Popular API Tools and API Metrics

api tools


API metrics are an essential part of API development. They help you understand how your API performs, how often it’s being used, and how much value it provides to its users. Knowing these things can help you improve your API to deliver the best possible user experience. In this article, we’ll cover some popular methods and tools for measuring your APIs performance, as well as discuss which metrics are most valuable when monitoring APIs


A postman is a powerful tool for testing APIs. It allows you to easily make requests, view the responses, and store your API tests in collections. Postman also integrates with many other third-party services like Google Analytics, Mixpanel, Stripe, Twilio, and more.


RapidAPI is a free and easy-to-use API Marketplace that allows developers to discover, test, and publish APIs. RapidAPI provides a complete toolset for anyone who wants to quickly develop, document, prototype, and deploy APIs.

RapidAPI offers various tools, including:

  • A library of pre-defined data sets that can be used in tests
  • Integration with Zapier so you can find new connections between your applications
  • Test environments such as localhost or staging servers
  • Documentation generation tools


If you’re looking for a quick and easy way to test out requests and responses, JSONPlaceholder is a great tool. It allows you to create fake data for use in your project or experiment with different data retrieval methods. You can even upload your pictures!

JSONPlaceholder uses the same structure as its sister site, Placeholder.it, but it’s explicitly optimized for returning JSON data instead of images. This makes it faster than Placeholdit while still offering the same features: custom response sizes and types (e.g., number vs. string), multiple formats (e.g., JSONP), and support for file attachments.

American Public Media Data Services

American Public Media Data Services

API Metrics

Functionality: Currency Conversion

Language: PHP, JavaScript, Python, and Ruby.

How it works: freecurrencyapi.com is an API designed to translate most currencies into another currency. The service also provides historical exchange rates for a given currency pair so users can see how much their money has lost or gained value over time.


You can convert currencies using the free currency API from. The API is easy to implement, and you only need a few lines of code to access the data in your own applications. You can use this API with JSON, XML or plain text responses.


ApiMockupTool is a free and open source API mockup tool that allows you to create mock APIs for testing, prototyping and documentation.

ApiMockupTool lets you create your own mock API by using a web interface or using the API directly via JSON-RPC. You can use ApiMockupTool to build RESTful endpoints that return JSON, XML or CSV data.


Mockoon is a simple REST API mocking tool that allows you to create and preview APIs without writing code. Mockoon is built on top of Express, allowing you to create a mock server to test your APIs. You can also use Mockoon to create a mock client to test your APIs with an easy-to-use command line interface.

Mockoon has the following features:

  • Create mock servers for testing your APIs
  • Create mock clients so that you can send requests and make assertions about the responses (like checking headers)
  • Works with any code base

Katalon Studio

Katalon Studio is a software test automation tool that helps you to build and execute automated tests for your web and mobile applications. It’s open source, so it can be used as freely as you wish. Katalon Studio comes with an easy-to-use interface that allows experienced and novice testers to quickly create compelling test cases by recording actions on the screen or by making them manually using the script editor. You can also import existing scripts from other tools such as Selenium WebDriver, TestNG, JUnit, NUnit, etc., allowing you to reuse existing automation scripts in Katalon Studio without having to rewrite them from scratch.

API Metrics

When we talk about API metrics, we are referring to how well our APIs perform and how effectively they meet the needs of their users. A good API delivers a seamless experience to its users, improves work efficiency, and meets all business needs. To achieve this, APIs must be properly monitored and measured to determine how well it performs. There are a variety of metrics available for measuring your APIs performance. The following are the most common kinds of metrics you’ll need to measure your APIs performance.

Response time: Response time is simply the amount of time (usually measured in milliseconds) it takes for someone’s request to be processed by your server before getting back an answer or error message. The lower response times will reduce wait times for users when interacting with your services; however, if there are high response times spikes, this could have adverse effects on user experience, which may lead to loss of customers or reduced sales figures, etc.


API tools and API metrics are essential to the digital world. They help businesses understand and improve the performance of their APIs, which in turn helps them build better products.

However, with so many different tools available, choosing one for your business can be overwhelming. To help you make an informed decision about which tool is right for you, here’s a list of popular API tools:

  • APIs.io is a tool that allows you to manage your APIs from one place. The main features include:
  • Create new APIs in minutes
  • Manage all aspects of your API lifecycle from design through testing and launch
  • Integrate with cloud services such as Google Cloud Platform (GCP) or AWS Lambda by using pre-built integrations

About Kushal Enugula

I’m a Digital marketing enthusiast with more than 6 years of experience in SEO. I’ve worked with various industries and helped them in achieving top ranking for their focused keywords. The proven results are through quality back-linking and on page factors.

View all posts by Kushal Enugula

Leave a Reply