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What’s API Testing? And Top 10 API Testing Tools In 2020

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What’s API Testing? And Top 10 API Testing Tools In 2020

API Testing

API testing is used to determine whether API’s can provide a correct response to requests. From edge cases to reacting openly, learning from failures and unexpected inputs as well as getting out responses on time, this works to prevent possible security threats.

Jmeter

The JMeter application is an open source software that is a Java application designed to test functional behavior and measure performance. Probably this tool is best selection for load tests. Very easy to prepare tests. Although originally created for load testing, it is widely used for functional API testing.Also interface is very simple and easy to understand.

Jmeter includes many features: It has the ability to install and performance test many different application / server / protocol types such as HTTP, HTTPS, SOAP/REST Webservices, FTP, JDBC, LDAP, POP3, IMAP,TCP. Provides coding support for Java (BeanShell) and Groovy. Values can be written and read to/from variables. We can validate with JSON, XML, HTML and we can use Jira APIs. We can offline analysis/replaying of test results. We can run Jmeter projects with Maven, Gradle and Jenkins. Totally Free Pricing.

Postman

Postman is platform for API development. It can be a good choice for API testing for those who don’t want much coding.

Postman includes many features: It has the ability to install and performance test many different application / server / protocol types such as HTTP(S)/REST, SOAP, GraphQL.

Provides coding support with Javascript in tests. Values can be written and read to/from variables. We can create the variables with 3 different ways. Collection variable, Global environment variable, a specific environment variable. We can validate Json datas with Javascript code. We can validate XML datas with Javascript code. But firstly we must translate that to JSON. node.js and newman must be downloaded for run it on command prompt then we should export our collection as json with that we can run our collection on jenkins. We can use Jira APIs. This can be an alternative of SoapUI Pro. But properties, interface and ease of use are not advanced much as SoapUI Pro. We can enable some properties with pro versions (Pricing: Free, $12, $24).

SoapUI Open Source

SoapUI has very advanced variable(properties) managing. If necessary we can create them as environment property. On SoapUI all variables are assumed a property and we can also get properties(name, description …) as a variable. We can manage the variables for all layers.(step, case, suit, project, global). SoapUI Open Source include scriptless functional testing, security testing, load testing ,API features. It has the ability to install and performance test many different application / server / protocol types such as HTTP(S)/ REST, SOAP/WSDL, MQTT, AMF, JDBC, JMS. It provides coding support with Groovy (Groovy Script). We can validate with Json path expression. We can validate with Xpaths. The jenkins plugin is can’t be used. We can get Windows command from TestRunner. With that command we can run our project on Jenkins. We can use Jira APIs. We can create security test cases with an interface very easily.

Test types: Boundary Scan, Cross Site Scripting, Fuzzing Scan, Invalid Types, SQL Injection, Xpath Injection.

SoapUI Pro (ReadyApi)

ReadyAPI provides API testing solution to create, run, and analyze complex validation. SoapUI has very advanced variable(properties) managing. If necessary we can create them as environment property. On SoapUI all variables are assumed a property and we can also get properties(name, description …) as a variable. We can manage the variables for all layers.(step, case, suit, project, global). It has the ability to install and performance test many different application / server / protocol types such as HTTP(S)/ REST, SOAP, MQTT, AMF, JDBC, GraphQL Query. It provides coding support with Groovy (Groovy Script). Excel, JSON, XML, JDBC, File, Database are supported. Also we can create a data generator on SoapIU interface. We can export the results as xml, csv, json, html also as printable file : excel(multi sheet-single sheet), pdf, odt, xml, html, csv, rtf. SoapUI Pro has very usable report customize interface. We can validate with Json path expression. Very easy to use. We can validate XML responses with Xpath. Very easy to use. SoapUI Pro has Jenkins plugin also Jenkins has SoapUI plugin. We can set it very easily. We can manage Jira from SoapUI interface. We can create security test cases with an interface very easily.

Test types: Boundary Scan, Cross Site Scripting, Fuzzing Scan, Invalid Types, SQL Injection, Xpath Injection, HTTP Method Fuzzing, Sensitive Files Exposure, Weak Authentication. Most professional tool for api testing. Also SoapUI Pro has very useful plugins for different tools. If we will make load tests and if we need virtual services we can buy another 2 tools.(LoadUI Pro and Service V Pro) LoadUI has free version.

Gatling FrontLine (Enterprice)

Gatling Frontline has very advanced result display web dashboard. We can use web dashboard and Grafana. Also we can compare the results each other and we can see the graphs for different analysis. We are creating tests totally with coding therefore we can manage variables very easily. It has the ability to install and performance test many different application / server / protocol types such as HTTP(S)/REST, JMS, MQTT. It provides coding support with Scala. We developing the tests with an IDE therefore we can add breakpoints. We can validate with JsonPath and JMesPath. We can validate XML responses with Xpath.

There is a plugin for jenkins integration : Keep track of a Gatling simulation, providing performance trends across builds and publish detailed reports for each build. We can use Jira APIs. We have to prepare the tests manually. Gatling is more different from other tools. It has an interface for recording except that everything is done with coding(Scala) but not required advanced Scala knowledge. This can make things a little difficult but also providing flexibility.

Katalon

Katalon Studio is very advanced tool. We can test all platforms with that. But it has some weaknesses on api testing side. e.g : We can’t add threads for performance testing, if xml response has namespaces there is a problem to get values from response. Also it is very big a missing we can’t run katalon projects from command prompt without Katalon Runtime Engine. It provides coding support with Groovy. We can create the variables on different layers : methods, test cases or profiles (profiles are like environments on Postman). We can manage the variables as locally or globally. Excel, Csv, Database, Internal Data are supported. “Internal Data” is like “Data Generator” on SoapUI.

K6

This Tool is not documented very properly , so it was difficult to figure out how to use it because there are no much resources about it .

It is possible to use and make tests on JENKINS , there is no Plugin to use it but on Command Prompt we can make our tests.

We are creating tests totally with coding therefore we can manage variables very easily.

k6 is a developer centric open source load and performance regression testing tool for testing the performance of your cloud native backend infrastructure: APIs, microservices, serverless, containers and websites.

Citrus framework

Citrus effectively composes complex messaging use cases with response generation, error simulation, database interaction and more. Integration testing can be very hard, especially when there is no sufficient tool support. Unit testing is flavored with fantastic tools and APIs like JUnit, TestNG, EasyMock, Mockito and so on. These tools support you in writing automated tests. A tester who is in charge of integration testing may lack of tool support for automated testing especially when it comes to simulate messaging interfaces. With powerful validation capabilities for various message formats like XML, CSV or JSON Citrus is designed to provide fully automated integration tests for end-to-end use cases.

Citrus framework supports JUnit reports , also we can create HTML reports too.

We are creating tests totally with coding therefore we can manage variables very easily.

In Jenkins there is no any Plugin for Citrus but we can run our project with command line on Jenkins .

Karate

Karate is the only open-source tool to combine API test-automation, mocksperformance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Powerful JSON & XML assertions are built-in, and you can run tests in parallel for speed .

It ıs possible to use and make tests on JENKINS using Java Eclipse and Apache Maven.

We are creating tests with coding therefore we can manage variables very easily.

Built-in test-reports compatible with Cucumber so that you have the option of using third-party (open-source) maven-plugins for even better-looking reports

Rest assured

REST-assured provides a lot of nice features, such as DSL-like syntax, XPath-Validation, Specification Reuse, easy file uploads and with those features we will handle automated API testing much easier.
Rest Assured has a gherkin type syntax If you are a fan of BDD (Behavior Driven Development), I believe that you will love this kind of syntax and It has all the useful library and feature which enhances the API functional testing.

We are creating tests totally with coding therefore we can manage variables very easily.

It ıs possible to use and make tests on JENKINS using Java Eclipse and Apache Maven.

This library can be used along with JUnit or TestNG testing framework to enhance test case maintainability and reporting.

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