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5 Best API Testing Tools for Building Functional, Secure Applications

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Narola Infotech
5 Best API Testing Tools for Building Functional, Secure Applications

Software development is constantly changing, and APIs (Application Programming Interfaces) are the key to seamless communication and data exchange between applications and services. APIs become more complex, necessitating rigorous testing to ensure functionality, security, and performance. API testing is now essential to the software development lifecycle, ensuring that APIs meet modern application needs and provide a great user experience.


Understanding API Testing Types

API testing includes many test types that cover API functionality and performance. This includes:


1. Functional Tests

Functional testing verifies that API endpoints respond correctly to input parameters and scenarios. It ensures API functionality.


2. Performance Tests

Performance testing checks the API's responsiveness and capacity to handle high request volumes. For the API to scale to real-world demands, this is essential.


Third, security testing

Security testing assesses API resilience to vulnerabilities and unauthorized access. It is essential for data security and system integrity.


4. Compatibility Test

API compatibility testing ensures smooth operation across platforms, devices, and operating systems. This is crucial for user consistency.


5: Documentation Testing

Documentation testing confirms that API documentation matches API behavior and usage. Developers integrating the API need clear documentation.


Now that we know the types of API testing, let's talk about the best tools.


The 5 Best API Testing Tools for Great Development

After careful consideration, we've selected the top 5 API testing tools that will transform your development process.


1. ReadyAPI

First version released in 2014; third version released in 2019.

SmartBear Developer Windows, macOS, Linux Supported Platforms

Key ReadyAPI Features:


No-code testing: ReadyAPI's simple interface lets users create, manage, and run automated tests without coding.

ReadyAPI allows end-to-end API testing for functionality, security, and performance.

Data-driven testing: ReadyAPI lets you use external data to drive test cases and improve coverage.

ReadyAPI's virtualization capabilities allow simulated API environments for testing without disrupting development workflows.

Use Cases for ReadyAPI Testing:


PayPal: Uses ReadyAPI to secure, scale, and perform its vast API network.

Adobe uses ReadyAPI to accelerate API testing and software delivery, ensuring product integration across Adobe's diverse portfolio.

Toyota uses ReadyAPI to improve API development and testing.


2. Katalon Studio

Established 2016 Developer: Katalon Corporation

Web, API, Mobile (Android and iOS), Desktop (Windows and macOS)

Uses Katalon Studio Cases:


Booking.com automates testing across its web, mobile, and API apps with Katalon Studio to maintain user experience.


FPT Software: Uses Katalon Studio to speed up software testing and delivery, reducing new software time to market.

Siemens uses Katalon Studio to improve software development and testing quality and efficiency, supporting data-driven real-world testing.


3. Mailman

Founded: 2012

Developed by Abhinav Asthana

Windows, macOS, Linux.

Key Postman Features:


Developers can define API requests, responses, and data models with ease.

API testing: Comprehensively tests API functionality, security, and performance.

Creates mock API servers for testing and debugging without production environments.

Generates well-structured API documentation for easy access to specifications and usage guidelines.

Collaboration platform: Allows API teams to share, comment, and version API definitions and test scripts.


Using Postman Cases:

Netflix: Manages and tests its vast API network with Postman to ensure API-driven service performance and reliability.

Postman helps GitHub detect and fix API issues early in the development cycle.

Uber uses Postman to accelerate API development and testing, ensuring high availability and new feature delivery.

Google Apigee, founded in 2010, was acquired by Google in 2016.

Windows, macOS, Linux.

Key Apigee Features:


An API proxy layer controls manages, and secures API traffic between backend services and clients.

Controls API traffic, including throttling, routing, and load balancing.

Secures APIs with authentication, authorization, and encryption.


Monitoring: Diagnoses API issues by monitoring performance and usage.

The developer portal lets developers discover, document, and use APIs.

Used Apigee Cases:


Coca-Cola: Uses Apigee to expose backend services to external developers for brand and product integration.

Weather.com: Uses Apigee to manage its extensive API network for weather data and forecasts.

eBay: Uses Apigee to secure and reliably integrate its APIs with the e-commerce platform for developers.


5. Apache JMeter

Established 1998; updated 22-01-2021 to 5.4.1.

Developer: Apache Software Foundation

Any JVM-enabled environment: Windows, Linux, Mac

Apache JMeter Use Cases:


Google Search, Gmail, and YouTube are load-tested with Apache JMeter.

Amazon: Performance tests Amazon.com with Apache JMeter.

Microsoft uses Apache JMeter for Azure scalability testing.

Selecting an API Testing Tool

A reliable API testing tool is essential for any business that wants to ensure API quality and reliability. The right tool can find and fix bugs early, prevent security vulnerabilities, and ensure API performance, improving user experience and developer reputation.


While the best tool depends on needs and budget, the tools discussed


Also Read This:


5 Best Mobile App Testing Tools

Overcoming Common Challenges in Automation Testing: Tips and Solutions

The Ultimate Guide to Software Automation Testing: Strategies, Tools, & Best Practices






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