Developer ToolsFree Tool

API Testing Tool

Provided byNewtumnewtum.com

Send HTTP requests, inspect responses, and debug API integrations directly in the browser.

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Screenshot of API Testing Tool on Newtum
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About this tool

What API Testing Tool does

The API Testing Tool on Newtum is a browser-based utility that lets developers send HTTP requests and inspect responses without installing software. Users can test REST and SOAP endpoints by entering an API URL, selecting a request method, and adding headers or body data. The platform returns structured results including status codes, response headers, and body content, enabling immediate debugging of API integrations. It also offers response beautification, validation, and code generation in multiple languages, all within the same interface.

Step by step

How to use the Newtum API Testing Tool

  1. 1

    Enter your API endpoint URL in the provided field

  2. 2

    Select the request method (GET, POST, PUT, DELETE) and add any required headers or body parameters

  3. 3

    Click the Send button to execute the request and view the response

  4. 4

    Review the returned status code, headers, and body content, or use the code generation feature to export snippets in Python, PHP, JavaScript, cURL, or more

Is it right for you

Best for

Developers and QA teams who need to quickly test API endpoints, validate responses, or generate code snippets without leaving their browser or setting up local testing environments.

Limitations

  • No unit switching between metric and imperial units
  • Results are estimates based on the specific endpoint tested
  • May require manual configuration of headers for authenticated or complex requests
Questions

API Testing Tool FAQ

Do I need to install any software to use the API Testing Tool?
No, the tool runs entirely in your browser. There are no installations or CORS issues to manage, as requests are processed directly within the Newtum interface.
Can I test both REST and SOAP APIs with this tool?
Yes, the platform supports building and sending requests for both REST and SOAP endpoints, allowing users to test a wide variety of API types from a single interface.
What types of response formatting options are available?
The tool includes features to beautify, validate, and explore JSON and XML responses instantly, making it easier to read and debug the data returned from API calls.
Is it possible to share API requests with teammates?
Yes, the tool is collaboration-ready; users can share requests with their team using a simple URL, facilitating team-based testing and project organization.
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