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12 Best REST API Testing Tools in 2021

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  • Last Updated : 14 Feb, 2022

Representational State Transfer (REST) has become the de-facto standard for creating web services. This highlights the importance of RESTful web service in developing complex web and mobile applications. RESTful web services are lightweight, maintainable, and scalable web services based on REST architecture. It is important to make use of advanced tools that interact with RESTful web services so that we can check whether the API returns correct output under different conditions. In this feature, we will discuss different tools to interact with RESTful Web Services. 

  • Curl
  • HTTPie
  • Postman REST Client
  • Stoplight
  • Swagger
  • Soap UI
  • Pyresttest
  • Katalon
  • Karate DSL
  • iCurlHTTP app
  • HTTP request app



Curl is an open-source command-line tool to transfer data from or to a server. With curl, you can easily compose and send HTTP requests and analyze their responses. One of the advantages of using cURL is that you can build a script with batch requests and execute them. You can either use curl from a command prompt or  Cygwin package installation. You can also use the windows power shell with curl, but you have to remove the curl alias.

To work with the curl command in the command prompt, you have to download the latest curl and include the folder that has the curl.exe file.



HTTPie is a command-line HTTP client written in Python. It uses a syntax that is easier than cURL, colorizes the output, and uses multiple lines to display the output. The disadvantage is that it takes more time to load than cURL. Some of its key features are:

  • Built-in JSON support
  • Colorized and formatted terminal output
  • Sensible defaults
  • Persistent sessions
  • HTTPS, proxies, and authentication support

You can use the below command to install HTTPie

pip3 install –upgrade httpie

Postman REST Client

Postman Web Version

Postman REST client is a Graphical User Interface (GUI) tool that facilitates composing and sending HTTP requests to a development server. You can either use the web version or the postman app. Some of its major features are:

  • Create and execute complex REST requests
  • Can import a collection directly rather than creating calls manually
  • Display the status code, response type, and response size
  • Easy to inspect the response body
  • Powerful and simple visualization
  • Make requests to different environment variables
  • Supports multiple protocols, manage cookies and manage certificate



The stoplight is a GUI tool that helps you to build complex APIs. It provides an HTTP request maker to compose and send HTTP requests and generates the code for different programming languages. It can design, document, and build quality APIs faster. Some of its key features are:

  • It provides a quality visual  API design with JSON schema designer support
  • Ensure consistency and quality with style guides
  • Automatic Mock servers
  • Avoids duplication by reusing components
  • Git workflow collaboration


Image from Swagger

Swagger is an open-source tool built for API design, development, and testing, API mocking and virtualization, and API governance and monitoring. The Swagger OpenAPI specification creates a RESTful interface for developing and consuming an API. It efficaciously maps all the resources and operations associated with it. Some of the major Swagger tools are:

  • Swagger Codegen: Generate server stubs and client SDKs from OpenAPI Specification definitions
  • Swagger Editor: API editor for designing APIs with the OpenAPI Specification
  • Swagger UI: Visualize OpenAPI Specification definitions in an interactive UI

Soap UI 

Image from Soap UI

Soap UI is an open-source tool to build and test APIs, which facilitates validating REST and SOAP-based web services. Some of the Soap UI open-source features are:

  • Scriptless functional testing: It provides a drag and drops test creation facility
  • Security Testing: The tests and scans protect the web services from common security vulnerabilities
  • Load Testing: It creates a load test based on an existing functional API test.
  • API mocking: Don’t need to build expensive full-scale replicas of your production system, can easily mimic real web services.
  • Protocol support: Provides protocol support to SOAP/WSDL, REST, and JMS


Pyresttest is a Python-based tool for REST testing and API micro benchmarking tool. Some of its highlights are:

  • No coding required – Its tests are defined in basic YAML or JSON config files.
  • It supports generating, extracts, or validating mechanisms to create full test scenarios
  • Return exit codes on failure and supplies parseable logs
  • Minimal dependencies.

Use the below command to install Pyresttest.

pip install pyresttest


Image from

Katalon is an automation tool for composing and sending HTTP requests to a development server. It includes all frameworks, ALM integrations, and plugins in one package. Some of its key features are:

  • Productive IDE for API automation
  • Supports all types of REST and SOAP requests
  • Test requests can be imported from Swagger, Postman, and WSDL.
  • Built to work with modern frameworks.
  • Local and remote execution with real-time analysis.
  • Data-driven request composing made simple with multiple data sources (e.g. XLS, CSV)
  • Sustainable and Scalable platform
  • Minimal maintenance


Image from accelq

ACCELQ is AI-powered codeless API test automation and test management platform on the cloud. It helps to freely develop test requests without any concern about syntax. Some of its capabilities are:

  • Zero code API test automation
  • API Test Case Management, Test Planning, Execution
  • Test Design with Behavior Driven Scenario Designer
  • Test Planning and Management
  • External Test Reports portal
  • Cloud Hosting
  • Backup and Recovery

iCurlHTTP and HTTP request app

iCurlHTTP and HTTP request

iCurlHTTP and HTTP request app are applications that help you to compose and send HTTP requests from mobile devices to the development server. You can work with iCurlHTTP on IOS devices and the HTTP request app on android devices.

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