OAS3 (link resides outside ibm.com), includes with hands-on tools, such as the OpenAPI Generator, for generating API clients and server stubs in different programming languages.
Securing a REST API also starts with industry best practices, such as using hashing algorithms for password security and HTTPS for secure data transmission. An authorization framework like OAuth 2.0 (link resides outside ibm.com) can help limit the privileges of third-party applications. Using a timestamp in the HTTP header, an API can also reject any request that arrives after a certain time period. Parameter validation and JSON Web Tokens are other ways to ensure that only authorized clients can access the API.
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