Importance of Testing Api

What is the importance of API? an application programming interface (API) is a mechanism that allows two software components to communicate one with another via a set of definitions and protocols.

The word ‘application’ refers to any software with distractive functions while an interface can be regarded as a service contract between two applications. This contract, in particular, states how the two communicate with each other through requests and responses.

How An API Works

An API is a set of clearly defined rules explaining applications or computers communicate between them. APIs are placed between application and web server, taking the role of an intermediary layer in charge of processing the transfer of data between systems.

An application of a client initiates an API call in a bid to retrieve information – also referred to as a request. The request thereof is processed from an application all the way to the web server through the API’s Uniform Resource Identifier (URI) and is inclusive of a request verb, headers, and seldomly, a request body.


After a valid request is received, the API makes a call to either the external program or web server.

Thereafter, the server sends a response to the API along with the requested information.

The API then transfers the requested information (data) to the initial application requesting the same.

The transfer of data differs depending on the web server in use, however, this process of request and response all takes place via an API. While a user interface is designed for utilization by people, APIs on the other hand, are designed for use by either a computer or indeed, an application.

APIs provide design security because their intermediate position facilitates abstraction of functionality between two systems – API endpoints separate consuming applications from service providers.


API calls typically include authorization data to reduce the risk of server attacks, and API gateways can restrict access to mitigate security threats. During the exchange, HTTP headers, cookies, or query string parameters provide an additional layer of security for the data.

For example, put into consideration an API offered by a payment processing service through which customers can enter their card credentials on the front of the e-commerce store application.

The payment processor does not access the user’s bank account; The API creates a unique token for the transaction which is included in the API call to the server. This guarantees a higher level of security against inevitably would-be hacking threats.

Types of APIs

Open API

Open APIs are interfaces for programming open-source applications that can be accessed via the HTTP protocol. They are also referred to as public APIs and they have defined API endpoints as well as request and response formats.

Partner API

Partner API is an application programming interface provided to or by strategic business partners. Developers typically have access to these APIs in self-service mode via the public API developer portal. However, you must complete the provisioning process and obtain credentials to access the partner API.

Internal API

Internal APIs are private application programming interfaces that are hidden from external users. These APIs are unavailable to users outside the company and are designed to enhance productivity and communication between different internal development teams instead.

Composite API

The Composite API combines multiple APIs for data or services. This service allows developers to access multiple endpoints in a single call. Composite APIs are useful in microservices architectures, where the execution of a single task may require information from multiple sources.

The need for APIs

When managing existing tools or developing new ones, the use of application programming interfaces comes in handy as it simplifies the process. The main advantages of the API include the following:

Enhanced collaboration

Mid-sized enterprises use nearly 1,200 cloud applications. Application programming interfaces (APIs) enable integration, allowing these platforms and applications to seamlessly communicate with each other.

Via this integration, companies are able to automate workflows and enhance collaboration in the

workplace. Without APIs, many businesses would undoubtedly lack connectivity and would eventually suffer from information silos that hamper productivity and productivity.

Easier Innovation

APIs provide the much-needed and necessary flexibility that enables companies to connect with other new business partners, provide new products and services to their already existing markets and ultimately access new markets that can generate tremendous profits.

Monetization Of Data

Initially, most companies prefer to offer APIs freely, in order to build a developer audience around their brand and develop relationships. Nevertheless, if the API provides access to a valuable digital asset, it can be used to generate revenue by selling access, in what is known as the API economy.

Extra Security

APIs create an extra layer of security between your data and the server. Developers can further enhance API security by using tokens, signatures, and Transport Layer Security Encryption (TLS); by implementing API gateways for traffic management and authentication; and by practicing effective API management.

API Testing

API testing entails directly testing application interfaces in a bid to determine the expectations regarding functionality, performance, and reliability. The fact that API does not have a GUI means that the test is done at the message level.

Importance Of Testing

The shift to cloud computing has highlighted the importance of application programming interfaces (APIs). With the growth of cloud applications and interconnect platforms, API testing is very essential. Many of the services that are used on a daily basis rely greatly on hundreds of different, interconnected APIs, and in an event that any of them fails, the whole service will not work.


Similar Articles



Most Popular