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API testing tools are more important now than ever. That why I create this list of the top 20 free API Testing Tools you should know.

As we move towards more Agile shift-left software development processes like continuous integration and delivery, the need to quickly give test feedback to our developers is increasing.

One downfall to UI tests is they are slow, making them a poor choice for letting developers know quickly if their code has broken the latest build or not. API tests, on the other hand, tend to be faster and run more reliably than GUI tests.

Below is a quick API testing tools comparison of open source options.

Before we take a closer look at the API testing tools, let’s make sure we’re all on the same page with what an API actually is.

What is an API?

Application Programming Interfaces (API) is a specification that acts as an interface for software components.

While most functional testing involves testing a user interface like a web page or a dot net form, API testing involves bypassing a user interface and communicating directly with an application by making calls to its APIs.

API testing allows you to test headless technologies like JMS HTTP, databases and Web services.

API testing is sometimes called “headless” testing. Most headless testing consists of bypassing the UI and sending a request directly to an application's backend or service and receiving a response while validating the response to ensure things are working as we expect them to.

This simple example is often referred to as a client/server relationship. A client makes a request by asking for a resource; the request then goes out and finds a server that can fill that request. The server locates the desired resource and sends a response back to the client.

What API Testing Tools Can I Use to Automate API Testing?

Since Selenium is just for browser-based testing, you may be wondering which tool to use for Rest and Soap web service-based testing.

Here are some of the top API testing tools that can be used for Rest and Soap Web Service Testing. API tools are great because many times you can leverage one test script to help with API load/stress performance testing, security testing and penetration testing.

So let's get to it.

Although there are a lot of great paid options here are the top free API testing tools you should check out.

Postman

Postman is a rest client that started off as a Chrome browser plugin but recently came out with native versions for both Mac and Windows.

At a high level, you can use it to send a post request to your web server and it gives you the response back. It allows you to set up all the headers and cookies your API expects, and then check the response when it comes back.

Can be used for both automated and exploratory testing
Can be run on Mac, Windows, Linux &Chrome Apps
Has a bunch of integrations like support for Swagger & RAML formats
Has Run, Test, Document and Monitoring Features
Doesn’t require learning a new language

To hear how Postman is used in the real world for testing video games check out Amber Race's TestTalks episode on Testing Video Games Using API Automation.

Karate DSL

Karate allows you to create a test that can sequence calls to any kind of web-service and assert that the responses are as expected.

Build on top of Cucumber-JVM
Can run a test and generate reports like any standard Java project
A test can be written without any Java knowledge required
Tests are easy to write even for non-programmers

Check out a quick example of how to get started using Karate with BDD.

SoapUI

SoapUI is a headless functional testing tool from SmartBear software. It comes in two flavors: Free open source version and Pro Version. Since the free version is open-source, you can actually gain access to the full source code and modify as needed.

The SoapUI Pro version is user-friendlier and has additional functionality including a form editor, an assertion wizard for XPath, and SQL query builder. The free version lets you:

Can easily create custom code using Groovy
Drag and Drop Test Creating
Can create complex scenarios
Asynchronous Testing
SoapUI’s Mock Service lets you mimic web services before they are implemented

Listen to Mike Giller of Smartbear talk more about SoapUI and API Testing.

HttpMaster Express

HttpMaster describes itself as a web development and test tool to automate testing of websites and services. It can be used to test RESTful web services and API applications. HttpMaster also allows you to and monitor API responses.

HttpsMaster project offers global options to customize your API request
Parameter capabilities enable you to include dynamic data with your request
You can use request chaining to leverage request items to include some data from the previous request with the next request

Rest- Assured

Rest-Assured is an open-source Java Domain-specific language (DSL) that makes testing REST service simple. It simplifies things by eliminating the need to use boiler-plate code to test and validate complex responses. It also supports XML and JSON Request/Responses. This is probably the best-known tool to test rest API.

Removes need to create boilerplate code required to interact with a rest service
Support BDD Given/When/Then syntax
Integrated seamlessly with Java projects
Probably the standard for programmatically creating a rest API testing tool script

If you use Java and want a REST API web services library you can use in your framework Rest-Assured is a good choice.

Johan Haleby creator of Rest-Assured shares tips and tricks for getting started REST testing with Rest-Assured.

RestSharp

RestSharp is a simple REST and HTTP API Client for .NET

Supports .NET 3.5+, Silverlight 5, Windows Phone 8, Mono, MonoTouch, Mono for Android
Easy installation using NuGet for most .NET flavors
GET, POST, PUT, PATCH, HEAD, OPTIONS, DELETE supported

Rest Console

HTTP Client and Request Visualizer and Constructor tool, helps developers build, debug and test RESTful APIs. Rest Console is an HTTP Request Visualizer and Constructor tool, helps developers build, debug and test RESTful APIs.

Easy query parameters creation

Syntax highlighting

Authentication support: Plain, Basic, OAuth + Custom

RoboHydra Server

Looking for API integration testing tools?

RoboHydra is a testing tool for HTTP-based clients (ie. software that makes HTTP requests). The idea is, instead of connecting your clients-under-test to the real server, you connect them to RoboHydra and make RoboHydra respond with whatever you need for each request.

You can test many different kinds of clients
Written in Javascript, runs under Node

Hippie-Swagger

hippie-swagger is a tool for testing RESTful APIs. It’s also an API testing tool with automatic swagger assertions. In addition to validating API behavior, it will fail tests when swagger documentation is missing or inaccurate.

Can validate All aspects of swagger file validated; parameters, request/response body, paths, etc.
Accurate, human-readable assertion messages

WebInject

WebInject is an open source solution for automated testing of web applications and web se

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