API Tester

Developer Tools | Updated May 30, 2026

Quickly test API endpoints directly in your browser. A lightweight tool for testing endpoints, debugging integrations, and validating request payloads.

Include Request Body

Status:

This browser-based API Tester provides a simple interface for interacting with HTTP endpoints. Send requests using common REST methods, submit JSON payloads, and review response data without relying on external applications.

Supported request methods include GET, POST, PUT, PATCH, and DELETE.

Response data is displayed in real time, helping developers quickly identify configuration issues, payload errors, and unexpected server responses.

API Tester FAQs

Answers to common questions about using the API Tester, supported request methods, status codes, and troubleshooting API requests

1. What is an API Tester?

An API Tester is a tool that allows you to send HTTP requests to an API endpoint and view the response. It helps developers validate endpoints, troubleshoot integrations, test request payloads, and verify how APIs behave under different conditions.
2. How do I use this API Tester?

Enter the API endpoint URL, select an HTTP method such as GET, POST, PUT, PATCH, or DELETE, and click Send Request. If the request requires data, enter a valid JSON payload in the request body field. The tool will display the response and status code.
3. What request methods are supported?

This API Tester supports the most common HTTP methods used by REST APIs: GET, POST, PUT, PATCH, DELETE

These methods allow you to retrieve, create, update, modify, and delete resources depending on the API you are testing.
4. Why is my API request failing?
API requests can fail for several reasons, including:
- Invalid endpoint URLs
- Authentication or authorization errors
- Incorrect request payloads
- Invalid JSON formatting
- Missing required parameters
- Server-side errors
- Browser security restrictions such as CORS
Review the returned status code and response message for more details.
5. Can I test authenticated APIs?

You can test publicly accessible APIs and endpoints that do not require custom authentication headers. APIs requiring API keys, OAuth tokens, or other authentication methods may require additional tools such as Postman, Insomnia, or custom development environments.
6. What do HTTP status codes mean?
HTTP status codes indicate the outcome of a request:
- 200 OK - Request succeeded
- 201 Created - Resource created successfully
- 400 Bad Request - Invalid request
- 401 Unauthorized - Authentication required
- 403 Forbidden - Access denied
- 404 Not Found - Resource not found
- 500 Internal Server Error - Server-side issue
These codes help identify whether a problem originates from the request or the server.
7. Why am I seeing a Network Error?
A Network Error typically means the browser could not complete the request. Common causes include:
- Invalid domains or URLs
- DNS issues
- SSL certificate problems
- Network connectivity issues
- Browser CORS restrictions
Checking the browser's developer console may provide additional details.
8. Are requests sent through your servers?

No. Requests are sent directly from your browser to the target endpoint whenever possible. This allows you to test APIs without routing traffic through third-party servers.
9. Is this API Tester a replacement for Postman?

This tool is designed for quick testing and troubleshooting. While it is convenient for validating endpoints and responses, advanced API platforms such as Postman offer additional features including collections, environments, automated testing, authentication management, and collaboration tools.

API Tester

API Tester FAQs

Need help making the right call?