API Security

What is API?

What is API?

Historial API Evolution

As per the documented history, the occurrence of web APIs transpired towards the end of 1990 with the launch of Salesforce’s sales automation solution. At that point in time, it was an open resource, awarded to everyone.

Salesforce’s automation tool was XML-driven and the format used for interchanging the data for this tool later got acknowledged as standard SOAP API. It featured message format specifications and encoding-specific rules related to allowing or disallowing requests.

Most of the developers need to tackle SOAP for API development and creation. They also need to bring a manual XML document into action, along with RPC. Afterward, developers need to explain endpoints for API and POST the SOAP suite to that end-point. Not only does it account for the birth of API, but it was also the beginning SaaS concept.

It was 2004 when the world witnessed a massive change in APIs course of action with the emergence of platforms like eBay, Amazon, and eBay as they all invested efforts in evolving the APIs. These three platforms change the communication with the web and the surrounding world. The updated API version wasn’t connected to the commercial aspects of a solution. Rather, they started adding value to businesses.

Some of the key events that shaped modern-world API involve the launching of Flicker and Facebook's APIs. Flicker developed a platform to store the digital images over cloud and the platform was developed using APIs that supported image sharing across diverse platforms and integrating photo-sharing facility new services.

By 2008, API was updated to an extent that they can operate on their own and can handle mammoth interconnected information. Twilio showed all of us that an API is all you need to handle the whole product. They launched an API that can connect telephones for calls and texts.

Learning Objectives

What is API?

For beginners, API refers to the Application Programming Interface designed for effortless communication between two different applications.  This is why it’s often referred to as the middle person for the application.  While we discuss API, mentioning API security is essential, as it’s what protects the integrity of the apps, owned and used by the users.

Let’s understand the API meaning in detail. Today’s world is driven by IoT or the Internet of Things (IoT) wherein computing is integrated into day-to-day objects and operations. A real-life example of IoT implementation is using an app that can connect the phone with your refrigerator and allows you to operate from anywhere. Using that app, one can operate the refrigerator remotely, can find out what’s inside it, and even reduce the temperature.   

For developers, API is a great tool to use while exchanging information between microservices and containers and fast-paced communication. Just as integration and interconnectivity are crucial for application development, API drives and enhances application designing.

API Taken the Internet by Storm

APIs were functional as proprietary protocols even before Before the world got to know WWW and the internet. They are playing a crucial part of working wherever distributed networks are used for a restricted area, purpose, or organization. During the pre and post-internet era, APIs served the same purpose and made computing communication possible. 

When Web 2.0 breaks into the world, web-based tools become more than assistance to humans. They acted like lone warriors that could handle all the operations on their own. During this phase, REST rose to fame. It is used to explain API interfaces that are used later to architect the actual applications. 

The credit to offer  REpresentational State Transfer Framework (famously-known as REST) to the world goes to Roy Fielding, who suggested using such a framework in his Ph. D. work in the year 2000. It soon became a norm in the community of development experts and paved the path for OpenAPI

In the times of Web 3.0, APIs are playing a crucial role in communication between IoT and AI-driven devices. The customary request-response paradigm of API had to be modified as event-driven so that APIs involvement becomes more intensified.

api mean

API use cases

APIs are widely used in the world of app and web app development. They are the foundational elements of applications as they allow information exchange effortlessly. Some of the most customary and crucial use cases of API are as under:  

  • Single Page Applications (SPA)

Using the REST API, the development of SPA or Single Page Application is accelerated. SPA apps make website content optimization possible and fits all the content on one page and grants an amazing user experience.

For the development of such applications, predefined CSS, JavaScript, and HTML files are used to begin the web server communication. 

Here, the REST framework is used for server-side communication while a particular kind of framework is deployed for client-side information exchange.

The commonly used REST API framework for SPA development in Jersey. Nancy Fx, Express Js, and ASP.Net Web API. The use of REST API for SPA development promotes improved scaling as it’s a stateless API framework and is not bothered by the use of one or many servers by the client for each request. This reduces the efforts invested to scale the application and eliminates the need of accessing the certain resource.

Other than REST API documentation, nothing binds clients and servers used in SPA development and makes them work as distinct beings. This independence promotes flexible development, testing, and deployment.

On the other hand, if a dynamic web pages framework is used, no such notable freedom is granted to the developers.

  • Public API, enterprise B2B

For a long time, phone calls, fax, and email have served as key communication means for B2B operations. However, the gained technical momentum has promoted the use of integrations IoT-based information exchange. Restful API is playing a crucial role in automating enterprise B2B communication.

From customers’ point of view, releasing public APIs allows businesses to create a consumer-oriented application that makes communication with the outside world attain maximum utility.

The derived sluggishness of B2B processes can be curbed with the use of public APIs as they make business processes de-coupling possible and augment the machine-based interoperability. Public API allows B2B customers to expand the user-based, when the need for this action arises, without increasing the costing burden on the enterprise.

  • Private API, internal API services

Using the private API, B2B customers trim down the time-to-market and launch new applications and tools quickly while causing no bottlenecks for existing workflows. When it comes to managing internal workflow, private APIs make figuring out the areas where there is a need for restructuring and modernization to make the enterprise composable.

The composable business model is an inventive process of breaking the complex functions into miniature pieces for easy handling. It promotes the strategic use of resources. Private APIs support internal communication at every level and make it efficient. 

Collaboration and information exchange becomes swift and secure when done using private APIs.

Internal APIs have made business intelligence analytics more precise as it provides precise details on system parts that might cause operational hindrance and can level up the response time.

  • Service Mesh

It is a component of the infrastructure layer that is highly configurable and is of low latency. It’s used for handling the internal communication that happens at a large scale on the network-based structure. Use of these meshes warrants the swift, secure, and dependable information exchange related to the containerized and ephemeral application.

APIs are used for information exchange in the service mesh. As the data plane of a mesh makes contact with every possible packet or request that goes through the system, things become cumbersome.

The use of APIs like Universal Data Plane and xDS makes the job easier and allows swift operations related to checking system health, monitoring its performance, routing the incoming or outcoming requests, load sharing for balancing the burden of the system, service discovery, and user authorization for preventing malfunctioning. 

  • Mobile Backends

An emerging service delivery model, mobile backend is used commonly for mobile-optimized solution development. Offered as MBaaS or Mobile Backend as a Service, this development model grants freedom to the developers to maintain the servers and server-related tools. An ideal MBaaS platform endows developers with assorted facilities including user management, push notifications, and social login plugins.  

MBaaS sources use flexible SDKs to leverage the endpoint connectivity for API. By doing so, MBaaS makes the development of frontend applications for Android and iOS OS using high-end technology like Flutter, Unity, Iconic, and ReactNative.

The use of MBaaS platform APIs allows developers to promote automation at fronts like workflow management, notification updates, and tasks planning.

Additionally, an inventive API encourages the generation of an application layer that is used for seamless information exchange between various systems and services used. Developers can contrive need-based services for newly added user clusters.

  • IoT (Internet of Things)

IoT is one of the fastest-growing tech today, and is likely to back more than 80% of tools and software in coming times. Development of IoT devices/tools makes seamless with the use of APIs as they offer pre-defined communication routines and protocols for development.  

As IoT devices need to connect to customers or other network users’ devices to complete the information exchange done, using API ensures exposed information is secure, goes to the exact destination and gets along well other peer devices. Developers can create context-based applications competent enough to interact with the outside world without using the UI.

REST API is the most universally used API for IoT devices production and it proffers communication exchange over internet protocols. As IoT is driven by the internet, REST API encourages information exchange over the internet. Additionally, REST API allows developers to implement user authentication and permission-granting strategies.

how api works

API for different folks look really different

In the previous section, we provided a general overview of API to you. It’s usage is so wide and diverse that it works differently for different purposes. 

Back-end developer:

  • Framework: A well-structured plan or strategy that defines how operations and processes will work;
  • Specification: A Swagger-based documentation that describes the functioning of REST or OpenAPI. For example, a document explaining the technicalities of circuit version 3, a clarification on everything related to Geo PC, a GraphQL schema that is different from the default version, or protobuf.
  • Data and Business Logic: It was impossible to imagine operating without HTML markup, but not anymore. Now, we can split data, logic and markup during the development today. Back-end developers prefer separating data and logic between clients (e.g. mobile app or browser). This helps them reuse and repurpose their code or data, e.g. single page applications and mobile apps can use the same data. Similarly, business integration, especially custom integrations, can be handled due to this.
  • Unified mobile, web and integration backends to improve and simplify the synchronization process.


  • Specification meets Production: For example, if an endpoint returns 502 very often, shouldn’t you truy to find the reason and mitigate it? Same has to be done for other issues and needs.
  • Scaling: If an endpoint requires scaling to solve 504 Error, it is essential to find out the responsible microservice, optimal process, and orientation of the problem (e.g., REST API info GraphQL)


  • New protocols: My firewalls, scanners, and other old tools stopped working on upgrading. What to do?!
  • East-west security: The communication within my network is not monitored well?!
  • New API security, networking or other IT compliance

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