20 API related terms hassam me

20 API-related terms every web developer should be aware of 😱

API related terms every web developer should be aware of.

credit: @Rapid_API


An endpoint is nothing but the location(URL) where the actual resource is present.

Origin Server

The origin server is the actual server that contains the data and servers on the client’s request.

There may or may not be other intermediate servers included in the path.

Proxy Server

Servers have the ability to further pass your request to the other server.

These types of intermediate servers are known as proxy servers.

DNS Server

DNS stands for Domain Name System.

As computer devices are interacted using IP addresses, the DNS server provides the IP address of the requested URL.

API key

An API key is a unique code for every user which lets you call an API.

The length of an API key could be anything.

The only rule is that these keys must be unique and not easy to guess.

Generally, API keys contain lower case and upper case letters with numbers.

Access token

An access token is used for authentication.

Applications use an access token to authenticate themselves so that they can make an API call.


SDK stands for Software Development Kit.

It is a set of development tools that allows the creation of software or an application for a particular platform.

SDK provides you with the whole package from compilers to debuggers to even a software development framework.


Remote Procedure Call (RPC) is the oldest client-server communication method in use today. Instead of the traditional HTTP call, RPC uses a function call.

It means that on the client-side, you invoke a function that is written on the server-side code.


CORS is an HTTP-based mechanism that lets you request data from one URL to a different URL.

Async API

AsyncAPI is an open-source project aimed at improving the current state of Event-Driven Architecture.

These APIs allow relatively time-consuming requests to be processed in the background while other requests are made.

Internal API

Internal API, also known as Private API is only accessible to the developers within an organization.

API Caching

API Caching is the ability to store copies of frequently accessed data in several places along the request-response path.

External API

External API, also known as Public API is accessible to all the developers outside the enterprise or organization.

HTTP cookies

An HTTP cookie is a small piece of data created by the web server inside your browser.

The data inside a cookie has an ID that is unique to you and your computer. This ID helps the server know who the user is to send the data accordingly.


Authorization always comes after authentication. It is the process of permitting users to access different resources from the server, and it’s not visible and changeable by the user.


A microservice is an application design that breaks up a monolithic architecture into small, self-containing services.

OpenAPI spec

It is a format to define structure and syntax for REST APIs. It provides a standard that allows both humans and computers to discover and understand the service’s capabilities without access to source code, documentation, or traffic inspection.

Composite API

Composite API is a design approach in which we bundle multiple API requests into a single API call.

API Versioning

API versioning is the practice of managing changes in your API.
You should version your API if you are introducing any breaking changes. Clients can still access the old version, and their products will not break as soon as you launch a new release.


Authentication is validating the user to identify if they are who they claim to be.

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