Best Postman Alternatives for API Testing in 2023
15 Best Postman Alternatives (Free & Paid)
1. Katalon Platform
- API Test Creation: Katalon comes with many codeless test authoring capabilities, including Built-in Keywords, which are readily available code snippets that you can drag and drop to build a full test, and Record-and-Playback, which allows you to record the sequence of your activities, auto-capture test objects, and turn them into a test script.
- API Test Organization: all test objects captured are organized in a repository with clear hierarchy. These objects can be reused across a wide variety of environment and scenarios.
- API Test Execution: Katalon gives you access to many web and mobile environments to run your tests on. You can choose to run tests on cloud with Katalon TestCloud or run on your local environment through the CLI with Katalon Runtime Engine, which has many AI-powered features to support API test maintenance.
- API Test Analysis: after test runs, Katalon generates detailed reports with relevant metrics for you to monitor your efficiency and make data-driven decision.
- API Test Planning: integrate with Slack, Microsoft Teams, JIRA, and many collaboration platform for enhanced communication and visibility across teams
- Productive IDE for API test automation, providing code-support features, code inspection, snippets, quick references, dual interface, debugger, and test maintenance features
- Supports all types of SOAP/1.1, SOAP/1.2, REST, and GraphQL requests
- Versatile options for testers to work with their API project: Keyword-driven testing or Page Object Model (POM) testing.
- Tests can be imported from Swagger, WSDL, and Postman
- Support data-driven testing for better test coverage and efficiency
- Test artifacts can be reused across testing projects
- Diverse integration ecosystem supporting all stages of the STLC with native plugins for CI and DevOps best practices
- Data driven testing with multiple data sources (e.g. XLS, CSV) and databases supported. Katalon also supports BDD with Cucumber files and native Gherkin editor.
- Comprehensive reporting and test analytics
- Support a wider range of protocols, including HTTP, HTTPS, JMS, AMF, JDBC, and more
- Provides data-driven testing, which is not supported by Postman
- Detailed reporting and analytics capabilities in various formats
- Support the creation of automated functional tests to validate the behavior of SOAP, REST, and other web services
- Support command line interface
- Scripts can be reused across projects
- SOAPUI allows for the creation of mock services that simulate the behavior of a real service, allowing for testing in isolation.
- Requests and environments can be organized into workspace for better management
- Easy request chaining to build complex workflows
- Response content and headers are presented in an accessible format
- JSON responses are prettified and can be filtered for closer inspection
- Pre-built debugger to troubleshoot API requests
- Reusable code snippets
The Swagger Petstore is a sample API provided by Swagger/OpenAPI to showcase their capabilities. It is a RESTful API that manages pet data, allowing operations like creating, reading, updating, and deleting pets using HTTP methods such as GET, POST, PUT, and DELETE.
- Powerful API Design toolset
- API mocking to simulate the API behavior before it is built, which is useful for early API testing or prototyping
- Swagger can be seamlessly integrated into the CI/CD pipeline
- Swagger Codegen can generate server stubs and client SDKs for any API
- Swagger UI is highly customizable to tailor the API documentation to the testers’ specific needs
- Collaboration features for teams
- Support multiple API specs, including OpenAI, Swagger 2.0, and RAML
To test APIs using JMeter, you need to set up a Test Plan in JMeter. This involves adding a Thread Group, which determines the number of virtual users and how they are distributed over time, and an HTTP Request, which specifies the details of the API request such as the server, path, method, parameters, and headers. Optional assertions can be added to validate the response.
Once the Test Plan is configured, you can run the test and monitor the results using JMeter's listeners. By adding multiple Thread Groups and HTTP Requests, you can create more complex test scenarios. Remember to save your Test Plan and ensure that you have the necessary dependencies and plugins for your API protocols and authentication mechanisms.
- Full-featured IDE allowing teams to record interactions with web browsers and/or native apps using the HTTP(S) Test Script Recorder
- Effortlessly build, customize, and debug test plan on a well-designed UI
- Offers a Command Line Interface (CLI) allowing testers to run automated API tests in a headless mode
- Automatically identifies and extracts dynamic values from many data formats (HTML, JSON, XML, and stores them in variables
- Dashboard for visualization, aggregate and raw data report generation
- Codeless API test creation
- End-to-end test automation for both API and UI testing
- Easy integration with Dev and QA toolchain
- Low-code API functional, security, and performance testing
- Support a wide range of API type, including SOAP, REST, and cutting-edge use cases levering MQTT
- Point-and-click assertion logic insertion
- Diverse integrations for continuous integration and deployment
- Comprehensive reporting and analytics with up-to-date testing metrics, exportable as JUnit-style HTML reports, CSV, and more
- Formatted and colorized terminal output, which can be customized to include/exclude certain detail
- Built-in JSON support
- Forms and files uploads
- Arbitrary request data
- Custom headers
- Persistent sessions
- Wget-like downloads
- Linux, macOS, Windows, and FreeBSD support
- Support dynamic variables, conditional logic, and webhooks, making it easy to test complex API workflows
- Run automated tests as part of your continuous integration and delivery pipeline
- Codeless API monitoring allows testers with minimal coding experience to test APIs, manage schedules, and check up on web service failures
- Real-time alerts via emails, SMS, or Slack when your API fails
- Collaborated API testing and monitoring
- Comprehensive reporting on API performance, response rate, error time, and more
- Integration with GitHub, Slack, Zapier, and more
- OpenAPI support
- Free, lightweight, and immediately accessible - no need to create an account
- Clean interface to quickly create, test, and debug API requests
- Real-time request/response data
- Support a wide range of HTTP request types, including GET, POST, PUT, DELETE, PATCH, and OPTIONS
- Customizable headers and parameters to test many different scenarios
- JSON and form data support
- Automatic response validation based on the expected status codes and data formats
- Request organization into collections for easier management
- Code snippets
- Request import/export functionality
- Actively developed and maintained
- Highly compatible with macOS
- Full-featured visual editor and HTTP toolset
- Support JSON schema and is fully compliant with Swagger and RAML descriptions
- Support both OAuth 1.0 and 2.0
- Built-in mock server
- Automatically generate API documentation from API requests
12. Karate Labs
- Low learning curve
- Native support for Gherkin syntax
- Built-in HTTP client that can be used to make REST API requests without the need for additional libraries or tools
- Highly extensible with custom Java code
13. Tricentis Tosca
- End-to-end API testing across a wide range of environments
- Automatically generate test cases from API documentation
- Scriptless test creation for reduced learning curve, higher clarity, transparency, and enhance collaboration
- Extensive API testing capabilities, supporting popular protocols and formats
- Scalable along with your API testing projects
- Automatically analyzes the captured requests and responses, extracts the relevant data, and converts them into business-readable test cases that accurately represent the API's behavior
- InstaPlay Recorder to easily create web and API load tests in minutes, no coding required
- Browser-based UI for building complex API scenarios for accurate results
- Cloud-based API Load Testing
- Integrated performance metrics for actionable insights and root cause analysis
- Integration into any CI/CD pipeline
- Support multiple programming languages and frameworks to perform API testing
- Security and access control to protect sensitive data from unauthorized access.
- Real-time analytics
- Third-party tool integrations
- Automatic scaling, load balancing, and failover, ensuring that APIs are always available and responsive.
How To Select The Right Postman Alernative
When selecting the right alternative to Postman, there are a few factors to consider. You need to carefully evaluate the specific needs of your API testing and development workflow to determine if you require features like automated testing, collaboration capabilities, CI/CD integration, or advanced reporting. Next, we can consider the ease of use and learning curve associated with the alternative tool. Look for a tool that offers a user-friendly interface and intuitive navigation. Compatibility with various platforms, operating systems, and API protocols is also extremely crucial for seamless integration into your existing tech stack.
Most importantly, it is about understanding the strong and weak points of Postman, then compare them with your tool of consideration.
Postman works on all major platforms, including Windows, macOS, and Linux. Individual developers can use Postman’s free version for their basic and simple requirements, and businesses can look for more in their commercial versions. Now identified as a collaboration platform for API development, the tool aims to simplify building an API and streamline team collaboration to make APIs creation better and faster.
The Advantages Of Postman
- Ease of use: A new user to Postman only has to sign up, download the tool, and log in to their account to get started
- Simplified API: Postman users can begin their API journey quickly and effectively using Postman’s comprehensive platform and wide support for all possible HTTP methods.
- Robust testing capabilities: Postman supports multiple testing environments, test checkpoints, and scheduling options.
- Integration and collaboration: Postman Workspace is dedicated to real-time collaboration between teams with built-in version control. The tool integration ecosystem is growing, with major names constantly being added.
The Limitations Of Postman
Although Postman has proven its capabilities in providing a holistic experience for developers to perform testing with their web services, it still falls short in several criteria. Most significantly, Postman is ideal for manual testing needs while the world is turning its focus more toward continuous testing tools.
Here’s a closer look at Postman’s limitations for automated testing demands:
- Postman is not built for automated test validation, making it hard to ensure stability in performance.
- Reporting is only available in Enterprise plan
- Low script reusability leading to duplicate effort for any new API testing project
- Lack of test maintenance features
- It lacks support for CI/CD integrations and shift-left or Agile processes to meet QA teams’ demand since it was originally designed as a standalone tool for developers and testers, rather than as part of a larger DevOps toolchain