Question 1

What is an API Tester Tool?

Accepted Answer

An API tester tool is a web-based application that allows developers to test REST API endpoints without installing any software. It enables you to send HTTP requests (GET, POST, PUT, DELETE, etc.) to API endpoints and view the responses in real-time. This tool is essential for debugging APIs, validating endpoints, and testing API integrations during development.

Question 2

How do I test a REST API online?

Accepted Answer

To test a REST API online using our tool:1. Enter your API endpoint URL in the URL field2. Select the HTTP method (GET, POST, PUT, DELETE, etc.)3. Add any required headers (Content-Type, Authorization, etc.)4. Add query parameters if needed5. For POST/PUT requests, add your JSON body6. Click 'Send' to execute the request7. View the response status, time, and data

Question 3

Can I test authenticated APIs?

Accepted Answer

Yes! Our API tester supports multiple authentication methods:• Bearer Token: Add your JWT or OAuth token in the Auth tab• Basic Authentication: Enter username and password• Custom Headers: Add API keys or custom auth headersSimply switch to the 'Auth' tab and select your preferred authentication method.

Question 4

How do I save my API requests?

Accepted Answer

You can save your API requests for later use by clicking the 'Save' button. Give your request a descriptive name, and it will be stored in your browser's local storage. You can access saved requests by clicking the 'History' button. Saved requests include the URL, method, headers, and body, making it easy to reuse common API calls.

Question 5

What HTTP methods are supported?

Accepted Answer

Our API tester supports all standard HTTP methods:• GET: Retrieve data from an API• POST: Create new resources• PUT: Update existing resources• PATCH: Partially update resources• DELETE: Remove resources• HEAD: Get headers only• OPTIONS: Check supported methods

Question 6

Is this API tester free to use?

Accepted Answer

Yes! Our online API testing tool is completely free to use with no registration required. You can test unlimited API endpoints, save requests to your browser, and access all features without any cost. Your data is stored locally in your browser, ensuring privacy and security.

Question 7

Can I test APIs with CORS restrictions?

Accepted Answer

CORS (Cross-Origin Resource Sharing) restrictions are browser security features. If you encounter CORS errors, it means the API server hasn't configured proper CORS headers. To test such APIs, you can:• Use browser extensions to bypass CORS (for testing only)• Ask the API provider to add CORS headers• Use a backend proxy server• Test from the API's same domain

Question 8

How accurate is the response time measurement?

Accepted Answer

Our API tester measures response time with millisecond precision using the browser's Performance API. The displayed time includes network latency, server processing time, and data transfer time. This helps you identify slow endpoints and optimize API performance. Note that actual response times may vary based on your internet connection and geographic location.

Free Online API Tester Tool

Request Headers

Response

Lightning Fast

Secure Testing

Request History

JSON Formatter

How to Use the API Tester

1. Enter API URL

2. Configure Request

3. Send Request

4. Analyze Response

Why Use Our Free Online API Testing Tool?

Key Features

Perfect For

Alternative to Postman

Frequently Asked Questions

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